# Online Tools Forge

> 1000 free, privacy-first online tools that run entirely in the browser — no signup, no server processing, nothing stored. Developer utilities, text processing, converters, generators, image tools, security, calculators, and more. English and Thai.

## ภาษาไทย

เครื่องมือออนไลน์ฟรี 1000 รายการ ทำงานทั้งหมดในเบราว์เซอร์ ไม่ต้องสมัคร ไม่ส่งข้อมูลไปเซิร์ฟเวอร์ รายการทั้งหมด (ภาษาไทย): https://onlinetoolsforge.com/th/tools/ — บล็อกและคู่มือ: https://onlinetoolsforge.com/th/blog/

## Highlights

- [nfc tag reader writer](https://onlinetoolsforge.com/en/tools/nfc-tag-reader-writer/): Read and write NFC tags directly from browser. Create smart business cards, automation triggers, and launch URLs using Web NFC API.
- [click speed tester](https://onlinetoolsforge.com/en/tools/click-speed-tester/): Test your mouse clicking speed and accuracy with this interactive CPS tester
- [text to emoji converter](https://onlinetoolsforge.com/en/tools/text-to-emoji-converter/): Convert text to emoji representations. Transform words and sentences into expressive emoji sequences for fun social media posts.
- [number to words converter](https://onlinetoolsforge.com/en/tools/number-to-words-converter/): Convert numerical values into written words (e.g., for cheques or legal documents). Supports multiple languages and currency formats.
- [usb device info viewer](https://onlinetoolsforge.com/en/tools/usb-device-info-viewer/): Display connected USB devices using WebUSB API. View vendor IDs, product IDs, device capabilities, and connection information.
- [meta length checker](https://onlinetoolsforge.com/en/tools/meta-length-checker/): meta length checker — free online tool, runs in your browser
- [pantone color converter](https://onlinetoolsforge.com/en/tools/pantone-color-converter/): Convert colors between PANTONE, HEX, RGB, CMYK, HSL, and HSV formats. Find the closest PANTONE match for any color with comprehensive color information.
- [zero width space detector](https://onlinetoolsforge.com/en/tools/zero-width-space-detector/): Detect and remove zero-width characters from text. Find invisible spaces, non-breaking spaces, and other hidden characters that can cause issues in code and documents.
- [file size calculator](https://onlinetoolsforge.com/en/tools/file-size-calculator/): file size calculator — free online tool, runs in your browser
- [favicon previewer](https://onlinetoolsforge.com/en/tools/favicon-previewer/): Preview how your favicon looks in browser tabs, bookmarks, and mobile devices. Test favicon visibility across platforms.
- [openapi validator](https://onlinetoolsforge.com/en/tools/openapi-validator/): Validate OpenAPI 3.x and Swagger 2.0 specifications. Check schemas, references, security definitions, and best practices.
- [css grid generator](https://onlinetoolsforge.com/en/tools/css-grid-generator/): css grid generator — free online tool, runs in your browser

## Categories

- [Developer tools](https://onlinetoolsforge.com/en/tools/categories/developer/): 212 tools
- [Generator tools](https://onlinetoolsforge.com/en/tools/categories/generator/): 114 tools
- [Converter tools](https://onlinetoolsforge.com/en/tools/categories/converter/): 145 tools
- [Text tools](https://onlinetoolsforge.com/en/tools/categories/text/): 61 tools
- [Image tools](https://onlinetoolsforge.com/en/tools/categories/image/): 44 tools
- [Security tools](https://onlinetoolsforge.com/en/tools/categories/security/): 64 tools
- [Calculator tools](https://onlinetoolsforge.com/en/tools/categories/calculator/): 123 tools
- [Seo tools](https://onlinetoolsforge.com/en/tools/categories/seo/): 25 tools
- [Network tools](https://onlinetoolsforge.com/en/tools/categories/network/): 21 tools
- [File tools](https://onlinetoolsforge.com/en/tools/categories/file/): 31 tools
- [Testing tools](https://onlinetoolsforge.com/en/tools/categories/testing/): 4 tools
- [Database tools](https://onlinetoolsforge.com/en/tools/categories/database/): 10 tools
- [Financial tools](https://onlinetoolsforge.com/en/tools/categories/financial/): 68 tools
- [Ai tools](https://onlinetoolsforge.com/en/tools/categories/ai/): 11 tools
- [Productivity tools](https://onlinetoolsforge.com/en/tools/categories/productivity/): 34 tools
- [Hardware tools](https://onlinetoolsforge.com/en/tools/categories/hardware/): 24 tools
- [Accessibility tools](https://onlinetoolsforge.com/en/tools/categories/accessibility/): 9 tools

## Tool pages

Every tool lives at `/en/tools/<slug>/` (Thai: `/th/tools/<slug>/`) and works fully client-side. Full list:

- [lottery number generator](https://onlinetoolsforge.com/en/tools/lottery-number-generator/): Free online lottery number generator. Create random tickets for Powerball, Mega Millions, EuroMillions, EuroJackpot, UK Lotto, and Thai Government Lottery, plus a fully custom mode. Fair randomness via the Web Crypto API. 100% client-side.
- [coin flipper](https://onlinetoolsforge.com/en/tools/coin-flipper/): Free online coin flipper. Flip a virtual coin with a 3D animation, flip up to 100,000 coins at once, and track heads/tails counts, distribution, streaks, and history. Uses the Web Crypto API for fair randomness. 100% client-side.
- [list delimiter converter](https://onlinetoolsforge.com/en/tools/list-delimiter-converter/): Free online list delimiter converter. Convert lists between comma, newline, tab, pipe, semicolon, space, and custom separators. Auto-detect, deduplicate, sort, and trim. 100% client-side.
- [comma separator](https://onlinetoolsforge.com/en/tools/comma-separator/): Free online comma separator tool. Add or remove thousands separators from any number in an instant. Supports comma, space, dot, underscore, and apostrophe separators, custom decimal precision, and batch formatting. 100% client-side.
- [connection string parser](https://onlinetoolsforge.com/en/tools/connection-string-parser/): Parse database connection strings (PostgreSQL, MySQL, MongoDB, Redis, SQL Server) into scheme, username, password, host, port, database, and options — then edit fields and rebuild the string. 100% client-side.
- [random word generator](https://onlinetoolsforge.com/en/tools/random-word-generator/): Free random word generator with 400+ words across 11 categories including Pictionary, Charades, animals, food, and more. Adjustable difficulty, count, and filters. 100% client-side.
- [email extractor](https://onlinetoolsforge.com/en/tools/email-extractor/) — free online tool, runs in your browser
- [svg to jsx converter](https://onlinetoolsforge.com/en/tools/svg-to-jsx-converter/) — free online tool, runs in your browser
- [html to jsx converter](https://onlinetoolsforge.com/en/tools/html-to-jsx-converter/) — free online tool, runs in your browser
- [reading time calculator](https://onlinetoolsforge.com/en/tools/reading-time-calculator/): Free online reading time calculator. Estimate how long an article or script takes to read or speak, with adjustable words-per-minute, page count, and a Flesch Reading Ease score. 100% client-side.
- [bmr tdee calculator](https://onlinetoolsforge.com/en/tools/bmr-tdee-calculator/): Free online BMR & TDEE calculator. Estimate your Basal Metabolic Rate (Mifflin-St Jeor) and Total Daily Energy Expenditure with 5 activity levels, calorie targets for weight goals, and a macro split. 100% client-side.
- [electricity cost calculator](https://onlinetoolsforge.com/en/tools/electricity-cost-calculator/): Free online electricity cost calculator. Estimate how much any appliance costs to run per day, month, and year based on its wattage, daily usage, and your electricity rate. Includes appliance presets and supports any currency. 100% client-side.
- [word counter](https://onlinetoolsforge.com/en/tools/word-counter/) — free online tool, runs in your browser
- [unit converter](https://onlinetoolsforge.com/en/tools/unit-converter/) — free online tool, runs in your browser
- [quadratic equation solver](https://onlinetoolsforge.com/en/tools/quadratic-equation-solver/): Free quadratic equation solver for ax² + bx + c = 0. Instantly finds real and complex roots, the discriminant, vertex, and axis of symmetry, with step-by-step solutions and a parabola graph. 100% client-side.
- [qr generator](https://onlinetoolsforge.com/en/tools/qr-generator/) — free online tool, runs in your browser
- [meme generator](https://onlinetoolsforge.com/en/tools/meme-generator/) — free online tool, runs in your browser
- [wifi qr code generator](https://onlinetoolsforge.com/en/tools/wifi-qr-code-generator/) — free online tool, runs in your browser
- [vcard qr generator](https://onlinetoolsforge.com/en/tools/vcard-qr-generator/): Generate vCard and MeCard QR codes to share your contact info by scanning with any phone camera. Supports name, phone, email, website, address, and more — 100% in-browser.
- [ppi calculator](https://onlinetoolsforge.com/en/tools/ppi-calculator/): Calculate screen pixels per inch (PPI), dot pitch, and total pixels from resolution and diagonal size. Supports inch and cm input — 100% in-browser.
- [qr code decoder](https://onlinetoolsforge.com/en/tools/qr-code-decoder/) — free online tool, runs in your browser
- [password generator](https://onlinetoolsforge.com/en/tools/password-generator/) — free online tool, runs in your browser
- [text repeater](https://onlinetoolsforge.com/en/tools/text-repeater/): Repeat any text, emoji, or sentence multiple times with custom separators. Free, fast, and works fully in your browser — perfect for social media, bulk content, and testing.
- [text case converter](https://onlinetoolsforge.com/en/tools/text-case-converter/) — free online tool, runs in your browser
- [timezone converter](https://onlinetoolsforge.com/en/tools/timezone-converter/) — free online tool, runs in your browser
- [json formatter](https://onlinetoolsforge.com/en/tools/json-formatter/) — free online tool, runs in your browser
- [markdown preview](https://onlinetoolsforge.com/en/tools/markdown-preview/) — free online tool, runs in your browser
- [find and replace](https://onlinetoolsforge.com/en/tools/find-and-replace/): Free online find and replace tool. Search text and replace every occurrence instantly with case-sensitive, whole-word, and regular expression modes. Live match count and preview. 100% client-side.
- [base64 tool](https://onlinetoolsforge.com/en/tools/base64-tool/) — free online tool, runs in your browser
- [hash generator](https://onlinetoolsforge.com/en/tools/hash-generator/) — free online tool, runs in your browser
- [lorem generator](https://onlinetoolsforge.com/en/tools/lorem-generator/) — free online tool, runs in your browser
- [text comparator](https://onlinetoolsforge.com/en/tools/text-comparator/) — free online tool, runs in your browser
- [url encoder](https://onlinetoolsforge.com/en/tools/url-encoder/) — free online tool, runs in your browser
- [color converter](https://onlinetoolsforge.com/en/tools/color-converter/) — free online tool, runs in your browser
- [uuid generator](https://onlinetoolsforge.com/en/tools/uuid-generator/) — free online tool, runs in your browser
- [ulid generator](https://onlinetoolsforge.com/en/tools/ulid-generator/) — free online tool, runs in your browser
- [nanoid generator](https://onlinetoolsforge.com/en/tools/nanoid-generator/): Generate NanoIDs online — small, secure, URL-friendly unique IDs. Customize size (1-100 chars) and character set, generate up to 100 at once. No signup, fully client-side.
- [regex tester](https://onlinetoolsforge.com/en/tools/regex-tester/) — free online tool, runs in your browser
- [base converter](https://onlinetoolsforge.com/en/tools/base-converter/) — free online tool, runs in your browser
- [html encoder](https://onlinetoolsforge.com/en/tools/html-encoder/) — free online tool, runs in your browser
- [css formatter](https://onlinetoolsforge.com/en/tools/css-formatter/) — free online tool, runs in your browser
- [diceware passphrase generator](https://onlinetoolsforge.com/en/tools/diceware-passphrase-generator/): Generate memorable high-entropy passphrases from the EFF 7,776-word list using crypto-secure randomness or your own physical dice rolls, with entropy and crack-time estimates. Runs entirely in your browser.
- [dice roller](https://onlinetoolsforge.com/en/tools/dice-roller/): Roll virtual dice and flip coins with realistic animations. Perfect for board games, decision making, and probability experiments.
- [random number generator](https://onlinetoolsforge.com/en/tools/random-number-generator/) — free online tool, runs in your browser
- [unix timestamp converter](https://onlinetoolsforge.com/en/tools/unix-timestamp-converter/) — free online tool, runs in your browser
- [jwt decoder](https://onlinetoolsforge.com/en/tools/jwt-decoder/) — free online tool, runs in your browser
- [password strength checker](https://onlinetoolsforge.com/en/tools/password-strength-checker/) — free online tool, runs in your browser
- [line sorter](https://onlinetoolsforge.com/en/tools/line-sorter/) — free online tool, runs in your browser
- [duplicate line remover](https://onlinetoolsforge.com/en/tools/duplicate-line-remover/) — free online tool, runs in your browser
- [markdown toc generator](https://onlinetoolsforge.com/en/tools/markdown-toc-generator/): Generate a table of contents from Markdown with GitHub-, GitLab-, or Pandoc-style heading anchors and configurable depth.
- [line shuffler](https://onlinetoolsforge.com/en/tools/line-shuffler/): Randomly shuffle and randomize the order of lines in a list. Optional seeded shuffle for reproducible output, dedup, and empty-line removal.
- [text column extractor](https://onlinetoolsforge.com/en/tools/text-column-extractor/): Extract a specific column from column-aligned or delimited text by index or delimiter. Supports CSV, TSV, pipe, space, and custom separators with live preview.
- [sql formatter](https://onlinetoolsforge.com/en/tools/sql-formatter/) — free online tool, runs in your browser
- [slug generator](https://onlinetoolsforge.com/en/tools/slug-generator/) — free online tool, runs in your browser
- [image compressor](https://onlinetoolsforge.com/en/tools/image-compressor/) — free online tool, runs in your browser
- [image resizer](https://onlinetoolsforge.com/en/tools/image-resizer/) — free online tool, runs in your browser
- [image format converter](https://onlinetoolsforge.com/en/tools/image-format-converter/) — free online tool, runs in your browser
- [favicon generator](https://onlinetoolsforge.com/en/tools/favicon-generator/) — free online tool, runs in your browser
- [csv json converter](https://onlinetoolsforge.com/en/tools/csv-json-converter/) — free online tool, runs in your browser
- [xml json converter](https://onlinetoolsforge.com/en/tools/xml-json-converter/) — free online tool, runs in your browser
- [date calculator](https://onlinetoolsforge.com/en/tools/date-calculator/) — free online tool, runs in your browser
- [ip lookup](https://onlinetoolsforge.com/en/tools/ip-lookup/) — free online tool, runs in your browser
- [cron parser](https://onlinetoolsforge.com/en/tools/cron-parser/) — free online tool, runs in your browser
- [meta tags generator](https://onlinetoolsforge.com/en/tools/meta-tags-generator/) — free online tool, runs in your browser
- [robots txt generator](https://onlinetoolsforge.com/en/tools/robots-txt-generator/) — free online tool, runs in your browser
- [robots txt tester](https://onlinetoolsforge.com/en/tools/robots-txt-tester/): Test which user-agents can crawl a URL against pasted robots.txt rules with Allow/Disallow verdicts, wildcard matching, and directive warnings.
- [http status lookup](https://onlinetoolsforge.com/en/tools/http-status-lookup/) — free online tool, runs in your browser
- [email validator](https://onlinetoolsforge.com/en/tools/email-validator/) — free online tool, runs in your browser
- [yaml formatter](https://onlinetoolsforge.com/en/tools/yaml-formatter/) — free online tool, runs in your browser
- [diff checker](https://onlinetoolsforge.com/en/tools/diff-checker/) — free online tool, runs in your browser
- [code minifier](https://onlinetoolsforge.com/en/tools/code-minifier/) — free online tool, runs in your browser
- [user agent parser](https://onlinetoolsforge.com/en/tools/user-agent-parser/) — free online tool, runs in your browser
- [css grid generator](https://onlinetoolsforge.com/en/tools/css-grid-generator/) — free online tool, runs in your browser
- [box shadow generator](https://onlinetoolsforge.com/en/tools/box-shadow-generator/) — free online tool, runs in your browser
- [css backdrop filter generator](https://onlinetoolsforge.com/en/tools/css-backdrop-filter-generator/): Build CSS backdrop-filter rules (blur, brightness, contrast, hue-rotate, saturate) with live frosted-glass preview.
- [gradient generator](https://onlinetoolsforge.com/en/tools/gradient-generator/) — free online tool, runs in your browser
- [gradient stops editor](https://onlinetoolsforge.com/en/tools/gradient-stops-editor/): Edit multi-stop CSS gradients with position sliders, reordering, conic and repeating gradients.
- [markdown to slack converter](https://onlinetoolsforge.com/en/tools/markdown-to-slack-converter/): Convert Markdown formatting into Slack mrkdwn for clean copy-paste into messages.
- [markdown to whatsapp converter](https://onlinetoolsforge.com/en/tools/markdown-to-whatsapp-converter/): Convert Markdown formatting to WhatsApp *bold*, _italic_, ~strikethrough~, and monospace syntax for clean chat pasting.
- [markdown to html converter](https://onlinetoolsforge.com/en/tools/markdown-to-html-converter/) — free online tool, runs in your browser
- [html to markdown converter](https://onlinetoolsforge.com/en/tools/html-to-markdown-converter/) — free online tool, runs in your browser
- [html tag remover](https://onlinetoolsforge.com/en/tools/html-tag-remover/): Strip HTML tags and extract clean plain text from any HTML markup. Free online HTML tag remover that decodes entities, preserves line breaks, and removes scripts — 100% in your browser.
- [json to csv converter](https://onlinetoolsforge.com/en/tools/json-to-csv-converter/) — free online tool, runs in your browser
- [percentage calculator](https://onlinetoolsforge.com/en/tools/percentage-calculator/) — free online tool, runs in your browser
- [loan calculator](https://onlinetoolsforge.com/en/tools/loan-calculator/) — free online tool, runs in your browser
- [net worth calculator](https://onlinetoolsforge.com/en/tools/net-worth-calculator/): Calculate your net worth by tracking assets and liabilities. Get a clear picture of your financial health with real-time totals and ratios.
- [currency converter](https://onlinetoolsforge.com/en/tools/currency-converter/) — free online tool, runs in your browser
- [compound interest calculator](https://onlinetoolsforge.com/en/tools/compound-interest-calculator/) — free online tool, runs in your browser
- [dca calculator](https://onlinetoolsforge.com/en/tools/dca-calculator/): Calculate dollar-cost averaging (DCA) investment results from periodic contributions and price history. See total invested, average cost, final value, and ROI.
- [retirement calculator](https://onlinetoolsforge.com/en/tools/retirement-calculator/): Project your retirement savings and safe withdrawal income from age, current savings, monthly contributions, and expected return. See inflation-adjusted numbers and a year-by-year growth table.
- [tip calculator](https://onlinetoolsforge.com/en/tools/tip-calculator/) — free online tool, runs in your browser
- [bmi calculator](https://onlinetoolsforge.com/en/tools/bmi-calculator/) — free online tool, runs in your browser
- [heart rate zone calculator](https://onlinetoolsforge.com/en/tools/heart-rate-zone-calculator/): Calculate training heart rate zones from your age and resting pulse. Shows 5 zones with bpm ranges using percent-of-max-HR and Karvonen (heart rate reserve) methods.
- [totp generator](https://onlinetoolsforge.com/en/tools/totp-generator/): Generate TOTP 2FA codes and QR codes for authenticator apps. Supports otpauth:// URIs, multiple accounts, and backup export. 100% client-side using Web Crypto API.
- [text encryptor](https://onlinetoolsforge.com/en/tools/text-encryptor/) — free online tool, runs in your browser
- [htaccess generator](https://onlinetoolsforge.com/en/tools/htaccess-generator/) — free online tool, runs in your browser
- [csp generator](https://onlinetoolsforge.com/en/tools/csp-generator/) — free online tool, runs in your browser
- [sri hash generator](https://onlinetoolsforge.com/en/tools/sri-hash-generator/) — free online tool, runs in your browser
- [open graph generator](https://onlinetoolsforge.com/en/tools/open-graph-generator/) — free online tool, runs in your browser
- [privacy policy generator](https://onlinetoolsforge.com/en/tools/privacy-policy-generator/) — free online tool, runs in your browser
- [border radius generator](https://onlinetoolsforge.com/en/tools/border-radius-generator/) — free online tool, runs in your browser
- [text shadow generator](https://onlinetoolsforge.com/en/tools/text-shadow-generator/) — free online tool, runs in your browser
- [css animation generator](https://onlinetoolsforge.com/en/tools/css-animation-generator/) — free online tool, runs in your browser
- [flexbox generator](https://onlinetoolsforge.com/en/tools/flexbox-generator/) — free online tool, runs in your browser
- [button generator](https://onlinetoolsforge.com/en/tools/button-generator/) — free online tool, runs in your browser
- [css transform generator](https://onlinetoolsforge.com/en/tools/css-transform-generator/) — free online tool, runs in your browser
- [sitemap generator](https://onlinetoolsforge.com/en/tools/sitemap-generator/) — free online tool, runs in your browser
- [placeholder image generator](https://onlinetoolsforge.com/en/tools/placeholder-image-generator/) — free online tool, runs in your browser
- [svg optimizer](https://onlinetoolsforge.com/en/tools/svg-optimizer/) — free online tool, runs in your browser
- [svg path editor](https://onlinetoolsforge.com/en/tools/svg-path-editor/): Visually edit SVG path d attribute data with a live preview. Drag anchor and control points, snap to grid, and copy optimized path output. Free online SVG path editor.
- [lorem picsum generator](https://onlinetoolsforge.com/en/tools/lorem-picsum-generator/) — free online tool, runs in your browser
- [chart generator](https://onlinetoolsforge.com/en/tools/chart-generator/): Create bar, line, pie, doughnut, and area charts from CSV or JSON data. Customize colors, export as PNG or SVG. Free online chart generator.
- [table generator](https://onlinetoolsforge.com/en/tools/table-generator/) — free online tool, runs in your browser
- [emoji picker](https://onlinetoolsforge.com/en/tools/emoji-picker/) — free online tool, runs in your browser
- [ascii art generator](https://onlinetoolsforge.com/en/tools/ascii-art-generator/) — free online tool, runs in your browser
- [rsa key generator](https://onlinetoolsforge.com/en/tools/rsa-key-generator/): Generate RSA public/private key pairs in-browser via the Web Crypto API.
- [jwt generator](https://onlinetoolsforge.com/en/tools/jwt-generator/) — free online tool, runs in your browser
- [jwk to pem converter](https://onlinetoolsforge.com/en/tools/jwk-to-pem-converter/): Convert JSON Web Keys (JWK) to PEM format and back using the Web Crypto API. Supports RSA, EC, and Ed25519 keys.
- [regex pattern library](https://onlinetoolsforge.com/en/tools/regex-pattern-library/) — free online tool, runs in your browser
- [text statistics](https://onlinetoolsforge.com/en/tools/text-statistics/) — free online tool, runs in your browser
- [color palette generator](https://onlinetoolsforge.com/en/tools/color-palette-generator/) — free online tool, runs in your browser
- [color scheme generator](https://onlinetoolsforge.com/en/tools/color-scheme-generator/) — free online tool, runs in your browser
- [mime type lookup](https://onlinetoolsforge.com/en/tools/mime-type-lookup/) — free online tool, runs in your browser
- [cron expression builder](https://onlinetoolsforge.com/en/tools/cron-expression-builder/) — free online tool, runs in your browser
- [mock data generator](https://onlinetoolsforge.com/en/tools/mock-data-generator/) — free online tool, runs in your browser
- [coupon code generator](https://onlinetoolsforge.com/en/tools/coupon-code-generator/) — free online tool, runs in your browser
- [json to yaml converter](https://onlinetoolsforge.com/en/tools/json-to-yaml-converter/) — free online tool, runs in your browser
- [json to toml converter](https://onlinetoolsforge.com/en/tools/json-to-toml-converter/) — free online tool, runs in your browser
- [json to toon converter](https://onlinetoolsforge.com/en/tools/json-to-toon-converter/) — free online tool, runs in your browser
- [hex to rgb converter](https://onlinetoolsforge.com/en/tools/hex-to-rgb-converter/) — free online tool, runs in your browser
- [text reverser](https://onlinetoolsforge.com/en/tools/text-reverser/) — free online tool, runs in your browser
- [character counter](https://onlinetoolsforge.com/en/tools/character-counter/) — free online tool, runs in your browser
- [json to xml converter](https://onlinetoolsforge.com/en/tools/json-to-xml-converter/) — free online tool, runs in your browser
- [code beautifier](https://onlinetoolsforge.com/en/tools/code-beautifier/) — free online tool, runs in your browser
- [css clippath generator](https://onlinetoolsforge.com/en/tools/css-clippath-generator/) — free online tool, runs in your browser
- [css filter generator](https://onlinetoolsforge.com/en/tools/css-filter-generator/) — free online tool, runs in your browser
- [markdown table generator](https://onlinetoolsforge.com/en/tools/markdown-table-generator/) — free online tool, runs in your browser
- [text to image converter](https://onlinetoolsforge.com/en/tools/text-to-image-converter/) — free online tool, runs in your browser
- [image cropper](https://onlinetoolsforge.com/en/tools/image-cropper/) — free online tool, runs in your browser
- [api response formatter](https://onlinetoolsforge.com/en/tools/api-response-formatter/) — free online tool, runs in your browser
- [structured data generator](https://onlinetoolsforge.com/en/tools/structured-data-generator/) — free online tool, runs in your browser
- [ssl certificate checker](https://onlinetoolsforge.com/en/tools/ssl-certificate-checker/) — free online tool, runs in your browser
- [image to base64 converter](https://onlinetoolsforge.com/en/tools/image-to-base64-converter/) — free online tool, runs in your browser
- [image to text converter](https://onlinetoolsforge.com/en/tools/image-to-text-converter/) — free online tool, runs in your browser
- [svg pattern generator](https://onlinetoolsforge.com/en/tools/svg-pattern-generator/) — free online tool, runs in your browser
- [image format batch converter](https://onlinetoolsforge.com/en/tools/image-format-batch-converter/) — free online tool, runs in your browser
- [image filter effects](https://onlinetoolsforge.com/en/tools/image-filter-effects/) — free online tool, runs in your browser
- [watermark generator](https://onlinetoolsforge.com/en/tools/watermark-generator/) — free online tool, runs in your browser
- [svg to ico converter](https://onlinetoolsforge.com/en/tools/svg-to-ico-converter/) — free online tool, runs in your browser
- [svg preview](https://onlinetoolsforge.com/en/tools/svg-preview/) — free online tool, runs in your browser
- [grade calculator](https://onlinetoolsforge.com/en/tools/grade-calculator/): Calculate your weighted course grade from assignments and exams, or find the score you need on your final exam to reach a target grade. Includes letter grade and GPA conversion on the 4.0 scale. Free, fast, and works entirely in your browser.
- [age calculator](https://onlinetoolsforge.com/en/tools/age-calculator/) — free online tool, runs in your browser
- [file size calculator](https://onlinetoolsforge.com/en/tools/file-size-calculator/) — free online tool, runs in your browser
- [aspect ratio calculator](https://onlinetoolsforge.com/en/tools/aspect-ratio-calculator/) — free online tool, runs in your browser
- [twitter card generator](https://onlinetoolsforge.com/en/tools/twitter-card-generator/) — free online tool, runs in your browser
- [canonical url generator](https://onlinetoolsforge.com/en/tools/canonical-url-generator/) — free online tool, runs in your browser
- [password hash verifier](https://onlinetoolsforge.com/en/tools/password-hash-verifier/) — free online tool, runs in your browser
- [cors header generator](https://onlinetoolsforge.com/en/tools/cors-header-generator/) — free online tool, runs in your browser
- [css specificity calculator](https://onlinetoolsforge.com/en/tools/css-specificity-calculator/) — free online tool, runs in your browser
- [csv to sql converter](https://onlinetoolsforge.com/en/tools/csv-to-sql-converter/) — free online tool, runs in your browser
- [data sanitizer](https://onlinetoolsforge.com/en/tools/data-sanitizer/) — free online tool, runs in your browser
- [json schema validator](https://onlinetoolsforge.com/en/tools/json-schema-validator/) — free online tool, runs in your browser
- [xml validator](https://onlinetoolsforge.com/en/tools/xml-validator/) — free online tool, runs in your browser
- [markdown to pdf converter](https://onlinetoolsforge.com/en/tools/markdown-to-pdf-converter/) — free online tool, runs in your browser
- [pdf to text extractor](https://onlinetoolsforge.com/en/tools/pdf-to-text-extractor/) — free online tool, runs in your browser
- [html to pdf converter](https://onlinetoolsforge.com/en/tools/html-to-pdf-converter/) — free online tool, runs in your browser
- [image background remover](https://onlinetoolsforge.com/en/tools/image-background-remover/) — free online tool, runs in your browser
- [bundle size analyzer](https://onlinetoolsforge.com/en/tools/bundle-size-analyzer/) — free online tool, runs in your browser
- [chmod calculator](https://onlinetoolsforge.com/en/tools/chmod-calculator/) — free online tool, runs in your browser
- [bitwise calculator](https://onlinetoolsforge.com/en/tools/bitwise-calculator/) — free online tool, runs in your browser
- [keyboard event tester](https://onlinetoolsforge.com/en/tools/keyboard-event-tester/) — free online tool, runs in your browser
- [dependencies checker](https://onlinetoolsforge.com/en/tools/dependencies-checker/) — free online tool, runs in your browser
- [api endpoint tester](https://onlinetoolsforge.com/en/tools/api-endpoint-tester/) — free online tool, runs in your browser
- [sig fig calculator](https://onlinetoolsforge.com/en/tools/sig-fig-calculator/): Free significant figures (sig fig) calculator. Count sig figs in any number, round to N significant figures, and perform add, subtract, multiply, and divide with correct sig-fig rounding rules. 100% client-side.
- [word unscrambler](https://onlinetoolsforge.com/en/tools/word-unscrambler/): Free online word unscrambler and anagram solver. Enter scrambled letters to instantly find all valid English words for Scrabble, Words With Friends, Wordle, and crossword puzzles. 100% client-side with a built-in dictionary of 58,000+ words.
- [token counter](https://onlinetoolsforge.com/en/tools/token-counter/) — free online tool, runs in your browser
- [json deep diff](https://onlinetoolsforge.com/en/tools/json-deep-diff/): Compare two JSON objects deeply and highlight added, removed, and changed values with full JSON Pointer paths, entirely in your browser.
- [json patch generator](https://onlinetoolsforge.com/en/tools/json-patch-generator/): Generate RFC 6902 JSON Patch operations by comparing two JSON documents entirely in your browser.
- [json to typescript](https://onlinetoolsforge.com/en/tools/json-to-typescript/) — free online tool, runs in your browser
- [json to java converter](https://onlinetoolsforge.com/en/tools/json-to-java-converter/): Generate Java POJO classes from JSON samples with nested types, nullable wrappers, Jackson annotations, and naming options.
- [json to protobuf schema](https://onlinetoolsforge.com/en/tools/json-to-protobuf-schema/): Infer proto3 message definitions from JSON samples with scalar type inference, nested messages, and repeated fields.
- [json to zod](https://onlinetoolsforge.com/en/tools/json-to-zod/): Convert JSON into TypeScript-ready Zod validation schemas with z.infer() type inference.
- [json schema generator](https://onlinetoolsforge.com/en/tools/json-schema-generator/): Generate JSON Schema (Draft 2020-12/2019-09/Draft-07) from any JSON example with inferred types, required fields, and detected string formats.
- [json to graphql schema](https://onlinetoolsforge.com/en/tools/json-to-graphql-schema/): Infer GraphQL Schema Definition Language (SDL) types from JSON samples with nested types and scalar mapping.
- [regex generator](https://onlinetoolsforge.com/en/tools/regex-generator/) — free online tool, runs in your browser
- [code playground](https://onlinetoolsforge.com/en/tools/code-playground/) — free online tool, runs in your browser
- [lighthouse score estimator](https://onlinetoolsforge.com/en/tools/lighthouse-score-estimator/) — free online tool, runs in your browser
- [graphql query builder](https://onlinetoolsforge.com/en/tools/graphql-query-builder/) — free online tool, runs in your browser
- [env to json converter](https://onlinetoolsforge.com/en/tools/env-to-json-converter/) — free online tool, runs in your browser
- [json to env converter](https://onlinetoolsforge.com/en/tools/json-to-env-converter/) — free online tool, runs in your browser
- [json to php array converter](https://onlinetoolsforge.com/en/tools/json-to-php-array-converter/) — free online tool, runs in your browser
- [env to tfvars convert](https://onlinetoolsforge.com/en/tools/env-to-tfvars-convert/) — free online tool, runs in your browser
- [tfvars to env converter](https://onlinetoolsforge.com/en/tools/tfvars-to-env-converter/) — free online tool, runs in your browser
- [subnet calculator](https://onlinetoolsforge.com/en/tools/subnet-calculator/) — free online tool, runs in your browser
- [text to morse converter](https://onlinetoolsforge.com/en/tools/text-to-morse-converter/) — free online tool, runs in your browser
- [color contrast checker](https://onlinetoolsforge.com/en/tools/color-contrast-checker/) — free online tool, runs in your browser
- [mac address generator](https://onlinetoolsforge.com/en/tools/mac-address-generator/): Generate, convert, and validate MAC addresses with comprehensive educational content. Learn about MAC address structure, vendor OUIs, formats, and security best practices.
- [mac address lookup](https://onlinetoolsforge.com/en/tools/mac-address-lookup/): Look up the vendor/manufacturer (OUI) of any MAC address from a bundled offline IEEE dataset. Detects unicast/multicast and universal/local bits, converts between colon, hyphen, dot, and bare formats, and derives the EUI-64 interface identifier and IPv6 link-local address.
- [dns lookup](https://onlinetoolsforge.com/en/tools/dns-lookup/) — free online tool, runs in your browser
- [rot13 encoder](https://onlinetoolsforge.com/en/tools/rot13-encoder/) — free online tool, runs in your browser
- [vigenere cipher](https://onlinetoolsforge.com/en/tools/vigenere-cipher/): Encrypt and decrypt text with the Vigenère cipher using a secret keyword. A classic polyalphabetic cipher — fully client-side, case-preserving, and instant. Perfect for cryptography students, CTF challenges, and puzzles.
- [caesar cipher](https://onlinetoolsforge.com/en/tools/caesar-cipher/): Free online Caesar cipher tool. Encrypt and decrypt text with any shift (1-25), crack unknown keys with brute-force, and learn the classic shift cipher. Case-preserving, instant, and 100% client-side — no signup.
- [find replace regex](https://onlinetoolsforge.com/en/tools/find-replace-regex/) — free online tool, runs in your browser
- [image color extractor](https://onlinetoolsforge.com/en/tools/image-color-extractor/): Extract color palettes and dominant colors from images. Analyze color composition and generate color schemes for design work.
- [image exif viewer](https://onlinetoolsforge.com/en/tools/image-exif-viewer/): View and remove EXIF metadata from images to protect privacy. Analyze camera settings, location data, and create clean versions of photos.
- [extractor tool](https://onlinetoolsforge.com/en/tools/extractor-tool/): Extract emails, phone numbers, hashtags, URLs and social mentions from text. Perfect for data cleaning, lead generation, and content analysis.
- [image pixelator](https://onlinetoolsforge.com/en/tools/image-pixelator/): Pixelate images to create privacy-protected versions or artistic pixel art effects. Perfect for face hiding and retro styling.
- [sql query builder](https://onlinetoolsforge.com/en/tools/sql-query-builder/): Build SQL queries visually with drag-and-drop interface. Generate SELECT, INSERT, UPDATE, DELETE queries with ease. Perfect for database developers and analysts.
- [temperature converter](https://onlinetoolsforge.com/en/tools/temperature-converter/) — free online tool, runs in your browser
- [weight converter](https://onlinetoolsforge.com/en/tools/weight-converter/) — free online tool, runs in your browser
- [data storage converter](https://onlinetoolsforge.com/en/tools/data-storage-converter/) — free online tool, runs in your browser
- [hmac generator](https://onlinetoolsforge.com/en/tools/hmac-generator/): Generate HMAC (Hash-based Message Authentication Code) for secure message authentication. Supports multiple hash algorithms.
- [crc16 calculator](https://onlinetoolsforge.com/en/tools/crc16-calculator/): Compute CRC-16 checksums (Modbus, CCITT, XMODEM, Kermit, X-25, IBM, USB, MAXIM, DNP) from text or hex input with full polynomial parameters, for embedded and industrial protocols.
- [crc32 checksum calculator](https://onlinetoolsforge.com/en/tools/crc32-checksum-calculator/): Calculate CRC32 and Adler32 checksums for file integrity verification and data validation. Fast, client-side processing with batch support.
- [htpasswd generator](https://onlinetoolsforge.com/en/tools/htpasswd-generator/): Generate Apache .htpasswd files with bcrypt password hashing for basic HTTP authentication.
- [certificate generator](https://onlinetoolsforge.com/en/tools/certificate-generator/): Generate self-signed SSL/TLS certificates for development and testing environments. Create RSA or ECDSA certificates with customizable parameters and Subject Alternative Names.
- [php password hash generator](https://onlinetoolsforge.com/en/tools/php-password-hash-generator/): Generate and verify PHP-compatible bcrypt password hashes with configurable cost factors. Test password strength and optimize performance for your application.
- [digital signature generator](https://onlinetoolsforge.com/en/tools/digital-signature-generator/): Generate RSA key pairs and create/verify digital signatures using Web Crypto API. Secure cryptographic operations for document signing and data integrity verification.
- [file hash checker](https://onlinetoolsforge.com/en/tools/file-hash-checker/): Calculate file hashes (MD5, SHA-1, SHA-256, SHA-512) for integrity verification and security. Batch process multiple files and verify checksums with drag-and-drop interface.
- [http headers viewer](https://onlinetoolsforge.com/en/tools/http-headers-viewer/): Parse and analyze HTTP request/response headers with detailed descriptions. Identify security headers, debugging information, and export data in multiple formats.
- [speed converter](https://onlinetoolsforge.com/en/tools/speed-converter/): Convert between different speed units including metric, imperial, nautical, and special units like Mach and Beaufort scale. Perfect for engineers, pilots, sailors, and physics calculations.
- [text profanity filter](https://onlinetoolsforge.com/en/tools/text-profanity-filter/): Clean and moderate text content with advanced profanity detection. Filter inappropriate language with customizable sensitivity levels, category-based filtering, and multiple output formats. Perfect for content moderation and text cleaning.
- [zero width space detector](https://onlinetoolsforge.com/en/tools/zero-width-space-detector/): Detect and remove zero-width characters from text. Find invisible spaces, non-breaking spaces, and other hidden characters that can cause issues in code and documents.
- [pressure converter](https://onlinetoolsforge.com/en/tools/pressure-converter/): Convert between different pressure units including Pascal, Bar, PSI, Atmosphere, and Torr. Perfect for engineers, scientists, meteorologists, and anyone working with pressure measurements.
- [angle converter](https://onlinetoolsforge.com/en/tools/angle-converter/): Convert between different angle units including degrees, radians, gradians, and turns. Perfect for mathematics, engineering, navigation, and trigonometry calculations with visual angle representations.
- [fuel efficiency converter](https://onlinetoolsforge.com/en/tools/fuel-efficiency-converter/): Convert between different fuel efficiency units including MPG, L/100km, km/L, and more. Perfect for vehicle comparison, fuel cost calculations, and environmental impact analysis with comprehensive vehicle efficiency data.
- [vat calculator](https://onlinetoolsforge.com/en/tools/vat-calculator/): Free online VAT calculator. Add VAT to a net price or extract VAT from a gross price. Includes country presets (Thailand 7%, UK 20%, Germany 19%) and custom rates. 100% client-side, instant results.
- [tax calculator](https://onlinetoolsforge.com/en/tools/tax-calculator/): Calculate income tax, sales tax, and VAT with support for multiple tax brackets and regions. Generate detailed tax breakdowns and understand your tax obligations.
- [discount calculator](https://onlinetoolsforge.com/en/tools/discount-calculator/): Calculate discounts, sale prices, and savings percentages. Perfect for shopping, business pricing, and understanding discount impacts on profit margins.
- [salary calculator](https://onlinetoolsforge.com/en/tools/salary-calculator/): Calculate net vs gross salary, hourly rates, overtime pay, and take-home pay after taxes and deductions. Includes support for different pay periods and benefits.
- [thai salary calculator](https://onlinetoolsforge.com/en/tools/thai-salary-calculator/): Calculate Thai salary, personal income tax (ภาษีเงินได้บุคคลธรรมดา), social security (ประกันสังคม), and provident fund. Supports Thai tax brackets for 2024 (พ.ศ. 2567).
- [investment roi calculator](https://onlinetoolsforge.com/en/tools/investment-roi-calculator/): Calculate Return on Investment (ROI), compound interest, investment growth, and risk metrics. Analyze investment performance and forecast future returns.
- [irr calculator](https://onlinetoolsforge.com/en/tools/irr-calculator/): Calculate the internal rate of return (IRR) from periodic cash flows with an NPV cross-check. Evaluate projects and investments by finding the discount rate where NPV equals zero.
- [amortization schedule generator](https://onlinetoolsforge.com/en/tools/amortization-schedule-generator/): Generate a month-by-month loan amortization schedule with principal and interest split, extra-payment what-if analysis, annual summary view, and CSV export.
- [inflation calculator](https://onlinetoolsforge.com/en/tools/inflation-calculator/): Calculate the impact of inflation on purchasing power over time. Compare historical prices and understand how inflation affects your savings and investments.
- [video to gif converter](https://onlinetoolsforge.com/en/tools/video-to-gif-converter/): Convert video clips to animated GIFs with customizable quality, size, and frame rate. Perfect for creating shareable content and reducing file sizes.
- [video thumbnail generator](https://onlinetoolsforge.com/en/tools/video-thumbnail-generator/): Extract thumbnails from videos at specific timeframes. Generate multiple preview images and custom poster frames for video content.
- [image sprites generator](https://onlinetoolsforge.com/en/tools/image-sprites-generator/): Create CSS sprites from multiple images to reduce HTTP requests and improve website performance. Generate optimized sprite sheets and CSS code.
- [animated gif creator](https://onlinetoolsforge.com/en/tools/animated-gif-creator/): Create animated GIFs from multiple images with customizable timing, transitions, and effects. Perfect for banners, presentations, and social media.
- [ip range calculator](https://onlinetoolsforge.com/en/tools/ip-range-calculator/): Calculate IP address ranges, subnet masks, and network configurations. Generate IP lists and validate network configurations for IPv4 and IPv6.
- [port scanner](https://onlinetoolsforge.com/en/tools/port-scanner/): Basic port scanning utility to check open ports and network services. Essential for network security testing and service verification.
- [whois lookup](https://onlinetoolsforge.com/en/tools/whois-lookup/): Lookup domain registration information, WHOIS data, and domain ownership details. Essential for domain research and security analysis.
- [keyword density checker](https://onlinetoolsforge.com/en/tools/keyword-density-checker/): Analyze keyword density and frequency in text content for SEO optimization. Calculate keyword prominence and get recommendations for better search engine ranking.
- [meta length checker](https://onlinetoolsforge.com/en/tools/meta-length-checker/) — free online tool, runs in your browser
- [utm campaign builder](https://onlinetoolsforge.com/en/tools/utm-campaign-builder/): Build UTM campaign URLs for marketing tracking. Create custom tracking parameters for Google Analytics and monitor campaign performance.
- [css triangle generator](https://onlinetoolsforge.com/en/tools/css-triangle-generator/): Generate CSS triangles and arrow shapes with customizable sizes, colors, and directions. Perfect for tooltips, indicators, and decorative elements.
- [glassmorphism generator](https://onlinetoolsforge.com/en/tools/glassmorphism-generator/): Create modern glassmorphism effects with CSS. Generate frosted glass designs, backdrop filters, and glass-like UI elements for modern web design.
- [neumorphism generator](https://onlinetoolsforge.com/en/tools/neumorphism-generator/): Generate neumorphic (soft UI) design elements with CSS. Create modern, tactile interface elements with subtle shadows and depth effects.
- [eyedropper tool](https://onlinetoolsforge.com/en/tools/eyedropper-tool/): Pick colors from anywhere on your screen using the EyeDropper API or screen capture fallback. Perfect for designers and developers working with colors.
- [local storage inspector](https://onlinetoolsforge.com/en/tools/local-storage-inspector/): View, edit, and manage browser LocalStorage data with a user-friendly interface. Perfect for developers debugging web applications.
- [batch file renamer](https://onlinetoolsforge.com/en/tools/batch-file-renamer/): Rename multiple files at once with powerful patterns including find/replace, numbering, case conversion, and batch operations.
- [archive creator extractor](https://onlinetoolsforge.com/en/tools/archive-creator-extractor/): Create and extract ZIP/TAR archives with compression options and file management features. Perfect for bundling multiple files or distributing content.
- [package json generator](https://onlinetoolsforge.com/en/tools/package-json-generator/): Build a valid package.json from name, version, scripts, dependencies, exports, and engine fields with live preview and download, all in-browser.
- [pantone color converter](https://onlinetoolsforge.com/en/tools/pantone-color-converter/): Convert colors between PANTONE, HEX, RGB, CMYK, HSL, and HSV formats. Find the closest PANTONE match for any color with comprehensive color information.
- [material design color generator](https://onlinetoolsforge.com/en/tools/material-design-color-generator/) — free online tool, runs in your browser
- [cookie manager](https://onlinetoolsforge.com/en/tools/cookie-manager/): View, edit, and manage browser cookies with advanced filtering, search, and security features. Perfect for developers debugging web applications and privacy-conscious users managing cookie data.
- [screen resolution checker](https://onlinetoolsforge.com/en/tools/screen-resolution-checker/): Professional screen resolution checker with comprehensive display analysis. Check screen dimensions, viewport size, pixel density, device pixel ratio, color depth, and orientation for responsive design testing.
- [system information viewer](https://onlinetoolsforge.com/en/tools/system-information-viewer/): Instantly view comprehensive browser and system information including user agent, platform, screen resolution, connection type, and web capabilities
- [click speed tester](https://onlinetoolsforge.com/en/tools/click-speed-tester/): Test your mouse clicking speed and accuracy with this interactive CPS tester
- [split merge files](https://onlinetoolsforge.com/en/tools/split-merge-files/): Professional file splitter and merger tool. Split large files into smaller manageable chunks or merge multiple files into one. Perfect for bypassing email attachment limits, cloud storage restrictions, and efficient file transfer.
- [pdf merge split](https://onlinetoolsforge.com/en/tools/pdf-merge-split/): Merge multiple PDF files into one or split a PDF into individual pages. 100% client-side — your files never leave your browser.
- [image to pdf converter](https://onlinetoolsforge.com/en/tools/image-to-pdf-converter/): Convert multiple images (JPG, PNG) into a single PDF document entirely in your browser. Perfect for scanning documents and combining photos.
- [disk usage calculator](https://onlinetoolsforge.com/en/tools/disk-usage-calculator/): Professional disk usage calculator with storage analysis, space optimization, and capacity planning features. Calculate disk space usage, analyze file distribution, and get comprehensive storage management insights.
- [curl to code converter](https://onlinetoolsforge.com/en/tools/curl-to-code-converter/): Convert cURL commands to code in various languages including JavaScript, Python, PHP, Go, and more. Debug APIs and copy requests directly from dev tools.
- [css unit converter](https://onlinetoolsforge.com/en/tools/css-unit-converter/): Convert between different CSS units (px, rem, em, %, vh, vw) with custom base font size support. Essential for responsive web design.
- [url parser](https://onlinetoolsforge.com/en/tools/url-parser/): Parse URLs into their components (protocol, host, path, query parameters) and edit query strings easily with a visual editor.
- [barcode decoder](https://onlinetoolsforge.com/en/tools/barcode-decoder/): Decode barcodes from images directly in your browser. Read EAN-13, EAN-8, UPC-A, Code 128, Code 39, ITF, Codabar and more with checksum validation — no upload required.
- [barcode generator](https://onlinetoolsforge.com/en/tools/barcode-generator/): Generate standard 1D barcodes (UPC-A, EAN-13, Code 128, Code 39) for products and inventory management. Download as high-quality images.
- [svg blob generator](https://onlinetoolsforge.com/en/tools/svg-blob-generator/): Generate unique, organic SVG blob shapes for web design backgrounds and modern UI elements. Customize complexity and randomness.
- [number to words converter](https://onlinetoolsforge.com/en/tools/number-to-words-converter/): Convert numerical values into written words (e.g., for cheques or legal documents). Supports multiple languages and currency formats.
- [roman numeral converter](https://onlinetoolsforge.com/en/tools/roman-numeral-converter/): Free online Roman numeral converter. Convert numbers (1–3999) to Roman numerals and Roman numerals back to numbers with a step-by-step breakdown. Instant, accurate, 100% client-side — no signup.
- [text to speech](https://onlinetoolsforge.com/en/tools/text-to-speech/): Convert text to spoken audio using advanced browser synthesis. Select voices, adjust speed and pitch, and listen to your content.
- [resume builder](https://onlinetoolsforge.com/en/tools/resume-builder/): Build professional resumes and CVs with live preview, multiple templates, and PDF export. 3 templates, 6 accent colors, auto-save. Free online resume builder.
- [pomodoro timer](https://onlinetoolsforge.com/en/tools/pomodoro-timer/): Boost productivity with a customizable Pomodoro timer. Manage work sessions and break intervals to stay focused and efficient.
- [credit card validator](https://onlinetoolsforge.com/en/tools/credit-card-validator/): Validate credit card numbers using the Luhn algorithm and identify card issuers. distinct from generators, safe and offline-only validation.
- [scientific calculator](https://onlinetoolsforge.com/en/tools/scientific-calculator/): Advanced scientific calculator with trigonometric functions, logarithms, powers, roots, and memory. Supports both degree and radian modes for angle calculations.
- [time duration calculator](https://onlinetoolsforge.com/en/tools/time-duration-calculator/): Calculate time durations between two times, add or subtract time intervals, and convert between different time units. Perfect for project management, billing, and time tracking.
- [cooking unit converter](https://onlinetoolsforge.com/en/tools/cooking-unit-converter/): Convert cooking measurements between volume, weight, and temperature. Includes ingredient-specific conversions (cups to grams) for flour, sugar, butter, and more.
- [git command generator](https://onlinetoolsforge.com/en/tools/git-command-generator/): Generate common Git commands for configuration, branching, syncing, and committing. Includes explanations and a quick reference guide.
- [habit tracker](https://onlinetoolsforge.com/en/tools/habit-tracker/) — free online tool, runs in your browser
- [meeting time coordinator](https://onlinetoolsforge.com/en/tools/meeting-time-coordinator/): Find the best meeting times across multiple time zones. Visualize working hours overlap for global teams.
- [color blindness simulator](https://onlinetoolsforge.com/en/tools/color-blindness-simulator/): Simulate different types of color blindness (protanopia, deuteranopia, tritanopia) for colors and images. Design accessible content.
- [websocket tester](https://onlinetoolsforge.com/en/tools/websocket-tester/): Test WebSocket connections in real-time. Send messages, view responses, and debug WebSocket communication.
- [html entity encoder](https://onlinetoolsforge.com/en/tools/html-entity-encoder/): Encode and decode HTML entities instantly. Convert special characters to HTML entities and vice versa. Essential for web developers.
- [eisenhower matrix](https://onlinetoolsforge.com/en/tools/eisenhower-matrix/): Organize tasks using the Eisenhower Matrix (urgent/important grid). Prioritize effectively with the 4-quadrant system.
- [aspect ratio cropper](https://onlinetoolsforge.com/en/tools/aspect-ratio-cropper/): Crop images to perfect aspect ratios for social media platforms. Presets for Instagram, YouTube, Twitter, and custom ratios.
- [npm package comparator](https://onlinetoolsforge.com/en/tools/npm-package-comparator/): Compare npm packages head-to-head. Analyze downloads, bundle size, dependencies, GitHub stats, and maintenance scores.
- [favicon previewer](https://onlinetoolsforge.com/en/tools/favicon-previewer/): Preview how your favicon looks in browser tabs, bookmarks, and mobile devices. Test favicon visibility across platforms.
- [image metadata editor](https://onlinetoolsforge.com/en/tools/image-metadata-editor/): Edit image EXIF metadata directly in your browser. Modify GPS location, camera settings, date taken, copyright info, and more.
- [fraction calculator](https://onlinetoolsforge.com/en/tools/fraction-calculator/): Calculate fractions with ease. Add, subtract, multiply, and divide fractions and mixed numbers with automatic simplification.
- [changelog generator](https://onlinetoolsforge.com/en/tools/changelog-generator/): Generate formatted changelogs for your software releases. Follow Keep a Changelog and Semantic Versioning standards.
- [ascii binary converter](https://onlinetoolsforge.com/en/tools/ascii-binary-converter/): Convert text to binary (ASCII/UTF-8) and binary back to text. Support for multiple encodings and delimiters.
- [toml yaml converter](https://onlinetoolsforge.com/en/tools/toml-yaml-converter/): Convert between TOML and YAML configuration file formats. Bidirectional conversion with syntax validation.
- [license generator](https://onlinetoolsforge.com/en/tools/license-generator/): Generate open source license files for your projects. Support for MIT, Apache 2.0, GPL, BSD, ISC, and more.
- [semver calculator](https://onlinetoolsforge.com/en/tools/semver-calculator/): Parse, compare, and calculate semantic versions. Bump versions and check version ranges.
- [env file validator](https://onlinetoolsforge.com/en/tools/env-file-validator/): Validate .env files and check for missing variables. Detect syntax errors, duplicates, and empty values.
- [iban validator](https://onlinetoolsforge.com/en/tools/iban-validator/): Validate IBAN bank account numbers from 70+ countries. Extract bank code, branch, and account details.
- [text to emoji converter](https://onlinetoolsforge.com/en/tools/text-to-emoji-converter/): Convert text to emoji representations. Transform words and sentences into expressive emoji sequences for fun social media posts.
- [unicode lookup](https://onlinetoolsforge.com/en/tools/unicode-lookup/): Search and browse Unicode characters by name, code point, or category. Get UTF-8, UTF-16, HTML entities, and CSS codes.
- [code screenshot generator](https://onlinetoolsforge.com/en/tools/code-screenshot-generator/): Create beautiful code screenshots for sharing. Customize themes, backgrounds, fonts, and export as PNG or SVG. Like Carbon app.
- [markdown linter](https://onlinetoolsforge.com/en/tools/markdown-linter/): Validate and style check your Markdown content. Fix common formatting issues and ensure consistency.
- [sql to mongodb converter](https://onlinetoolsforge.com/en/tools/sql-to-mongodb-converter/): Convert SQL queries to MongoDB syntax. Translate SELECT, INSERT, UPDATE, and DELETE statements.
- [css gradient border generator](https://onlinetoolsforge.com/en/tools/css-gradient-border-generator/): Create beautiful gradient borders with rounded corners using CSS. customizable colors, width, and radius.
- [placeholder avatar generator](https://onlinetoolsforge.com/en/tools/placeholder-avatar-generator/): Generate initial-based avatar images for user profiles. Customize colors, size, and text.
- [json path finder](https://onlinetoolsforge.com/en/tools/json-path-finder/): Find and test JSONPath expressions against your JSON data. Traverse complex JSON structures easily.
- [xpath tester](https://onlinetoolsforge.com/en/tools/xpath-tester/): Test XPath expressions against XML data. Debug and verify your XPath queries online.
- [npm run scripts builder](https://onlinetoolsforge.com/en/tools/npm-run-scripts-builder/): Build and organize npm run scripts visually for your package.json. Create script templates, chain commands, and manage complex build workflows.
- [readme generator](https://onlinetoolsforge.com/en/tools/readme-generator/): Generate professional README.md files for GitHub projects. Includes templates, badges, table of contents, and markdown preview.
- [gitignore generator](https://onlinetoolsforge.com/en/tools/gitignore-generator/): Create .gitignore files for your development stack. Templates for Node.js, Python, Java, and 100+ technologies and IDEs.
- [dockerignore generator](https://onlinetoolsforge.com/en/tools/dockerignore-generator/): Generate .dockerignore files from presets for Node.js, Python, Go, Java, and more. Keep Docker build contexts small, fast, and free of secrets.
- [openapi validator](https://onlinetoolsforge.com/en/tools/openapi-validator/): Validate OpenAPI 3.x and Swagger 2.0 specifications. Check schemas, references, security definitions, and best practices.
- [html table to json](https://onlinetoolsforge.com/en/tools/html-table-to-json/): Convert HTML tables to JSON format. Handles merged cells, automatic header detection, and multiple output formats.
- [og image generator](https://onlinetoolsforge.com/en/tools/og-image-generator/): Create Open Graph images for social media sharing. Customize templates, add logos, and generate 1200x630px preview images.
- [qr code designer](https://onlinetoolsforge.com/en/tools/qr-code-designer/): Design custom QR codes with logos, colors, and patterns. Export as SVG, PNG, or PDF with high error correction.
- [css custom properties generator](https://onlinetoolsforge.com/en/tools/css-custom-properties-generator/): Generate CSS custom properties (variables) for design systems. Create color palettes, spacing scales, typography, and theme tokens.
- [speech to text transcriber](https://onlinetoolsforge.com/en/tools/speech-to-text-transcriber/): Real-time speech recognition using Web Speech API. Transcribe audio to text, create notes from voice, with language detection and export options.
- [nfc tag reader writer](https://onlinetoolsforge.com/en/tools/nfc-tag-reader-writer/): Read and write NFC tags directly from browser. Create smart business cards, automation triggers, and launch URLs using Web NFC API.
- [gamepad tester](https://onlinetoolsforge.com/en/tools/gamepad-tester/): Test and map game controllers using Gamepad API. Visual button mapping, analog stick calibration, vibration testing, and input detection.
- [usb device info viewer](https://onlinetoolsforge.com/en/tools/usb-device-info-viewer/): Display connected USB devices using WebUSB API. View vendor IDs, product IDs, device capabilities, and connection information.
- [camera tester](https://onlinetoolsforge.com/en/tools/camera-tester/): Test your webcam and microphone in-browser. Live video preview, resolution, FPS measurement, real-time audio level meter, and device enumeration via getUserMedia.
- [random name picker](https://onlinetoolsforge.com/en/tools/random-name-picker/): Pick random names from your list. Perfect for raffles, giveaways, teacher classroom activities, and team selection.
- [reaction time tester](https://onlinetoolsforge.com/en/tools/reaction-time-tester/): Measure your human reaction time in milliseconds with a click/keypress stimulus test. Tracks average, best, worst, and percentile across multiple rounds with all-time best saved locally. Free, client-side, no signup.
- [battery network monitor](https://onlinetoolsforge.com/en/tools/battery-network-monitor/): Real-time battery level, charging status, network type, and connection quality using Navigator APIs. System status dashboard.
- [audio converter](https://onlinetoolsforge.com/en/tools/audio-converter/): Convert audio files between MP3, WAV, and OGG formats instantly in your browser. Free online audio converter with quality control.
- [graphql playground](https://onlinetoolsforge.com/en/tools/graphql-playground/) — free online tool, runs in your browser
- [dockerfile generator](https://onlinetoolsforge.com/en/tools/dockerfile-generator/): Generate production-ready Dockerfiles for Node.js, Python, Go, Java, PHP, Ruby, and more. Supports multi-stage builds, non-root users, healthchecks, and .dockerignore generation.
- [docker compose generator](https://onlinetoolsforge.com/en/tools/docker-compose-generator/): Generate docker-compose.yml files with multiple services. Configure images, ports, volumes, environment variables, depends_on, and restart policies. Export complete Docker Compose configurations.
- [kubernetes manifest generator](https://onlinetoolsforge.com/en/tools/kubernetes-manifest-generator/): Generate Kubernetes manifests for Deployments, Services, ConfigMaps, and Secrets. Configure replicas, images, resources, probes, and ports. Export ready-to-apply YAML.
- [cicd pipeline generator](https://onlinetoolsforge.com/en/tools/cicd-pipeline-generator/): Generate CI/CD pipeline configurations for GitHub Actions and GitLab CI. Visually configure build, test, lint, deploy steps. Export ready-to-commit YAML workflows.
- [graphql to typescript](https://onlinetoolsforge.com/en/tools/graphql-to-typescript/): Convert GraphQL schema (SDL) to TypeScript type definitions. Generate interfaces for types, inputs, and enums. Auto-map scalars, handle nullable fields and list types. Copy or download as .ts file.
- [metronome](https://onlinetoolsforge.com/en/tools/metronome/): Free online metronome with adjustable tempo (20-300 BPM), multiple time signatures, tap tempo, and accented downbeats. Sample-accurate timing powered by Web Audio API. Perfect for music practice.
- [whitespace remover](https://onlinetoolsforge.com/en/tools/whitespace-remover/): Remove and clean up whitespace in text. Collapse multiple spaces, remove all spaces, trim lines, remove line breaks, and delete empty lines. 100% client-side, no data sent anywhere.
- [timezone overlap finder](https://onlinetoolsforge.com/en/tools/timezone-overlap-finder/): Find the best meeting time across multiple timezones for distributed teams. Add team members, set working hours, and instantly see overlapping availability.
- [mortgage calculator](https://onlinetoolsforge.com/en/tools/mortgage-calculator/): Calculate your monthly mortgage payment including principal, interest, property tax, home insurance, PMI, and HOA. See the full amortization schedule. 100% client-side, free online mortgage calculator.
- [gpa calculator](https://onlinetoolsforge.com/en/tools/gpa-calculator/): Calculate your GPA on the 4.0 scale. Add courses with credit hours and letter grades, combine with a prior cumulative GPA, and instantly see Latin honors. 100% client-side, no signup required.
- [invoice generator](https://onlinetoolsforge.com/en/tools/invoice-generator/): Create professional invoices online and download them as PDF. Add line items, tax, discount, shipping, and notes. 100% client-side, free, no signup required.
- [calorie calculator](https://onlinetoolsforge.com/en/tools/calorie-calculator/): Calculate your daily calorie needs using the Mifflin-St Jeor equation. Estimate BMR, TDEE, and calorie targets for weight loss, maintenance, and weight gain. 100% client-side, free, no signup.
- [countdown timer](https://onlinetoolsforge.com/en/tools/countdown-timer/): Set a countdown timer with hours, minutes, and seconds. Get notified when time is up with sound and visual alerts. Perfect for cooking, workouts, exams, and presentations.
- [stopwatch](https://onlinetoolsforge.com/en/tools/stopwatch/): Precision online stopwatch with lap timing, split times, and start/stop/reset. Perfect for workouts, sports, cooking, experiments, and productivity tracking.
- [fancy text generator](https://onlinetoolsforge.com/en/tools/fancy-text-generator/): Convert plain text into 20+ fancy Unicode fonts — 𝓢𝓬𝓻𝓲𝓹𝓽, 𝔽𝕣𝕒𝕜𝕥𝕦𝕣, Ⓒⓘⓡⓒⓛⓔ, upside-down, fullwidth, and more. Copy & paste to Instagram, TikTok, Twitter, and gaming profiles. 100% free and browser-based.
- [nato phonetic converter](https://onlinetoolsforge.com/en/tools/nato-phonetic-converter/): Convert text to the NATO phonetic alphabet (Alpha, Bravo, Charlie) and decode it back. Spell out names, emails, and codes clearly for phone calls and radio. Includes a full reference chart. Free, fast, and 100% browser-based.
- [spin the wheel](https://onlinetoolsforge.com/en/tools/spin-the-wheel/): Free Spin the Wheel generator. Create a colorful spinning wheel of custom options to make random decisions, pick winners, and settle choices. Fun, fair, and 100% private.
- [readability checker](https://onlinetoolsforge.com/en/tools/readability-checker/): Free online readability checker. Paste any English text to instantly get Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog, SMOG, Coleman-Liau, and Automated Readability scores plus word, sentence, and syllable statistics. 100% client-side.
- [body fat calculator](https://onlinetoolsforge.com/en/tools/body-fat-calculator/): Calculate your body fat percentage using the U.S. Navy method. Enter height, neck, waist, and hip measurements with weight to get body fat %, fat mass, and lean body mass. Supports metric and imperial units for men and women. 100% client-side, free, no signup.
- [word cloud generator](https://onlinetoolsforge.com/en/tools/word-cloud-generator/): Generate beautiful word clouds from any text. Paste words or an article to instantly visualize the most frequent terms with collision-free layout, multiple color themes, and high-resolution PNG export. 100% client-side and private.
- [average calculator](https://onlinetoolsforge.com/en/tools/average-calculator/): Calculate mean, median, mode, range, sum, min, max, variance, standard deviation, quartiles, and more from a list of numbers. Free, fast, and 100% in your browser — ideal for students, teachers, and data analysis.
- [typing speed test](https://onlinetoolsforge.com/en/tools/typing-speed-test/): Test your typing speed and accuracy with this free online WPM test. Choose 15, 30, 60, or 120 seconds, type the sample text, and get instant WPM, CPM, and accuracy results. 100% client-side — no signup, no tracking.
- [sleep calculator](https://onlinetoolsforge.com/en/tools/sleep-calculator/): Calculate the best time to sleep or wake up based on 90-minute sleep cycles. Find your optimal bedtime for a target wake-up time, or see when to wake up if you sleep now — so you wake up refreshed and energized. 100% client-side and free.
- [username generator](https://onlinetoolsforge.com/en/tools/username-generator/): Generate unique, catchy usernames for Instagram, TikTok, gaming, and forums. Customize prefixes, separators, numbers, and leetspeak. 100% client-side, secure, and free.
- [running pace calculator](https://onlinetoolsforge.com/en/tools/running-pace-calculator/): Free running pace calculator. Find your pace, finish time, or distance, plus speed in km/h and mph and predicted splits for 5K, 10K, half marathon, and marathon. 100% client-side.
- [half life calculator](https://onlinetoolsforge.com/en/tools/half-life-calculator/): Free online half-life calculator for radioactive decay and exponential decay. Solve for remaining quantity, initial amount, half-life, or elapsed time. Includes common isotope presets (C-14, I-131, Co-60, U-238) and a decay timeline. 100% client-side.
- [word frequency counter](https://onlinetoolsforge.com/en/tools/word-frequency-counter/): Free online word frequency counter. Count how many times each word appears in your text, sort by frequency or alphabetically, filter stop words, and export to CSV. Perfect for content analysis, SEO, and vocabulary study. 100% client-side.
- [profit margin calculator](https://onlinetoolsforge.com/en/tools/profit-margin-calculator/): Calculate profit margin, markup, and revenue from cost and selling price. Perfect for businesses, retailers, and e-commerce to set profitable prices and analyze product profitability.
- [time card calculator](https://onlinetoolsforge.com/en/tools/time-card-calculator/): Free time card calculator with breaks and overtime. Enter clock-in and clock-out times for each day to total weekly work hours, detect overtime, and estimate gross pay. Handles overnight shifts. 100% client-side.
- [permutation combination calculator](https://onlinetoolsforge.com/en/tools/permutation-combination-calculator/): Calculate permutations (nPr) and combinations (nCr) with or without repetition. Exact arbitrary-precision BigInt results, formulas, and step-by-step working. Free online combinatorics calculator.
- [concrete calculator](https://onlinetoolsforge.com/en/tools/concrete-calculator/): Free concrete calculator. Estimate concrete volume and the number of pre-mixed bags needed for slabs, footings, columns, and post holes. Supports imperial and metric units, 40/60/80 lb bags, waste factor, and cost estimate. 100% client-side.
- [base64 encoder](https://onlinetoolsforge.com/en/tools/base64-encoder/): Free Base64 encoder and decoder with full UTF-8 Unicode support. Encode text to Base64 or decode Base64 strings instantly. URL-safe mode, live conversion, 100% client-side, no signup.
- [pregnancy due date calculator](https://onlinetoolsforge.com/en/tools/pregnancy-due-date-calculator/): Calculate your pregnancy due date (EDD) using Naegele\u2019s rule. Estimate from your last period, conception date, or ultrasound scan. See gestational age, trimester, weeks remaining, and key milestones. 100% client-side, free, no signup.
- [leet speak converter](https://onlinetoolsforge.com/en/tools/leet-speak-converter/): Free online leet speak (1337) converter. Translate text to leet speak with basic, intermediate, and advanced intensity levels, or decode leet back to plain text. 100% client-side.
- [gcf lcm calculator](https://onlinetoolsforge.com/en/tools/gcf-lcm-calculator/): Free online GCF and LCM calculator. Find the Greatest Common Factor (GCF, GCD, HCF) and Least Common Multiple (LCM) of two or more numbers with prime factorization. Uses Euclid\u2019s algorithm. 100% client-side.
- [syllable counter](https://onlinetoolsforge.com/en/tools/syllable-counter/): Free online syllable counter. Count syllables per word and in total, see a per-word breakdown, analyze line-by-line for haiku (5-7-5) patterns, and get average syllables per word. 100% client-side.
- [bionic reading converter](https://onlinetoolsforge.com/en/tools/bionic-reading-converter/): Free online Bionic Reading converter. Bold the first letters of each word to read faster and stay focused. Adjustable fixation, skip short words, live preview. Export to HTML or Markdown. 100% client-side.
- [sentence case converter](https://onlinetoolsforge.com/en/tools/sentence-case-converter/): Free online sentence case converter. Capitalize the first letter of every sentence automatically. Lowercase the rest, fix the pronoun "I", preserve acronyms, and collapse extra spaces. 100% client-side, no signup.
- [punctuation remover](https://onlinetoolsforge.com/en/tools/punctuation-remover/): Free online punctuation remover. Strip all punctuation marks from text instantly, or keep periods, commas, apostrophes, hyphens, and custom symbols. Replace with space or remove entirely. 100% client-side.
- [sentence splitter](https://onlinetoolsforge.com/en/tools/sentence-splitter/): Free online sentence splitter. Break text into a one-sentence-per-line list with smart abbreviation handling (Mr., Dr., e.g.), optional line-break boundaries, and numbered output. 100% client-side, no upload.
- [noise generator](https://onlinetoolsforge.com/en/tools/noise-generator/): Free online noise generator. Play continuous white, pink, brown, blue, and violet noise in your browser using the Web Audio API. Adjustable volume and a 30-minute sleep timer — perfect for focus, sleep, studying, and sound masking. 100% client-side, no signup.
- [spin wheel](https://onlinetoolsforge.com/en/tools/spin-wheel/): Free online spin wheel and random name picker. Add names or options, spin an animated wheel, and draw a fair winner using the Web Crypto API. Shuffle, sort, remove winners, and track history. 100% client-side.
- [resistor color code calculator](https://onlinetoolsforge.com/en/tools/resistor-color-code-calculator/): Decode resistor values from color bands (4, 5, or 6 band) and reverse-look-up the bands you need from an ohm value. Supports tolerance and temperature coefficient per IEC 60062. 100% client-side, free, no signup required.
- [scientific notation converter](https://onlinetoolsforge.com/en/tools/scientific-notation-converter/): Free online scientific notation converter. Convert decimal numbers to scientific notation and E-notation, and expand scientific notation back to full decimal form. Handles very large and very small numbers. 100% client-side.
- [pixel to rem converter](https://onlinetoolsforge.com/en/tools/pixel-to-rem-converter/): Free online Pixel to REM converter. Convert px to rem units instantly with a customizable root font-size, a full conversion table, Tailwind breakpoint values (sm, md, lg, xl, 2xl), and copy-ready CSS. 100% client-side.
- [volume calculator](https://onlinetoolsforge.com/en/tools/volume-calculator/): Free online volume calculator for 3D shapes. Calculate the volume of a box, cube, cylinder, sphere, cone, and pyramid. Get results in cm³, m³, in³, ft³, liters, and US gallons instantly. 100% client-side.
- [surface area calculator](https://onlinetoolsforge.com/en/tools/surface-area-calculator/): Free online surface area calculator for 3D shapes. Compute the surface area of a cube, box, cylinder, sphere, cone, and pyramid. Get results in cm², m², in², and ft² with formulas shown. 100% client-side.
- [json to csharp converter](https://onlinetoolsforge.com/en/tools/json-to-csharp-converter/): Convert JSON samples into clean C# classes with nested types, nullable references, and JsonPropertyName attributes. 100% client-side.
- [json to go struct](https://onlinetoolsforge.com/en/tools/json-to-go-struct/): Convert JSON to Go struct types instantly. Generates idiomatic Go structs with json tags, omitempty support, proper field alignment, and nested struct inference. 100% client-side.
- [levenshtein distance calculator](https://onlinetoolsforge.com/en/tools/levenshtein-distance-calculator/): Free online Levenshtein distance calculator. Measure the edit distance and similarity ratio between two strings instantly. Shows substitution, insertion, and deletion counts, character alignment, and the full DP matrix. 100% client-side.
- [cubic bezier generator](https://onlinetoolsforge.com/en/tools/cubic-bezier-generator/): Free online cubic-bezier easing curve generator. Drag control points on an interactive graph to design CSS transition and animation timing functions. Copy ready-to-use cubic-bezier() CSS, compare against linear, and preview the animation live. 100% client-side.
- [css spring easing generator](https://onlinetoolsforge.com/en/tools/css-spring-easing-generator/): Free online CSS spring easing generator. Tune stiffness, damping, and mass to design physics-based spring motion and copy ready-to-use linear() CSS easing. Live preview, eight presets, and full underdamped/overdamped support. 100% client-side.
- [ohms law calculator](https://onlinetoolsforge.com/en/tools/ohms-law-calculator/): Free online Ohm\u2019s Law calculator. Enter any two of voltage, current, resistance, or power and instantly get the remaining values with step-by-step derivations. Covers all six input combinations using V = I \u00d7 R and P = V \u00d7 I. 100% client-side.
- [fuel cost calculator](https://onlinetoolsforge.com/en/tools/fuel-cost-calculator/): Free online fuel cost calculator. Estimate trip fuel cost from distance, vehicle fuel efficiency, and fuel price. Supports metric (km, L/100km) and imperial (miles, MPG) units, and splits costs among passengers. 100% client-side.
- [npv calculator](https://onlinetoolsforge.com/en/tools/npv-calculator/): Free online NPV (Net Present Value) calculator. Enter an initial investment, a discount rate, and yearly cash flows to compute NPV, the present value of inflows, and the profitability index. Includes a full year-by-year discounting breakdown. 100% client-side.
- [payback period calculator](https://onlinetoolsforge.com/en/tools/payback-period-calculator/): Free online payback period calculator. Enter an initial investment and yearly cash flows to compute the simple payback period and the discounted payback period, with a cumulative cash flow breakdown and years+months readout. 100% client-side.
- [heat index calculator](https://onlinetoolsforge.com/en/tools/heat-index-calculator/): Free online heat index calculator. Enter air temperature and relative humidity to get the "feels-like" apparent temperature using the NWS Rothfusz formula. Supports Fahrenheit and Celsius with a color-coded heat safety level. 100% client-side.
- [wind chill calculator](https://onlinetoolsforge.com/en/tools/wind-chill-calculator/): Free online wind chill calculator. Enter air temperature and wind speed to get the cold-weather feels-like temperature using the NWS and Environment Canada wind chill formula. Supports Fahrenheit/Celsius and mph/km/h with a color-coded frostbite risk level. 100% client-side.
- [download time calculator](https://onlinetoolsforge.com/en/tools/download-time-calculator/): Free online download time calculator. Estimate how long a file or app will take to download based on its size and your internet speed. Supports KB, MB, GB, TB and Kbps, Mbps, Gbps with a reference table of common speeds. 100% client-side.
- [graph plotter](https://onlinetoolsforge.com/en/tools/graph-plotter/): Free online function graph plotter. Plot one or more mathematical functions like sin(x), x^2, or exp(x) on an interactive canvas with zoom, pan, and a customizable axis range. Supports trigonometric, exponential, and logarithmic functions. 100% client-side and offline.
- [water intake calculator](https://onlinetoolsforge.com/en/tools/water-intake-calculator/): Free online water intake calculator. Estimate your daily hydration needs based on body weight, exercise, climate, and special conditions like pregnancy or breastfeeding. Shows results in liters, ounces, glasses, bottles, and cups. 100% client-side.
- [prime factorization calculator](https://onlinetoolsforge.com/en/tools/prime-factorization-calculator/): Free online prime factorization calculator. Factor any integer up to 10^15 into prime factors with exponents, find all divisors, check if prime, and see next/previous primes. Step-by-step breakdown. 100% client-side.
- [bill splitter](https://onlinetoolsforge.com/en/tools/bill-splitter/): Free online bill splitter calculator. Split a restaurant or group bill fairly among any number of people with percentage or flat-amount tips, optional sales tax, and a clear per-person breakdown. 100% client-side.
- [unicode escape converter](https://onlinetoolsforge.com/en/tools/unicode-escape-converter/): Free online Unicode escape and unescape converter. Convert any text into JavaScript-style \uXXXX or \u{...} escape sequences, or decode escaped strings back to readable text. Full support for emoji, Thai, and astral characters. 100% client-side.
- [csv merger](https://onlinetoolsforge.com/en/tools/csv-merger/): Join two CSV files on a shared key column like a spreadsheet VLOOKUP or SQL join. Left or inner join, per-column picker, duplicate-key handling, and RFC 4180 quoted-field parsing.
- [csv to excel converter](https://onlinetoolsforge.com/en/tools/csv-to-excel-converter/): Free online CSV to Excel converter. Turn CSV or TSV data into a real .xlsx spreadsheet in your browser with styled headers, auto column widths, and number detection. Drag-drop, paste, or upload. 100% client-side, no upload to server.
- [density converter](https://onlinetoolsforge.com/en/tools/density-converter/): Free online density converter. Convert between kg/m³, g/cm³, lb/ft³, lb/gal, slug/ft³, and specific gravity instantly with live results and a full all-unit conversion table. 100% client-side.
- [frequency converter](https://onlinetoolsforge.com/en/tools/frequency-converter/): Free online frequency converter. Convert between hertz (Hz), kilohertz (kHz), megahertz (MHz), gigahertz (GHz), terahertz (THz), and RPM in one click. Instant live results, all-unit table, and copy support. 100% client-side.
- [torque converter](https://onlinetoolsforge.com/en/tools/torque-converter/): Free online torque converter. Convert between newton-meter (N·m), pound-foot (lb·ft), pound-inch (lb·in), kilogram-force meter (kgf·m), and dyne-centimeter (dyn·cm) instantly with live results and a full all-unit conversion table. 100% client-side.
- [line ending converter](https://onlinetoolsforge.com/en/tools/line-ending-converter/): Free online line ending converter. Normalize text between LF (Unix/macOS), CRLF (Windows), and CR (classic Mac) line endings. Detect mixed endings, view per-type counts, and download the converted file. 100% client-side.
- [hashtag generator](https://onlinetoolsforge.com/en/tools/hashtag-generator/): Free online hashtag generator. Enter a topic or phrase to instantly create relevant hashtags for social media. Choose lowercase or title case, pick a separator, set a count, and copy them all with one click. 100% client-side.
- [morse code converter](https://onlinetoolsforge.com/en/tools/morse-code-converter/): Free online Morse code converter. Convert plain text to International Morse code and decode Morse code back to text with one click. Supports letters, digits, and common punctuation, with words separated by a slash. Works 100% client-side and offline.
- [color name lookup](https://onlinetoolsforge.com/en/tools/color-name-lookup/): Free online color name finder. Enter any hex color and get the nearest CSS/HTML named color with RGB values and a match percentage. Shows the top 5 closest named colors, distance, and ready-to-copy CSS code. 100% client-side.
- [pitch frequency calculator](https://onlinetoolsforge.com/en/tools/pitch-frequency-calculator/): Calculate musical note frequencies from a reference pitch. Convert between note names, MIDI numbers, and Hertz with equal temperament tuning.
- [latex equation renderer](https://onlinetoolsforge.com/en/tools/latex-equation-renderer/): Render LaTeX math equations into crisp typeset output via KaTeX with SVG and PNG export, display and inline modes, and copy-paste HTML — all in your browser.
- [learning rate calculator](https://onlinetoolsforge.com/en/tools/learning-rate-calculator/): Convert between ML learning rate formats: decimal, scientific notation, and percentage. Compare optimizer defaults, preview schedules, and copy PyTorch or TensorFlow snippets.
- [epoch batch converter](https://onlinetoolsforge.com/en/tools/epoch-batch-converter/): Convert multiple Unix timestamps to human-readable dates at once. Paste a list, pick a timezone, export CSV. Auto-detects seconds vs milliseconds.
- [regex cheatsheet](https://onlinetoolsforge.com/en/tools/regex-cheatsheet/): Interactive regex cheat sheet with syntax reference and examples.
- [isbn validator](https://onlinetoolsforge.com/en/tools/isbn-validator/): Validate ISBN-10 and ISBN-13 checksums and convert between them.
- [iban breakdown](https://onlinetoolsforge.com/en/tools/iban-breakdown/): Break down any IBAN into its ISO 13616 components: country, check digits, BBAN, bank code, branch, and account number with mod-97 checksum validation.
- [vin decoder](https://onlinetoolsforge.com/en/tools/vin-decoder/): Decode a Vehicle Identification Number (VIN) into country, manufacturer, model year, and serial fields with ISO 3779 check-digit validation.
- [color shades generator](https://onlinetoolsforge.com/en/tools/color-shades-generator/): Generate a scale of tints and shades from any base color. Mix toward white and black in equal steps to build design-system color palettes with HEX, RGB, and HSL values.
- [color scheme rotate](https://onlinetoolsforge.com/en/tools/color-scheme-rotate/): Rotate any color around the color wheel by N degrees to generate complementary, analogous, triadic, and tetradic color schemes with live preview.
- [oklch color converter](https://onlinetoolsforge.com/en/tools/oklch-color-converter/): Convert between OKLCH, OKLab, and sRGB HEX/RGB/HSL for modern CSS Color Level 4 with live preview and gamut clamping.
- [title case converter](https://onlinetoolsforge.com/en/tools/title-case-converter/): Free online title case converter. Capitalize the major words in titles and headings following AP, Chicago, or simple title case rules. Preserve acronyms, handle hyphenated words, and capitalize the last word. 100% client-side, no signup.
- [css scope generator](https://onlinetoolsforge.com/en/tools/css-scope-generator/): Free online CSS @scope generator. Build scoped CSS rules with a root selector and an optional lower-bound selector to limit cascade penetration. Live preview, minify option, copy and download. 100% client-side, no signup.
- [aspect ratio from size](https://onlinetoolsforge.com/en/tools/aspect-ratio-from-size/): Reduce any width × height to its simplest aspect ratio. Enter 1920×1080 and get 16:9 instantly.
- [sitemap url extractor](https://onlinetoolsforge.com/en/tools/sitemap-url-extractor/): Parse a sitemap.xml and extract all URLs into a filterable, downloadable list.
- [systemd unit generator](https://onlinetoolsforge.com/en/tools/systemd-unit-generator/): Generate systemd .service, .timer, and .socket unit files. Configure ExecStart, restart policy, OnCalendar timers, and socket activation — export a ready-to-use Linux unit file.
- [unicode normalizer](https://onlinetoolsforge.com/en/tools/unicode-normalizer/): Normalize text to Unicode NFC, NFD, NFKC, or NFKD forms and inspect the exact code points (U+XXXX) of every character to reveal hidden combining marks, zero-width spaces, and lookalike glyphs.
- [csv diff](https://onlinetoolsforge.com/en/tools/csv-diff/): Compare two CSV datasets and instantly see added rows, removed rows, and cell-level changes. Match by key column or row order, with RFC 4180 quoted-field parsing.
- [hex viewer](https://onlinetoolsforge.com/en/tools/hex-viewer/): View any text, hex string, or binary file as a classic hex dump with offset, byte, and ASCII columns. Search, copy, and download — all in the browser.
- [bcrypt generator](https://onlinetoolsforge.com/en/tools/bcrypt-generator/): Generate and verify bcrypt password hashes with an adjustable cost factor. Secure client-side hashing with $2a$, $2b$, $2y$ support.
- [social share link generator](https://onlinetoolsforge.com/en/tools/social-share-link-generator/): Build share URLs for Facebook, X (Twitter), LinkedIn, WhatsApp, Telegram, Reddit, email, and SMS. Copy or open optimized social share links instantly.
- [gron converter](https://onlinetoolsforge.com/en/tools/gron-converter/): Flatten JSON into dotted key assignments (gron style) and reverse GRON back into JSON. 100% client-side.
- [punycode converter](https://onlinetoolsforge.com/en/tools/punycode-converter/): Convert internationalized domain names (IDN) between Unicode and Punycode (xn--) encoding. RFC 3492 compliant.
- [screen recorder](https://onlinetoolsforge.com/en/tools/screen-recorder/): Record your screen, browser tab, or application window directly in the browser using the MediaRecorder API. No installs, no uploads, 100% client-side with optional microphone narration.
- [csv to markdown converter](https://onlinetoolsforge.com/en/tools/csv-to-markdown-converter/): Free online CSV to Markdown table converter. Convert comma-separated values into GitHub-flavored Markdown tables with column alignment and header options. RFC-4180 compliant, 100% client-side, no upload.
- [markdown to csv converter](https://onlinetoolsforge.com/en/tools/markdown-to-csv-converter/): Free online Markdown to CSV converter. Convert GitHub-flavored Markdown tables into clean CSV with custom delimiters. Handles escaped pipes and multi-column tables. 100% client-side, no upload.
- [tsv to csv converter](https://onlinetoolsforge.com/en/tools/tsv-to-csv-converter/): Free online TSV to CSV converter. Convert tab-separated values to comma-separated values with custom delimiters and quoting rules. RFC-4180 compliant, 100% client-side, no upload.
- [csv to jsonl converter](https://onlinetoolsforge.com/en/tools/csv-to-jsonl-converter/): Free online CSV to JSONL/NDJSON converter. Convert comma-separated values to JSON Lines (one JSON object per line) for AI training data and streaming pipelines. Auto-detect delimiter, header-aware, 100% client-side, no upload.
- [csv cleaner](https://onlinetoolsforge.com/en/tools/csv-cleaner/): Free online CSV cleaner. Remove empty rows, deduplicate rows, trim whitespace, fix stray quotes, strip BOM, and remove empty columns. RFC-4180 compliant, 100% client-side, no upload.
- [matrix calculator](https://onlinetoolsforge.com/en/tools/matrix-calculator/): Free online matrix calculator. Add, subtract, multiply, transpose matrices, and compute determinants and inverses. Enter matrices in grid form and get instant results. 100% client-side.
- [set operations](https://onlinetoolsforge.com/en/tools/set-operations/): Free online set operations calculator. Compute the union, intersection, difference, and symmetric difference of two lists. Instant results with cardinality, subset, and equality checks. 100% client-side.
- [carbon footprint calculator](https://onlinetoolsforge.com/en/tools/carbon-footprint-calculator/): Free online carbon footprint calculator. Estimate your annual CO2 emissions from transport, home energy, and diet. Compare against global averages and the Paris Agreement target. 100% client-side.
- [xor cipher](https://onlinetoolsforge.com/en/tools/xor-cipher/): Free online XOR cipher tool. Encrypt or decrypt text with a key using the XOR cipher and get hex output. Supports UTF-8 and hex keys. 100% client-side, no data sent to servers.
- [data uri generator](https://onlinetoolsforge.com/en/tools/data-uri-generator/): Free online Data URI Generator. Convert text or files (images, PDFs, fonts) into base64 data URIs for inline embedding in HTML/CSS, or decode data URIs back to text. Drag-drop, custom MIME types, 100% client-side.
- [mandelbrot explorer](https://onlinetoolsforge.com/en/tools/mandelbrot-explorer/): Free online Mandelbrot set explorer. Zoom into the famous fractal infinitely, pan across the complex plane, choose color palettes, and export high-resolution PNG images. 100% client-side rendering with smooth coloring and adjustable iteration depth.
- [spf record builder](https://onlinetoolsforge.com/en/tools/spf-record-builder/): Free online SPF record builder. Create and validate Sender Policy Framework (SPF) DNS TXT records with ip4, ip6, include, a, mx, and exists mechanisms. Tracks DNS lookup limits (RFC 7208) and generates the exact TXT string to publish.
- [dmarc record builder](https://onlinetoolsforge.com/en/tools/dmarc-record-builder/): Free online DMARC record builder. Create DMARC DNS TXT records with p, sp, rua, ruf, fo, adkim, aspf, ri, and pct tags. Supports none/quarantine/reject policies, relaxed/strict alignment, and aggregate/forensic reporting. Generates the exact TXT string to publish at _dmarc.yourdomain.com.
- [gray code converter](https://onlinetoolsforge.com/en/tools/gray-code-converter/): Convert between decimal, binary, and Gray code (reflected binary) for digital electronics.
- [ripemd hash generator](https://onlinetoolsforge.com/en/tools/ripemd-hash-generator/): Generate RipeMD-128, RipeMD-160, RipeMD-256, and RipeMD-320 checksums from text in-browser.
- [bcd converter](https://onlinetoolsforge.com/en/tools/bcd-converter/): Convert between decimal and Binary Coded Decimal (BCD) — packed, unpacked, and binary comparison.
- [statistics calculator](https://onlinetoolsforge.com/en/tools/statistics-calculator/): Calculate standard deviation, variance, coefficient of variation, standard error, skewness, and kurtosis from a list of numbers. Supports sample and population datasets.
- [triangle calculator](https://onlinetoolsforge.com/en/tools/triangle-calculator/): Solve triangles from sides and angles. Compute area, perimeter, missing sides, and triangle type (equilateral, isosceles, scalene, right, acute, obtuse) using Heron formula and the law of cosines. 100% client-side.
- [base45 converter](https://onlinetoolsforge.com/en/tools/base45-converter/): Encode and decode Base45 (RFC 9285) text in-browser. Used for EU Digital COVID Certificates and compact QR payloads.
- [base32 converter](https://onlinetoolsforge.com/en/tools/base32-converter/): Encode and decode Base32 (RFC 4648) and Crockford Base32 text in-browser. Supports optional padding for TOTP secrets and DNSSEC identifiers.
- [base58 converter](https://onlinetoolsforge.com/en/tools/base58-converter/): Encode and decode Base58 (Bitcoin/IPFS alphabet) text in-browser. Supports Bitcoin and Flickr alphabets with UTF-8 and hex output.
- [image to ico converter](https://onlinetoolsforge.com/en/tools/image-to-ico-converter/): Free online image to ICO converter. Turn PNG, JPEG, WebP, GIF, or BMP images into multi-resolution .ico favicon files (16–256px). Choose which sizes to embed, preview each, and download instantly. 100% client-side, no upload.
- [energy converter](https://onlinetoolsforge.com/en/tools/energy-converter/): Free online energy converter. Convert between joules, calories, BTU, kilowatt-hours, electronvolts, and therms instantly.
- [power converter](https://onlinetoolsforge.com/en/tools/power-converter/): Free online power converter. Convert between watts, kilowatts, megawatts, gigawatts, milliwatts, horsepower, PS, BTU/hour, foot-pounds/second, and calories/second instantly.
- [force converter](https://onlinetoolsforge.com/en/tools/force-converter/): Free online force converter. Convert between newtons, kilonewtons, meganewtons, dynes, kilogram-force, gram-force, tonne-force, pound-force, ounce-force, and poundals instantly.
- [ascii table reference](https://onlinetoolsforge.com/en/tools/ascii-table-reference/): Interactive ASCII table with decimal, hex, octal, binary, and character lookups.
- [ring size converter](https://onlinetoolsforge.com/en/tools/ring-size-converter/): Convert ring sizes between US, UK (letters), EU/ISO, and JP/CN measurement systems with inner diameter and circumference.
- [shoe size converter](https://onlinetoolsforge.com/en/tools/shoe-size-converter/): Convert shoe sizes between US men, US women, US kids, UK, EU, CM, and Mondopoint measurement systems.
- [meeting cost calculator](https://onlinetoolsforge.com/en/tools/meeting-cost-calculator/): Calculate the real cost of a meeting from the number of attendees, hourly rate or annual salary, and duration.
- [aes encrypt decrypt](https://onlinetoolsforge.com/en/tools/aes-encrypt-decrypt/): Free online AES encrypt/decrypt tool. Securely encrypt or decrypt text with AES-128/192/256-GCM using a password. PBKDF2 key derivation, 100% client-side, no data sent to servers.
- [css container query generator](https://onlinetoolsforge.com/en/tools/css-container-query-generator/): Free online CSS Container Query generator. Build @container and container-type rules with a live preview. Named containers, min/max width queries, inline-size and size types. Copy-ready CSS. 100% client-side.
- [css at property generator](https://onlinetoolsforge.com/en/tools/css-at-property-generator/): Free online CSS @property generator. Build typed CSS custom properties with syntax, inheritance, initial values, and a live preview. Copy-ready CSS, 100% client-side.
- [css clamp generator](https://onlinetoolsforge.com/en/tools/css-clamp-generator/): Free online CSS clamp() generator. Build responsive fluid typography with min, preferred, and max values. Live viewport preview, px/rem/vw units, and copy-ready CSS. 100% client-side.
- [css media query generator](https://onlinetoolsforge.com/en/tools/css-media-query-generator/): Free online CSS media query generator. Build responsive breakpoints for Tailwind, Bootstrap, or custom widths with min-width and max-width queries, hover and dark mode conditions, and a live viewport preview.
- [online notepad](https://onlinetoolsforge.com/en/tools/online-notepad/): A private, offline-first notepad. Write and organize multiple notes with auto-save to your browser. No account, no server, no sync. Export anytime.
- [english to cron](https://onlinetoolsforge.com/en/tools/english-to-cron/): Convert plain English phrases like "every weekday at 9am" into cron schedule expressions. Live parsing, field breakdown, and one-click copy. 100% client-side.
- [css color mix generator](https://onlinetoolsforge.com/en/tools/css-color-mix-generator/): Free online CSS color-mix() generator. Blend two colors in sRGB, OKLab, OKLCH, HSL, and more with a live preview and copy-ready CSS. 100% client-side.
- [css light dark generator](https://onlinetoolsforge.com/en/tools/css-light-dark-generator/): Free online CSS light-dark() generator. Build light-dark() color pairs for automatic light/dark theme switching with a live preview and copy-ready CSS. 100% client-side.
- [css view transition generator](https://onlinetoolsforge.com/en/tools/css-view-transition-generator/): Generate CSS view-transition-name declarations and ::view-transition-old/new() pseudo-element styles with a live preview. Copy-ready code for SPA and MPA page transitions.
- [adler32 hash generator](https://onlinetoolsforge.com/en/tools/adler32-hash-generator/): Compute Adler-32 checksums from text or files entirely in-browser, used by zlib and DEFLATE.
- [oklch contrast checker](https://onlinetoolsforge.com/en/tools/oklch-contrast-checker/): Check WCAG 2.x color contrast ratios with live OKLCH/OKLab controls. Test foreground/background pairs for AA and AAA compliance and see the perceptual OKLab Delta-E, all in-browser.
- [css text wrap generator](https://onlinetoolsforge.com/en/tools/css-text-wrap-generator/): Free online CSS text-wrap generator. Build and preview text-wrap: balance, pretty, stable, and wrap with a live side-by-side comparison. Adjust font size, weight, and line height. Copy-ready CSS. 100% client-side.
- [svg shape divider generator](https://onlinetoolsforge.com/en/tools/svg-shape-divider-generator/): Free online SVG section divider generator. Create wave, curve, triangle, zigzag, peaks, and split dividers for hero sections and footers. Adjustable width, height, colors, and repetitions. Copy-paste SVG code. 100% client-side.
- [css to tailwind converter](https://onlinetoolsforge.com/en/tools/css-to-tailwind-converter/): Free online CSS to Tailwind converter. Paste plain CSS rules and instantly get equivalent Tailwind utility classes. Supports display, flex, grid, spacing, typography, borders, colors, shadows, and more. 100% client-side.
- [user agent generator](https://onlinetoolsforge.com/en/tools/user-agent-generator/): Free online User Agent Generator. Pick from common browser/OS user-agent strings (Chrome, Firefox, Safari, Edge, mobile, Googlebot) or build a custom one. Copy ready-to-paste UA strings for testing. 100% client-side.
- [ai token cost estimator](https://onlinetoolsforge.com/en/tools/ai-token-cost-estimator/): Free AI Token Cost Estimator. Estimate token counts and API costs for GPT-4o, Claude, Gemini, and Llama models. Compare per-request, monthly, and yearly costs across vendors offline. 100% client-side.
- [cpm calculator](https://onlinetoolsforge.com/en/tools/cpm-calculator/): Calculate advertising Cost Per Mille (CPM) from total cost and impressions, or solve for any of the three variables.
- [ctr calculator](https://onlinetoolsforge.com/en/tools/ctr-calculator/): Calculate Click-Through Rate (CTR) percentage from impressions and clicks, or solve for any of the three variables.
- [btu calculator](https://onlinetoolsforge.com/en/tools/btu-calculator/): Size air conditioner capacity in BTU/h, kW, and tons from room dimensions, ceiling height, insulation, sun exposure, climate, and occupancy.
- [break even calculator](https://onlinetoolsforge.com/en/tools/break-even-calculator/): Calculate break-even units and revenue from fixed costs, variable costs, and price per unit, with target-profit and profit scenarios.
- [conversion rate calculator](https://onlinetoolsforge.com/en/tools/conversion-rate-calculator/): Calculate website or ad conversion rate from visitors/sessions and conversions, with revenue-per-visitor insight. Solve for rate, conversions, or visitors.
- [cofounder equity calculator](https://onlinetoolsforge.com/en/tools/cofounder-equity-calculator/): Calculate a fair co-founder equity split from role, time commitment, cash investment, and idea origin using a transparent weighted model.
- [freelance rate calculator](https://onlinetoolsforge.com/en/tools/freelance-rate-calculator/): Calculate your freelance hourly, day, and weekly rates from income goals, expenses, taxes, vacation, and billable hours so you never underprice your work.
- [json stringify converter](https://onlinetoolsforge.com/en/tools/json-stringify-converter/): Stringify plain text or JSON to a JSON string and parse it back with proper escape handling.
- [gradient text generator](https://onlinetoolsforge.com/en/tools/gradient-text-generator/): Create multi-color CSS gradient text effects with copy-paste HTML and CSS code.
- [css scroll driven animations generator](https://onlinetoolsforge.com/en/tools/css-scroll-driven-animations-generator/): Free online CSS scroll-driven animations generator. Build animation-timeline: scroll() and view() animations with live preview, keyframe controls, and copy-ready CSS. 100% client-side.
- [audio waveform visualizer](https://onlinetoolsforge.com/en/tools/audio-waveform-visualizer/): Free online audio waveform visualizer. Load any audio file (MP3, WAV, OGG, M4A, FLAC) to render an interactive waveform with play, zoom, seek, and PNG export. 100% in-browser, no upload required.
- [prompt template builder](https://onlinetoolsforge.com/en/tools/prompt-template-builder/): Free online LLM prompt template builder. Create reusable prompt templates with named variables and live fill-in preview. Export or copy ready-to-use prompts. 100% in-browser, no API key required.
- [pdf to image converter](https://onlinetoolsforge.com/en/tools/pdf-to-image-converter/): Render PDF pages as PNG or JPEG images in your browser with adjustable resolution, individual downloads, and ZIP export.
- [pdf page counter](https://onlinetoolsforge.com/en/tools/pdf-page-counter/): Count pages in a PDF and view document metadata (title, author, creation date, encryption status). 100% client-side — your files never leave your browser.
- [pdf rotate](https://onlinetoolsforge.com/en/tools/pdf-rotate/): Rotate PDF pages 90, 180, or 270 degrees — per page or all at once. 100% client-side — your files never leave your browser.
- [pdf watermark stamper](https://onlinetoolsforge.com/en/tools/pdf-watermark-stamper/): Stamp diagonal text watermarks (DRAFT, CONFIDENTIAL, custom) onto PDF pages with opacity, size, rotation, color, and position control — 100% in your browser.
- [csv to html table converter](https://onlinetoolsforge.com/en/tools/csv-to-html-table-converter/): Convert CSV data into styled, sortable HTML tables with custom headers, CSS styles, and captions. RFC-4180 compliant, 100% client-side.
- [svg to png converter](https://onlinetoolsforge.com/en/tools/svg-to-png-converter/): Convert SVG to PNG or JPEG in your browser at any size, scale, or DPI. Supports custom dimensions, transparency, background color, and JPEG quality — 100% client-side.
- [text to handwriting converter](https://onlinetoolsforge.com/en/tools/text-to-handwriting-converter/): Convert typed text into realistic handwriting-style images using HTML5 Canvas and Google handwriting fonts. Choose from 7 fonts, ink and paper colors, font size, and lined/grid/blank paper — 100% client-side, no upload.
- [regex redos checker](https://onlinetoolsforge.com/en/tools/regex-redos-checker/): Scan regex patterns for catastrophic backtracking (ReDoS) risk. Detects nested quantifiers, overlapping alternations, and evil patterns with a safety score — 100% in-browser.
- [mermaid diagram renderer](https://onlinetoolsforge.com/en/tools/mermaid-diagram-renderer/): Render flowcharts, sequence diagrams, class diagrams, Gantt charts, and more from Mermaid markdown syntax — live preview, light/dark themes, and SVG/PNG export. 100% client-side, no server.
- [nginx config generator](https://onlinetoolsforge.com/en/tools/nginx-config-generator/) — free online tool, runs in your browser
- [git commit message generator](https://onlinetoolsforge.com/en/tools/git-commit-message-generator/): Build Conventional Commits messages with type, scope, subject, body, and breaking-change flags.
- [image comparison slider](https://onlinetoolsforge.com/en/tools/image-comparison-slider/): Compare two images side by side with an interactive draggable before/after slider for portfolios and case studies.
- [image exif remover](https://onlinetoolsforge.com/en/tools/image-exif-remover/): Strip EXIF and GPS metadata from photos client-side for privacy. Re-encodes images in your browser to remove all metadata — no uploads, no servers.
- [startup runway calculator](https://onlinetoolsforge.com/en/tools/startup-runway-calculator/): Calculate how long your startup runway lasts from cash on hand, monthly burn rate, and recurring revenue. See runway in months, weeks, days, and your projected out-of-cash date. 100% client-side and free.
- [yaml diff](https://onlinetoolsforge.com/en/tools/yaml-diff/): Compare two YAML documents semantically and highlight every added, removed, and changed key with full paths. Handles nested maps, arrays, and anchors. 100% client-side, no upload.
- [js obfuscator](https://onlinetoolsforge.com/en/tools/js-obfuscator/): Obfuscate JavaScript source with identifier mangling, string encoding, comment stripping, and whitespace compaction — 100% in-browser, no uploads.
- [audio trimmer](https://onlinetoolsforge.com/en/tools/audio-trimmer/): Trim and cut audio files in your browser with the Web Audio API. Set start and end points, preview the selection, and export a WAV file — no uploads, no sign-up.
- [pdf compressor](https://onlinetoolsforge.com/en/tools/pdf-compressor/): Reduce PDF file size in-browser by packing objects into compressed streams and stripping unused metadata. 100% client-side — your files never leave your browser.
- [pdf metadata editor](https://onlinetoolsforge.com/en/tools/pdf-metadata-editor/): View and edit PDF title, author, subject, keywords, and creation dates in-browser via pdf-lib, then download the updated file. 100% client-side.
- [numeronym generator](https://onlinetoolsforge.com/en/tools/numeronym-generator/): Abbreviate words as numeronyms like i18n for internationalization. Batch convert a list of words with custom minimum length and case handling.
- [html alt text checker](https://onlinetoolsforge.com/en/tools/html-alt-text-checker/): Scan HTML for images missing alt text, empty alt, or broken img/src attributes. Get a clear accessibility report with line numbers, severity, and exportable results.
- [aria label checker](https://onlinetoolsforge.com/en/tools/aria-label-checker/): Scan pasted HTML for missing labels, invalid ARIA usage, and landmark accessibility issues entirely in your browser.
- [string obfuscator](https://onlinetoolsforge.com/en/tools/string-obfuscator/): Partially mask sensitive strings like tokens, IBANs, and credit card numbers into safe shareable forms. Choose mask character, visible characters, and grouping.
- [bbcode to html converter](https://onlinetoolsforge.com/en/tools/bbcode-to-html-converter/): Convert BBCode forum markup to clean HTML with live preview.
- [eta calculator](https://onlinetoolsforge.com/en/tools/eta-calculator/): Calculate estimated completion time (ETA) from a start time and duration with timezone-aware results. Shows exact end time, countdown, ISO 8601, and Unix timestamp.
- [cbor encoder decoder](https://onlinetoolsforge.com/en/tools/cbor-encoder-decoder/): Encode and decode CBOR (Concise Binary Object Representation, RFC 8949), the binary JSON format used in WebAuthn and IoT.
- [subtitle format converter](https://onlinetoolsforge.com/en/tools/subtitle-format-converter/): Convert between SRT, WebVTT, and ASS/SSA subtitle formats with timing and text preserved. Auto-detects input format and works entirely in-browser.
- [subtitle sync shifter](https://onlinetoolsforge.com/en/tools/subtitle-sync-shifter/): Shift all SRT/VTT subtitle timestamps by a fixed offset or linear rescale to fix out-of-sync subtitle files, 100% in-browser.
- [bip39 mnemonic generator](https://onlinetoolsforge.com/en/tools/bip39-mnemonic-generator/): Generate BIP39 seed phrases (12/15/18/21/24 words) with cryptographic checksums using the official English wordlist. Validate phrases and derive wallet seeds, all in-browser.
- [http cache header generator](https://onlinetoolsforge.com/en/tools/http-cache-header-generator/): Build Cache-Control, ETag, and conditional request headers with presets for static assets, APIs, and SPA flows.
- [cagr calculator](https://onlinetoolsforge.com/en/tools/cagr-calculator/): Compute Compound Annual Growth Rate (CAGR) from an initial value, final value, and time period to measure annualized investment returns.
- [yaml to properties converter](https://onlinetoolsforge.com/en/tools/yaml-to-properties-converter/): Convert YAML config files into Java .properties key=value format and back. Handles nested keys, arrays, and escape sequences entirely in-browser.
- [json to querystring converter](https://onlinetoolsforge.com/en/tools/json-to-querystring-converter/): Convert JSON objects into URL query strings with proper percent-encoding, bracket/dot notation for nested keys, and array support. 100% in-browser.
- [security headers generator](https://onlinetoolsforge.com/en/tools/security-headers-generator/): Generate HTTP security headers (CSP, HSTS, X-Frame-Options, Referrer-Policy, Permissions-Policy) with copy-paste nginx, Apache, Express, Caddy, and Cloudflare Pages presets. 100% in-browser.
- [css scrollbar generator](https://onlinetoolsforge.com/en/tools/css-scrollbar-generator/): Free online CSS scrollbar generator. Style scrollbar-width, scrollbar-color, and ::-webkit-scrollbar rules with a live preview and copy-ready CSS. 100% client-side.
- [css scroll snap generator](https://onlinetoolsforge.com/en/tools/css-scroll-snap-generator/): Free online CSS scroll-snap generator. Build scroll-snap-type and scroll-snap-align rules with mandatory/proximity strictness, live preview, and copy-ready CSS. 100% client-side.
- [credit card generator](https://onlinetoolsforge.com/en/tools/credit-card-generator/): Free online test credit card number generator. Generate valid Luhn-checksum test card numbers for Visa, Mastercard, Amex, Discover, JCB, and more for QA and sandbox testing. 100% client-side.
- [openapi to postman converter](https://onlinetoolsforge.com/en/tools/openapi-to-postman-converter/): Convert OpenAPI 3.x and Swagger 2.0 JSON specs into Postman Collection v2.1 JSON, ready to import directly into Postman.
- [pixel art generator](https://onlinetoolsforge.com/en/tools/pixel-art-generator/): Draw pixel art on a customizable grid and export as PNG or SVG with palette support, fill, eraser, and eyedropper tools.
- [html email template generator](https://onlinetoolsforge.com/en/tools/html-email-template-generator/): Build responsive table-based HTML email templates with inline CSS for Outlook and Gmail compatibility. Live preview and export-ready code.
- [ideal weight calculator](https://onlinetoolsforge.com/en/tools/ideal-weight-calculator/): Estimate ideal body weight using Devine, Hamwi, Robinson, and Miller formulas. Supports metric and imperial units with side-by-side formula comparison.
- [json to ini converter](https://onlinetoolsforge.com/en/tools/json-to-ini-converter/): Convert JSON configuration objects to INI format and back. Supports sections, nested objects, comments, and quoting — all in-browser.
- [k map solver](https://onlinetoolsforge.com/en/tools/k-map-solver/): Solve and minimize Boolean expressions on 2–4 variable Karnaugh maps with grouped prime implicants, generated via the Quine–McCluskey algorithm — all in-browser.
- [truth table generator](https://onlinetoolsforge.com/en/tools/truth-table-generator/): Generate truth tables from Boolean expressions with AND, OR, NOT, XOR, NAND, and NOR operators — instantly, in your browser.
- [boolean expression simplifier](https://onlinetoolsforge.com/en/tools/boolean-expression-simplifier/) — free online tool, runs in your browser
- [pwa manifest generator](https://onlinetoolsforge.com/en/tools/pwa-manifest-generator/): Generate a web app manifest.json for Progressive Web Apps with theme colors, display modes, icons, orientation, and shortcuts.
- [probability calculator](https://onlinetoolsforge.com/en/tools/probability-calculator/): Calculate probabilities for normal, binomial, and Poisson distributions plus Bayes theorem. Compute PDF, CDF, PMF, cumulative probabilities, z-scores, and posterior probability. 100% client-side.
- [molar mass calculator](https://onlinetoolsforge.com/en/tools/molar-mass-calculator/): Calculate molecular weight (molar mass) from any chemical formula using the full periodic table of atomic masses. Supports groups, hydrates, and multi-element compounds with mass percent breakdown.
- [chemical equation balancer](https://onlinetoolsforge.com/en/tools/chemical-equation-balancer/): Balance chemical equations automatically using linear algebra on atom counts. Supports parentheses groups, multi-term reactions, and produces the smallest whole-number coefficients. 100% client-side.
- [hreflang tag generator](https://onlinetoolsforge.com/en/tools/hreflang-tag-generator/): Generate hreflang annotation tags for multi-language SEO with x-default support.
- [text summarizer](https://onlinetoolsforge.com/en/tools/text-summarizer/): Extractive text summarization that pulls the most important sentences from a passage.
- [one rep max calculator](https://onlinetoolsforge.com/en/tools/one-rep-max-calculator/) — free online tool, runs in your browser
- [complex number calculator](https://onlinetoolsforge.com/en/tools/complex-number-calculator/): Add, subtract, multiply, and divide complex numbers (a + bi). Compute modulus, argument, conjugate, reciprocal, and square with step-by-step results.
- [base62 converter](https://onlinetoolsforge.com/en/tools/base62-converter/): Encode and decode Base62 text using the alphanumeric 0-9, a-z, A-Z alphabet. URL-safe, no symbols - ideal for short URLs and compact IDs. 100% client-side.
- [background pattern generator](https://onlinetoolsforge.com/en/tools/background-pattern-generator/): Generate seamless CSS background patterns (stripes, dots, checkerboard, grid) with a live preview and copy-paste code. 100% client-side, no sign-up.
- [rate limit calculator](https://onlinetoolsforge.com/en/tools/rate-limit-calculator/): Free API Rate Limit Calculator. Convert server quota, burst, and window into safe per-second rates, client-side throttling delays, token-bucket capacity, and Retry-After hints. 100% client-side, no signup.
- [subscription auditor](https://onlinetoolsforge.com/en/tools/subscription-auditor/): Free Subscription Auditor. List your recurring subscriptions and tally monthly/yearly cost across currencies with upcoming billing reminders. All data stays local in your browser. No signup.
- [dividend calculator](https://onlinetoolsforge.com/en/tools/dividend-calculator/): Free Dividend Calculator. Calculate dividend yield, annual income, and project DRIP reinvestment growth from shares held and payout per share. 100% in-browser.
- [crypto profit calculator](https://onlinetoolsforge.com/en/tools/crypto-profit-calculator/): Free Crypto Profit Calculator. Compute crypto profit/loss and ROI from buy price, sell price, fees, and quantity entirely in-browser.
- [asset allocation calculator](https://onlinetoolsforge.com/en/tools/asset-allocation-calculator/): Free Asset Allocation Calculator. Suggest stock/bond/cash allocation by age or risk tolerance with a dollar breakdown and 10-year projection. 100% in-browser.
- [cookie consent banner generator](https://onlinetoolsforge.com/en/tools/cookie-consent-banner-generator/): Free Cookie Consent Banner Generator. Build GDPR/CCPA-compliant cookie consent banners with customizable message, buttons, position, and theme. Copy-paste HTML, CSS, and JavaScript. 100% in-browser.
- [json to sql converter](https://onlinetoolsforge.com/en/tools/json-to-sql-converter/): Free JSON to SQL Converter. Convert JSON arrays into SQL INSERT statements with inferred column types and optional CREATE TABLE output. Supports MySQL, PostgreSQL, SQLite. 100% in-browser.
- [critical css generator](https://onlinetoolsforge.com/en/tools/critical-css-generator/): Free Critical CSS Generator. Extract CSS rules matching pasted above-the-fold HTML for faster first paint and better Core Web Vitals. Runs entirely in your browser.
- [impedance calculator](https://onlinetoolsforge.com/en/tools/impedance-calculator/): Free online Impedance Calculator. Compute AC impedance of series and parallel RLC circuits from resistance, inductance, capacitance, and frequency. Get magnitude, phase angle, and reactances. 100% client-side.
- [csv transposer](https://onlinetoolsforge.com/en/tools/csv-transposer/): Free online CSV Transposer. Swap rows and columns in CSV data instantly. Supports comma, tab, semicolon, and pipe delimiters. Handles quoted fields and ragged rows. 100% client-side.
- [pkce challenge generator](https://onlinetoolsforge.com/en/tools/pkce-challenge-generator/): Free online PKCE Challenge Generator. Generate OAuth 2.0 PKCE code_verifier and code_challenge (S256/plain) pairs in-browser via Web Crypto API. RFC 7636 compliant.
- [phone number formatter](https://onlinetoolsforge.com/en/tools/phone-number-formatter/): Free online Phone Number Formatter. Format phone numbers to E.164, RFC 3966, and international formats for 45+ countries, with auto country detection. 100% client-side.
- [recipe scaler](https://onlinetoolsforge.com/en/tools/recipe-scaler/): Free online Recipe Scaler. Recalculate recipe ingredient amounts for a different number of servings with fraction support and smart kitchen-friendly rounding. 100% client-side.
- [citation generator](https://onlinetoolsforge.com/en/tools/citation-generator/): Free online Citation Generator. Create APA 7, MLA 9, and Chicago citations for websites, books, and journal articles with automatic author formatting. 100% client-side.
- [typography scale generator](https://onlinetoolsforge.com/en/tools/typography-scale-generator/): Build modular type scales with Major Third, Perfect Fourth, and Golden Ratio ratios. Live preview, CSS variables, and Tailwind config export.
- [tally counter](https://onlinetoolsforge.com/en/tools/tally-counter/): A multi-counter tally tool with custom increments, undo, keyboard shortcuts, and local browser persistence for counting tasks.
- [sql to prisma converter](https://onlinetoolsforge.com/en/tools/sql-to-prisma-converter/): Free SQL to Prisma Converter. Convert CREATE TABLE DDL into Prisma schema models with SQL type mapping, primary keys, defaults, unique constraints, and relation detection. 100% in-browser.
- [random team generator](https://onlinetoolsforge.com/en/tools/random-team-generator/): Shuffle a list of names into balanced random teams by team count or team size, with copy and download support.
- [argon2 hash generator](https://onlinetoolsforge.com/en/tools/argon2-hash-generator/): Generate and verify Argon2id password hashes in-browser with tunable memory, time, and parallelism parameters. WebAssembly-powered and private by design.
- [openapi to typescript converter](https://onlinetoolsforge.com/en/tools/openapi-to-typescript-converter/): Free OpenAPI to TypeScript Converter. Convert OpenAPI and Swagger JSON or YAML specifications into TypeScript interfaces and endpoint types entirely in your browser.
- [json to dart converter](https://onlinetoolsforge.com/en/tools/json-to-dart-converter/): Generate Dart model classes from JSON samples with null safety, nested types, and serialization annotations directly in your browser.
- [json to kotlin converter](https://onlinetoolsforge.com/en/tools/json-to-kotlin-converter/): Generate Kotlin data classes from JSON samples with nested types, nullability, and serialization annotations directly in your browser.
- [json to swift converter](https://onlinetoolsforge.com/en/tools/json-to-swift-converter/): Generate Swift Codable structs from JSON samples with nested types, optional properties, and configurable naming directly in your browser.
- [openapi to curl converter](https://onlinetoolsforge.com/en/tools/openapi-to-curl-converter/): Generate copy-paste cURL request examples from OpenAPI or Swagger JSON specifications entirely in-browser.
- [docker compose to kubernetes converter](https://onlinetoolsforge.com/en/tools/docker-compose-to-kubernetes-converter/): Convert Docker Compose YAML services into starter Kubernetes Deployment, Service, and ConfigMap manifests entirely in-browser.
- [json to python converter](https://onlinetoolsforge.com/en/tools/json-to-python-converter/): Generate Python dataclasses or Pydantic models from JSON samples with nested types, Optional fields, and snake_case naming directly in your browser.
- [github actions workflow generator](https://onlinetoolsforge.com/en/tools/github-actions-workflow-generator/): Build GitHub Actions CI/CD workflow YAML with triggers, Node.js matrix, caching, lint, test, build, and Docker ghcr.io deploy steps — all in your browser.
- [savings goal calculator](https://onlinetoolsforge.com/en/tools/savings-goal-calculator/): Calculate how much to save each month (or week, quarter, year) to reach a savings goal, with compound interest, starting balance, and a yearly progress schedule.
- [apy calculator](https://onlinetoolsforge.com/en/tools/apy-calculator/): Calculate APY (annual percentage yield) from a nominal interest rate and any compounding frequency, with an effective-rate comparison table for daily, weekly, monthly, and more.
- [debt payoff calculator](https://onlinetoolsforge.com/en/tools/debt-payoff-calculator/): Compare debt snowball vs avalanche payoff strategies across multiple debts with payoff dates and total interest paid, entirely in your browser.
- [xml formatter](https://onlinetoolsforge.com/en/tools/xml-formatter/): Format, validate, and minify XML with configurable indentation and syntax error locations directly in your browser.
- [editorconfig generator](https://onlinetoolsforge.com/en/tools/editorconfig-generator/): Generate .editorconfig files with shared indentation, line-ending, charset, and trimming rules for consistent code style across editors and teams.
- [heading structure checker](https://onlinetoolsforge.com/en/tools/heading-structure-checker/): Analyze pasted HTML for heading hierarchy issues: H1-H6 outline, skipped levels, duplicate H1, and empty headings. Ensure accessible document structure for screen readers and SEO.
- [rent vs buy calculator](https://onlinetoolsforge.com/en/tools/rent-vs-buy-calculator/): Compare the lifetime cost of renting vs buying a home with mortgage amortization, appreciation, taxes, maintenance, and investment opportunity cost.
- [rental yield calculator](https://onlinetoolsforge.com/en/tools/rental-yield-calculator/): Calculate gross rental yield, net yield, cap rate, and cash-on-cash return from property price, rent, and expenses with mortgage financing included.
- [dead pixel test](https://onlinetoolsforge.com/en/tools/dead-pixel-test/): Free online dead pixel test. Full-screen solid colors, gradients, and gray sweeps to spot dead or stuck pixels on any display. Works entirely in your browser — no install, no upload.
- [image grid splitter](https://onlinetoolsforge.com/en/tools/image-grid-splitter/): Free online image grid splitter. Slice any photo into an N×M grid of tiles for Instagram grid posts, download individually or as a ZIP — runs entirely in your browser.
- [bulk url opener](https://onlinetoolsforge.com/en/tools/bulk-url-opener/): Free bulk URL opener. Paste a list of links and open them all in new tabs at once with dedupe, batch-size controls, and popup-blocker friendly pacing.
- [thai id validator](https://onlinetoolsforge.com/en/tools/thai-id-validator/): Free Thai National ID validator. Verify 13-digit Thai citizen ID numbers with checksum verification and per-digit breakdown.
- [thai baht text converter](https://onlinetoolsforge.com/en/tools/thai-baht-text-converter/): Free Number to Thai Baht Text converter. Convert any amount into Thai baht words (บาท/สตางค์) for invoices, cheques, and receipts. 100% client-side.
- [buddhist era converter](https://onlinetoolsforge.com/en/tools/buddhist-era-converter/): Free Buddhist Era (พ.ศ.) to Gregorian (ค.ศ./CE) converter. Convert Thai Buddhist years and dates to AD years and back — always exactly 543 years apart. 100% client-side.
- [regex railroad diagram generator](https://onlinetoolsforge.com/en/tools/regex-railroad-diagram-generator/): Visualize regular expressions as interactive railroad (syntax) diagrams. Parse, spot nested groups, classes, and quantifiers at a glance — instantly, in your browser.
- [ipv6 expander](https://onlinetoolsforge.com/en/tools/ipv6-expander/): Expand compressed IPv6 addresses to full 8-group form and compress them back to canonical RFC 5952 notation — with validation, address type detection, and a per-group breakdown, all in your browser.
- [military time converter](https://onlinetoolsforge.com/en/tools/military-time-converter/): Convert between 24-hour military time and 12-hour AM/PM clock format with a live current-time display, spoken military forms, and a printable 24-hour conversion chart.
- [graphql formatter](https://onlinetoolsforge.com/en/tools/graphql-formatter/): Format and validate GraphQL queries, mutations, and schemas with configurable indentation, or minify them for compact transport.
- [file type detector](https://onlinetoolsforge.com/en/tools/file-type-detector/): Identify the real file type from magic-byte signatures entirely in your browser. Detect fake or mismatched extensions, view the file header bytes, and verify what a file actually is before opening it.
- [tone generator](https://onlinetoolsforge.com/en/tools/tone-generator/): Free online audio tone generator with sine, square, sawtooth, and triangle waveforms. Adjustable frequency (20 Hz - 20 kHz), volume control, and musical note presets. Powered by the Web Audio API, works entirely in your browser.
- [dog age calculator](https://onlinetoolsforge.com/en/tools/dog-age-calculator/) — free online tool, runs in your browser
- [signature maker](https://onlinetoolsforge.com/en/tools/signature-maker/): Free online signature maker to draw or type a personal signature and export it as a transparent PNG for email signatures and documents. Works entirely in your browser with no uploads.
- [decibel meter](https://onlinetoolsforge.com/en/tools/decibel-meter/): Free online decibel meter that measures ambient sound level in dB via your microphone using the Web Audio API, with live level meter, peak/average stats, and SPL estimation. Works entirely in your browser.
- [pug to html converter](https://onlinetoolsforge.com/en/tools/pug-to-html-converter/): Free online Pug (Jade) to HTML converter with an indentation-aware compiler that runs entirely in your browser. Supports tags, ids, classes, attributes, block expansion, piped text, comments, doctype, and more.
- [jira to markdown converter](https://onlinetoolsforge.com/en/tools/jira-to-markdown-converter/): Free online Jira wiki markup to Markdown converter (and back) that runs entirely in your browser. Handles headings, bold/italic, code blocks, panels, quotes, tables, links, images, lists, and macros for clean GitHub-flavored Markdown.
- [avro schema generator](https://onlinetoolsforge.com/en/tools/avro-schema-generator/): Generate Apache Avro record schemas from JSON samples with inferred types, logical types (uuid, timestamp-millis), and nullable unions.
- [css logical properties converter](https://onlinetoolsforge.com/en/tools/css-logical-properties-converter/): Free online CSS logical properties converter. Map physical CSS (margin-top, padding-left, border-right) to logical equivalents (margin-block-start, padding-inline-start) for LTR/RTL and vertical writing modes. 100% client-side.
- [sunrise sunset calculator](https://onlinetoolsforge.com/en/tools/sunrise-sunset-calculator/): Free online sunrise and sunset calculator. Compute sunrise, sunset, solar noon, dawn, dusk, and golden hour times for any date, latitude, and longitude offline using the NOAA solar algorithm. 100% client-side.
- [mojibake fixer](https://onlinetoolsforge.com/en/tools/mojibake-fixer/): Repair garbled mojibake text by re-decoding between UTF-8, Latin-1, Windows-1252, Shift-JIS, and TIS-620. Auto-detects the likely encoding pair entirely in your browser.
- [tire size calculator](https://onlinetoolsforge.com/en/tools/tire-size-calculator/): Compare two tire sizes: overall diameter, section width, circumference, revolutions, and speedometer error. Supports metric 225/45R17 and flotation 31x10.50R15 codes.
- [email signature generator](https://onlinetoolsforge.com/en/tools/email-signature-generator/): Build a professional HTML email signature with name, title, photo, and social links. Copy-paste into Gmail or Outlook. Table-based, inline CSS, 100% client-side.
- [date format converter](https://onlinetoolsforge.com/en/tools/date-format-converter/): Convert dates between ISO 8601, DD/MM/YYYY, MM-DD-YY, Unix timestamps, and custom token formats with validation.
- [calendar link generator](https://onlinetoolsforge.com/en/tools/calendar-link-generator/): Generate Add to Calendar links for Google, Outlook, and Yahoo plus a downloadable ICS file from event details. Runs entirely in your browser.
- [sample size calculator](https://onlinetoolsforge.com/en/tools/sample-size-calculator/): Compute A/B test sample size per variant from baseline conversion rate, MDE, significance, and power. Runs entirely in your browser.
- [week number calculator](https://onlinetoolsforge.com/en/tools/week-number-calculator/): Convert Gregorian dates to ISO-8601 week numbers and ISO week-year/week values back to Monday–Sunday date ranges.
- [macro calculator](https://onlinetoolsforge.com/en/tools/macro-calculator/): Calculate daily calorie, protein, carbohydrate, and fat targets from body weight, activity level, and goal using the Mifflin-St Jeor equation.
- [css nth child generator](https://onlinetoolsforge.com/en/tools/css-nth-child-generator/): Build and preview CSS :nth-child, :nth-of-type, and An+B selector formulas against a live grid of elements. Copy the generated rule in your browser.
- [ufw rules generator](https://onlinetoolsforge.com/en/tools/ufw-rules-generator/): Generate Ubuntu ufw allow, deny, reject, and limit commands plus port-range rules with copy-paste ready syntax.
- [css to scss converter](https://onlinetoolsforge.com/en/tools/css-to-scss-converter/): Convert flat CSS into nested SCSS with selector merging and optional color variable extraction, entirely in your browser.
- [imei checker](https://onlinetoolsforge.com/en/tools/imei-checker/): Validate 15-digit IMEI numbers with the Luhn checksum and decode TAC reporting body and serial info. Runs entirely in your browser.
- [paper size converter](https://onlinetoolsforge.com/en/tools/paper-size-converter/): Convert ISO A/B/C, US Letter/Legal, and ANSI paper sizes to millimetres, inches, points, and pixels. Runs entirely in your browser.
- [interval timer](https://onlinetoolsforge.com/en/tools/interval-timer/): Build custom HIIT and Tabata interval timers with prepare, work, rest, and rounds, plus Web Audio beeps. Runs entirely in your browser.
- [graph paper generator](https://onlinetoolsforge.com/en/tools/graph-paper-generator/): Generate printable graph, dot grid, isometric, and hexagonal paper as PNG or PDF with custom spacing and margins. Runs entirely in your browser.
- [golden ratio calculator](https://onlinetoolsforge.com/en/tools/golden-ratio-calculator/): Compute golden-ratio complements, split a length into major and minor parts, and see Fibonacci approximations of phi. Runs entirely in your browser.
- [text to braille translator](https://onlinetoolsforge.com/en/tools/text-to-braille-translator/): Translate text to Grade 1 Unicode Braille and back, with numbers, capitals, and punctuation. Runs entirely in your browser.
- [unused css finder](https://onlinetoolsforge.com/en/tools/unused-css-finder/): Paste HTML and CSS to find unused selectors, estimate byte savings, and copy a used-only stylesheet. Runs entirely in your browser.
- [steganography tool](https://onlinetoolsforge.com/en/tools/steganography-tool/): Hide secret text inside a PNG with LSB steganography and extract it back in your browser. No upload to a server.
- [css spinner generator](https://onlinetoolsforge.com/en/tools/css-spinner-generator/): Build pure-CSS loading spinners with size, color, speed, and style presets, then copy HTML and CSS. Runs entirely in your browser.
- [skeleton loader generator](https://onlinetoolsforge.com/en/tools/skeleton-loader-generator/): Create skeleton loading placeholders for cards, lists, profiles, and articles with shimmer CSS. Copy HTML and CSS in your browser.
- [css tooltip generator](https://onlinetoolsforge.com/en/tools/css-tooltip-generator/): Build pure CSS tooltips with position, arrow, colors, and hover or focus triggers. Live preview with copy-paste HTML and CSS.
- [llms txt generator](https://onlinetoolsforge.com/en/tools/llms-txt-generator/): Generate an llms.txt (and llms-full.txt) file for AI agents from page names, URLs, and descriptions — entirely client-side.
- [mcp config generator](https://onlinetoolsforge.com/en/tools/mcp-config-generator/): Generate mcpServers JSON config blocks (command, args, env) for Claude Desktop, Cursor, and VS Code from server definitions — entirely client-side.
- [sql insert to json converter](https://onlinetoolsforge.com/en/tools/sql-insert-to-json-converter/): Parse SQL INSERT statements back into JSON arrays, grouped objects, or CSV rows with type inference, multi-table support, and issue reporting — entirely client-side.
- [ssh config generator](https://onlinetoolsforge.com/en/tools/ssh-config-generator/): Generate SSH config Host entries from hostname, user, port, key, and jump-host options with copy-paste output.
- [dkim record generator](https://onlinetoolsforge.com/en/tools/dkim-record-generator/): Build and validate DKIM DNS TXT records from a pasted public key with automatic 255-character chunk splitting for DNS providers.
- [gps coordinate converter](https://onlinetoolsforge.com/en/tools/gps-coordinate-converter/): Convert GPS coordinates between decimal degrees, DMS (degrees minutes seconds), and DDM (degrees decimal minutes) formats instantly in your browser.
- [snowflake id decoder](https://onlinetoolsforge.com/en/tools/snowflake-id-decoder/): Decode Discord, Twitter/X, and Instagram Snowflake IDs into creation timestamps, worker IDs, and sequence numbers entirely in your browser.
- [uuid decoder](https://onlinetoolsforge.com/en/tools/uuid-decoder/): Parse UUID versions and variants, and extract timestamps from time-based UUID v1, v6, and v7 values entirely in your browser.
- [mongodb objectid decoder](https://onlinetoolsforge.com/en/tools/mongodb-objectid-decoder/): Decode MongoDB ObjectIds into creation timestamps, random values, and counters, and build date-range query boundary ObjectIds — all in your browser.
- [security txt generator](https://onlinetoolsforge.com/en/tools/security-txt-generator/): Generate RFC 9116 security.txt files for /.well-known/security.txt with contacts, encryption, policy, and expiry fields — all in your browser.
- [rss feed generator](https://onlinetoolsforge.com/en/tools/rss-feed-generator/): Build valid RSS 2.0 and Atom 1.0 feeds from channel metadata and item lists with live XML preview, validation warnings, and download.
- [serp snippet preview](https://onlinetoolsforge.com/en/tools/serp-snippet-preview/): Preview how your page title, URL, and meta description appear in Google search results with pixel-width truncation estimates for desktop and mobile.
- [har file analyzer](https://onlinetoolsforge.com/en/tools/har-file-analyzer/): Load a HAR network capture and get a request waterfall, slowest requests, status-code breakdown, and total transfer size, all client-side.
- [har to curl converter](https://onlinetoolsforge.com/en/tools/har-to-curl-converter/): Convert Chrome or Firefox HAR network captures into copy-paste cURL commands with optional header, cookie, and auth masking.
- [height converter](https://onlinetoolsforge.com/en/tools/height-converter/): Free online height converter. Convert height and length between centimeters, meters, millimeters, feet, inches, and yards instantly, with an all-units table and copy support. 100% client-side.
- [iso 8601 duration converter](https://onlinetoolsforge.com/en/tools/iso-8601-duration-converter/): Free online ISO 8601 duration converter. Parse durations like PT1H30M into total seconds, minutes, and human-readable text, or build valid duration strings from years down to seconds. 100% client-side.
- [issn validator](https://onlinetoolsforge.com/en/tools/issn-validator/): Validate ISSN-8 checksums and convert between ISSN and ISSN-EAN-13 (977 prefix).
- [swift bic validator](https://onlinetoolsforge.com/en/tools/swift-bic-validator/): Validate SWIFT/BIC codes per ISO 9362 and decode bank, country, location, and branch parts.
- [caddyfile generator](https://onlinetoolsforge.com/en/tools/caddyfile-generator/): Generate production-ready Caddyfile configs for reverse proxy, static sites, PHP-FPM, and load balancing with automatic HTTPS, gzip, HSTS, and WebSocket support.
- [clothing size converter](https://onlinetoolsforge.com/en/tools/clothing-size-converter/): Convert clothing sizes between US, UK, EU, IT, JP, and AU systems for tops, dresses, and pants.
- [blurhash generator](https://onlinetoolsforge.com/en/tools/blurhash-generator/): Encode images into compact BlurHash placeholder strings and decode BlurHash codes back into a live canvas preview.
- [permissions policy generator](https://onlinetoolsforge.com/en/tools/permissions-policy-generator/): Build Permissions-Policy HTTP headers that allow or block camera, geolocation, payment, and other browser features per origin, with nginx, Apache, and Express presets. 100% in-browser.
- [ical rrule generator](https://onlinetoolsforge.com/en/tools/ical-rrule-generator/): Build RFC 5545 RRULE recurrence strings for iCal events with daily, weekly, monthly, and yearly patterns plus a human-readable schedule preview.
- [gtin validator](https://onlinetoolsforge.com/en/tools/gtin-validator/): Free online GTIN validator. Check GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13), and GTIN-14 check digits, decode the packaging indicator digit, and identify the GS1 prefix country. 100% client-side.
- [hijri gregorian converter](https://onlinetoolsforge.com/en/tools/hijri-gregorian-converter/): Free Hijri to Gregorian date converter. Convert Islamic calendar dates (AH) to Gregorian (CE) and back with weekday and Hijri month names, plus an Islamic New Year reference table. 100% client-side.
- [html to pug converter](https://onlinetoolsforge.com/en/tools/html-to-pug-converter/): Convert HTML markup into clean Pug (Jade) template syntax instantly. Free online HTML to Pug converter with indentation control, class/id shorthand, comment handling, and 100% in-browser processing.
- [json to jsdoc converter](https://onlinetoolsforge.com/en/tools/json-to-jsdoc-converter/): Generate JSDoc @typedef blocks from JSON samples with nested @property tags, nullable field flags, and array element types.
- [ethereum unit converter](https://onlinetoolsforge.com/en/tools/ethereum-unit-converter/): Convert between Wei, Gwei, ETH and other Ethereum denominations with exact integer-safe BigInt math and a live all-units table.
- [excel formula beautifier](https://onlinetoolsforge.com/en/tools/excel-formula-beautifier/): Expand and indent complex Excel formulas across multiple lines for easier reading and debugging, entirely client-side.
- [hsts header generator](https://onlinetoolsforge.com/en/tools/hsts-header-generator/): Build Strict-Transport-Security (HSTS) headers with max-age, includeSubDomains, and preload, a preload-readiness checklist, and copy-paste nginx, Apache, and Express snippets. 100% in-browser.
- [fire calculator](https://onlinetoolsforge.com/en/tools/fire-calculator/): Estimate your years to financial independence (FIRE) from annual expenses, savings rate, and current savings using the 4% safe withdrawal rule, with milestones and a year-by-year projection table.
- [tsconfig generator](https://onlinetoolsforge.com/en/tools/tsconfig-generator/): Generate a production-ready tsconfig.json from Next.js, Vite, Node.js, and library presets, with strict flags, JSX handling, path aliases, module resolution, and include/exclude globs — copy or download instantly, 100% in your browser.
- [eslint config generator](https://onlinetoolsforge.com/en/tools/eslint-config-generator/): Generate a modern ESLint 9 flat config (eslint.config.js) for React, Next.js, Vue, and Node with TypeScript, Prettier, react-hooks, and Vitest toggles — copy or download instantly, 100% in your browser.
- [caa record generator](https://onlinetoolsforge.com/en/tools/caa-record-generator/) — free online tool, runs in your browser
- [faq schema generator](https://onlinetoolsforge.com/en/tools/faq-schema-generator/): Free online FAQ schema generator. Build FAQPage JSON-LD structured data from question and answer pairs with live preview, validation warnings, and a copy-paste script tag for Google rich results.
- [referrer policy generator](https://onlinetoolsforge.com/en/tools/referrer-policy-generator/): Build Referrer-Policy headers from all 8 W3C directives with a per-scenario leak breakdown showing exactly what referrer data leaves your site, plus copy-paste nginx, Apache, Express, and meta tag snippets. 100% in-browser.
- [pem certificate decoder](https://onlinetoolsforge.com/en/tools/pem-certificate-decoder/): Decode pasted X.509 PEM certificates and CSRs in your browser. Shows subject, issuer, SANs, validity dates, serial number, and public key type — no upload required.
- [css mesh gradient generator](https://onlinetoolsforge.com/en/tools/css-mesh-gradient-generator/): Build multi-point mesh-style CSS gradients with live preview and copy-paste background code, using modern CSS gradient interpolation.
- [git branch name generator](https://onlinetoolsforge.com/en/tools/git-branch-name-generator/): Turn ticket titles into conventional branch names (feat/, fix/, chore/) with slugify, ticket prefixes, and length limits.
- [business days calculator](https://onlinetoolsforge.com/en/tools/business-days-calculator/): Count working days between two dates, excluding weekends and custom holidays.
- [bimi record generator](https://onlinetoolsforge.com/en/tools/bimi-record-generator/): Free online BIMI record generator. Create BIMI DNS TXT records (v=BIMI1) from your SVG logo URL and optional Verified Mark Certificate (VMC) URL. Builds the exact l= and a= tags to publish at default._bimi.yourdomain.com, validates HTTPS URLs, and explains DMARC prerequisites for Gmail and Apple Mail logo display.
- [mta sts policy generator](https://onlinetoolsforge.com/en/tools/mta-sts-policy-generator/): Generate RFC 8461 MTA-STS DNS TXT records and HTTPS policy files with mode, MX patterns, and max_age for STARTTLS enforcement.
- [email header parser](https://onlinetoolsforge.com/en/tools/email-header-parser/): Parse raw RFC 5322 email headers into readable fields, decode MIME encoded-words, and trace the Received hop chain.
- [tailwind to css converter](https://onlinetoolsforge.com/en/tools/tailwind-to-css-converter/): Expand Tailwind CSS utility class strings into equivalent plain CSS rules in the browser, with variant support for hover, focus, breakpoints, and dark mode.
- [redirect map generator](https://onlinetoolsforge.com/en/tools/redirect-map-generator/): Turn old-to-new URL pairs into nginx, Apache, Netlify, and Vercel redirect configs instantly — all in your browser.
- [cache control header generator](https://onlinetoolsforge.com/en/tools/cache-control-header-generator/): Build Cache-Control headers with max-age, s-maxage, immutable, and stale-while-revalidate — plus ready nginx, Apache, and Express.js snippets.
- [voltage divider calculator](https://onlinetoolsforge.com/en/tools/voltage-divider-calculator/): Free online voltage divider calculator. Compute Vout from Vin, R1, and R2 with current and per-resistor power, model loaded dividers with RL, and reverse-solve R2 for a target voltage with E24 standard values. 100% client-side.
- [depreciation calculator](https://onlinetoolsforge.com/en/tools/depreciation-calculator/): Free online depreciation calculator. Build straight-line, declining-balance (200%, 150%), and sum-of-years-digits schedules from cost, salvage value, and useful life, with year-by-year book value tables and CSV export. 100% client-side.
- [apple app site association generator](https://onlinetoolsforge.com/en/tools/apple-app-site-association-generator/): Generate the apple-app-site-association JSON for iOS Universal Links and Shared Web Credentials. Add app IDs, path rules, and optional webcredentials - fully client-side.
- [helm values validator](https://onlinetoolsforge.com/en/tools/helm-values-validator/): Validate Helm values.yaml against values.schema.json with full JSON Schema draft-07 support. Reports type, required-field, enum, and path errors — 100% client-side.
- [aws iam policy builder](https://onlinetoolsforge.com/en/tools/aws-iam-policy-builder/): Build and validate AWS IAM policy JSON with statements, actions, resources, principals, and condition blocks — 100% client-side.
- [openssl command generator](https://onlinetoolsforge.com/en/tools/openssl-command-generator/): Generate copy-paste openssl commands for CSR creation, self-signed certificates, key and PKCS12 format conversion, and certificate inspection — 100% client-side.
- [cvss score calculator](https://onlinetoolsforge.com/en/tools/cvss-score-calculator/): Build CVSS v3.1 and v4.0 vectors and calculate base severity scores with a plain-language metric breakdown — official FIRST scoring, fully client-side.
- [hash type identifier](https://onlinetoolsforge.com/en/tools/hash-type-identifier/): Identify likely hash algorithms from length, charset, and signature prefixes like bcrypt, Argon2, and sha512crypt — instant, ranked candidates, 100% client-side.
- [dockerfile linter](https://onlinetoolsforge.com/en/tools/dockerfile-linter/): Lint Dockerfiles in your browser for security, caching, and image-size issues with line-level fixes.
- [json repair tool](https://onlinetoolsforge.com/en/tools/json-repair-tool/): Repair malformed JSON in your browser — fix trailing commas, single quotes, comments, unquoted keys, and Python literals with a change preview.
- [t test calculator](https://onlinetoolsforge.com/en/tools/t-test-calculator/) — free online tool, runs in your browser
- [jq playground](https://onlinetoolsforge.com/en/tools/jq-playground/): Run jq filter expressions against pasted JSON entirely in-browser with formatted output, syntax errors, and reusable query examples.
- [paint calculator](https://onlinetoolsforge.com/en/tools/paint-calculator/): Free paint calculator. Estimate how much paint you need from wall dimensions, coats, coverage rate, and waste. Subtracts doors, windows, and custom areas. Imperial and metric units, gallons and liters, cost estimate. 100% client-side.
- [roofing calculator](https://onlinetoolsforge.com/en/tools/roofing-calculator/): Free roofing calculator. Estimate roof surface area from footprint and pitch, get shingle bundles or sheets, underlayment rolls, roofing squares, and cost. Gable and hip roofs, imperial and metric, 100% client-side.
- [tile calculator](https://onlinetoolsforge.com/en/tools/tile-calculator/): Calculate how many tiles you need from surface and tile dimensions, with grout spacing, waste allowance, and box estimates.
- [ratio calculator](https://onlinetoolsforge.com/en/tools/ratio-calculator/): Simplify ratios to lowest terms, solve missing proportion terms, compare two ratios, and scale quantities with equivalent-ratio tables.
- [docker run to compose converter](https://onlinetoolsforge.com/en/tools/docker-run-to-compose-converter/): Convert docker run commands into Docker Compose YAML — ports, volumes, environment variables, networks, and restart policies mapped automatically, 100% client-side.
- [figma design token converter](https://onlinetoolsforge.com/en/tools/figma-design-token-converter/): Convert Figma Tokens or W3C Design Tokens JSON into CSS custom properties, SCSS variables, and Tailwind theme values — alias references resolved automatically, 100% client-side.
- [tailwind class sorter](https://onlinetoolsforge.com/en/tools/tailwind-class-sorter/): Sort Tailwind CSS utility classes into a canonical order with variants and arbitrary values preserved.
- [case style converter](https://onlinetoolsforge.com/en/tools/case-style-converter/): Convert identifiers between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, Title Case, and Train-Case with smart word-splitting for acronyms and digits — 100% client-side.
- [javascript sourcemap explorer](https://onlinetoolsforge.com/en/tools/javascript-sourcemap-explorer/): Inspect a JavaScript bundle and source map to visualize which original files contribute the most bytes without uploading proprietary code.
- [filetime ldap timestamp converter](https://onlinetoolsforge.com/en/tools/filetime-ldap-timestamp-converter/): Convert Windows FILETIME and LDAP/Active Directory 100-nanosecond timestamps to ISO 8601, Unix time, and readable dates — and back. Works fully in-browser with exact BigInt math.
- [pii redactor](https://onlinetoolsforge.com/en/tools/pii-redactor/): Detect and redact emails, phone numbers, credit cards, SSNs, IBANs, IP addresses, and credential/API-key patterns in pasted text — with Luhn validation and redact, mask, or hash modes. Runs fully in-browser.
- [json schema faker](https://onlinetoolsforge.com/en/tools/json-schema-faker/): Generate realistic mock JSON from JSON Schema (Draft 2020-12/2019-09/draft-07) with seeded determinism, format-aware strings, enums, $ref, allOf/anyOf/oneOf, and example/default precedence — entirely in-browser.
- [json schema visualizer](https://onlinetoolsforge.com/en/tools/json-schema-visualizer/): Visualize JSON Schema as an interactive tree with types, required fields, and $ref relationships.
- [zodiac sign calculator](https://onlinetoolsforge.com/en/tools/zodiac-sign-calculator/): Find your Western zodiac sign and Chinese zodiac animal element from your birthdate, with date ranges shown.
- [keyboard focus order checker](https://onlinetoolsforge.com/en/tools/keyboard-focus-order-checker/): Check keyboard focus order in pasted HTML: list the expected tab order, flag positive tabindex, unreachable onclick controls, and aria-hidden focus traps.
- [accessible name calculator](https://onlinetoolsforge.com/en/tools/accessible-name-calculator/): Compute the accessible name of any element from pasted HTML: resolves aria-labelledby chains, aria-label, label associations, alt text, and native semantics per the W3C Accessible Name algorithm.
- [emoji remover](https://onlinetoolsforge.com/en/tools/emoji-remover/): Strip emojis and symbol characters from text for clean CSVs, legacy systems, and LLM prompts, with optional zero-width cleanup, all in-browser.
- [css selector tester](https://onlinetoolsforge.com/en/tools/css-selector-tester/): Test CSS selectors against pasted HTML, highlight matched elements, and catch invalid selectors entirely in-browser.
- [sql schema visualizer](https://onlinetoolsforge.com/en/tools/sql-schema-visualizer/): Paste SQL CREATE TABLE statements and instantly visualize tables, columns, primary and foreign keys as an ER diagram.
- [webauthn data decoder](https://onlinetoolsforge.com/en/tools/webauthn-data-decoder/): Decode WebAuthn passkey registration and authentication payloads: clientDataJSON, attestationObject CBOR, authenticator flags, AAGUID, credential ID and COSE public key — 100% in-browser.
- [jmespath tester](https://onlinetoolsforge.com/en/tools/jmespath-tester/): Free online JMESPath tester. Run JMESPath queries against JSON instantly — filters, projections, multiselect, and functions with clear syntax errors, matched values, and paths. Works offline in your browser.
- [glob tester](https://onlinetoolsforge.com/en/tools/glob-tester/): Free online glob pattern tester. Test glob and minimatch patterns against file paths with include/exclude rules, negation, brace expansion, and character classes — with instant match highlighting. Works offline in your browser.
- [voltage drop calculator](https://onlinetoolsforge.com/en/tools/voltage-drop-calculator/): Free online voltage drop calculator. Estimate DC, single-phase, and three-phase AC voltage drop from AWG wire size, length, current, and material with temperature correction, 3%/5% limit checks, and minimum-AWG recommendations. Works offline in your browser.
- [assetlinks json generator](https://onlinetoolsforge.com/en/tools/assetlinks-json-generator/): Generate the assetlinks.json Digital Asset Links file for Android App Links. Add package names, SHA-256 fingerprints, and optional credential sharing - fully client-side.
- [sleep cycle calculator](https://onlinetoolsforge.com/en/tools/sleep-cycle-calculator/): Find the best bedtime or wake-up time using 90-minute sleep cycles. Adjustable cycle length, fall-asleep buffer, and recommended 5-6 cycle highlights - fully offline.
- [json flattener](https://onlinetoolsforge.com/en/tools/json-flattener/): Flatten nested JSON into dotted, underscored, or bracket-notation keys, and unflatten flat maps back into objects. Supports arrays, custom separators, and type inference.
- [blood glucose converter](https://onlinetoolsforge.com/en/tools/blood-glucose-converter/): Convert blood glucose between mg/dL and mmol/L, classify readings against ADA fasting and post-meal ranges, and estimate HbA1c from average glucose (ADAG formula) — all in your browser.
- [vapid key generator](https://onlinetoolsforge.com/en/tools/vapid-key-generator/): Generate Web Push VAPID key pairs (P-256 ECDSA) in your browser with public and private keys in base64url format.
- [browser feature detector](https://onlinetoolsforge.com/en/tools/browser-feature-detector/): Live-detect which CSS and JavaScript APIs your current browser supports via CSS.supports and feature checks — 55+ features scanned offline
- [breadcrumb schema generator](https://onlinetoolsforge.com/en/tools/breadcrumb-schema-generator/): Free online breadcrumb schema generator. Build BreadcrumbList JSON-LD structured data from page names and URLs with live validation and a copy-paste script tag for Google rich results.
- [apache to nginx converter](https://onlinetoolsforge.com/en/tools/apache-to-nginx-converter/): Convert Apache .htaccess RewriteRule and Redirect directives to nginx location and return rules.
- [pcb trace width calculator](https://onlinetoolsforge.com/en/tools/pcb-trace-width-calculator/): Free online PCB trace width calculator. Size copper traces from current and temperature rise using IPC-2221 formulas for external and internal layers, with copper weight 0.5-4 oz, mil/mm output, trace resistance, voltage drop, and power dissipation. Works offline in your browser.
- [jsonata tester](https://onlinetoolsforge.com/en/tools/jsonata-tester/): Run JSONata queries against pasted JSON entirely in-browser with the official jsonata engine, formatted results, parse/runtime error separation, and reusable examples.
- [jsonl validator](https://onlinetoolsforge.com/en/tools/jsonl-validator/): Validate JSON Lines/NDJSON files row by row, flag broken lines with line numbers, and convert valid records to a JSON array.
- [base64 to image converter](https://onlinetoolsforge.com/en/tools/base64-to-image-converter/): Decode Base64 data URI strings back into viewable images with automatic format detection, size details, and PNG/JPG download.
- [keccak sha3 hash generator](https://onlinetoolsforge.com/en/tools/keccak-sha3-hash-generator/): Generate SHA3-224/256/384/512 and Keccak-256 (Ethereum) hashes of text or files entirely in your browser.
- [bpm tapper](https://onlinetoolsforge.com/en/tools/bpm-tapper/): Free online BPM tapper and tap tempo tool. Tap in rhythm with any song to instantly measure its tempo in beats per minute, with average BPM, interval range, and keyboard tap support. Works fully offline.
- [unit price calculator](https://onlinetoolsforge.com/en/tools/unit-price-calculator/): Compare product prices per kg, liter, ounce, or piece to find the true best value at the supermarket — mixed package sizes supported, 100% offline.
- [date range splitter](https://onlinetoolsforge.com/en/tools/date-range-splitter/): Split any date range into weekly, monthly, or quarterly chunks with day counts for reporting, invoicing, and sprint planning — 100% in-browser.
- [markdown link checker](https://onlinetoolsforge.com/en/tools/markdown-link-checker/): Scan Markdown for malformed links: empty URLs, spaces in URLs, unclosed inline links, undefined reference labels, and duplicate or unused definitions — with line numbers, severity filters, and a plain-text report. 100% client-side.
- [ulid decoder](https://onlinetoolsforge.com/en/tools/ulid-decoder/): Decode ULIDs into their embedded millisecond timestamps, creation dates in any timezone, and 80-bit randomness parts. Validate Crockford Base32 format and batch-decode up to 200 ULIDs at once, fully client-side.
- [led resistor calculator](https://onlinetoolsforge.com/en/tools/led-resistor-calculator/): Free online LED resistor calculator. Find the right current-limiting resistor from supply voltage, LED forward voltage, and target current. Closest E24 standard value, actual current, power dissipation, wattage rating, and 4-band color code. 100% client-side.
- [555 timer calculator](https://onlinetoolsforge.com/en/tools/555-timer-calculator/): Free online 555 timer calculator. Compute astable frequency and duty cycle or monostable pulse width from R and C values, or reverse-solve R1/R2 from a target frequency with E24 standard values. 100% client-side.
- [capacitor code calculator](https://onlinetoolsforge.com/en/tools/capacitor-code-calculator/): Free online capacitor code calculator. Decode 3-digit ceramic capacitor markings (104 = 100nF) to pF/nF/µF and back, with R decimal notation and tolerance letters. 100% client-side.
- [battery life calculator](https://onlinetoolsforge.com/en/tools/battery-life-calculator/): Free online battery life calculator. Estimate device runtime from capacity (mAh/Wh), voltage, and average current draw, with derating, reserve, and load scenario table. 100% client-side.
- [unicode range generator](https://onlinetoolsforge.com/en/tools/unicode-range-generator/): Build CSS unicode-range values and complete @font-face rules for Latin, Thai, and other scripts with live preview.
- [gzip size calculator](https://onlinetoolsforge.com/en/tools/gzip-size-calculator/): Compress text or files with gzip in your browser and compare original and compressed sizes, savings, and download output without uploading data.
- [email obfuscator](https://onlinetoolsforge.com/en/tools/email-obfuscator/): Turn email addresses into spam-proof obfuscated forms - HTML entities, ROT13 document.write, and human-readable [at]/[dot] text with copy-paste snippets.
- [gitattributes generator](https://onlinetoolsforge.com/en/tools/gitattributes-generator/): Generate .gitattributes files that control line endings, mark binaries, silence lockfile diffs, and manage linguist/export-ignore rules.
- [video frame extractor](https://onlinetoolsforge.com/en/tools/video-frame-extractor/): Seek through an uploaded video and capture any frame as a PNG or JPG image via canvas, with frame stepping, exact time jump, and scaling options — entirely in-browser.
- [css font stack generator](https://onlinetoolsforge.com/en/tools/css-font-stack-generator/): Build robust CSS font-family stacks with system-font fallbacks per platform and a live rendered preview. Copy as CSS or a Tailwind config.
- [ovulation calculator](https://onlinetoolsforge.com/en/tools/ovulation-calculator/): Estimate your ovulation day and 6-day fertile window from your last period start and average cycle length. See peak fertility days, next expected period, best pregnancy test day, and projections for the next 3 cycles. Free, private, no signup.
- [agents md generator](https://onlinetoolsforge.com/en/tools/agents-md-generator/): Generate AGENTS.md instruction files for AI coding agents like Claude Code, Cursor, Codex, and GitHub Copilot. Pick sections, fill in commands and conventions, preview live, and download a ready-to-commit AGENTS.md. Free, private, works offline.
- [overtime calculator](https://onlinetoolsforge.com/en/tools/overtime-calculator/): Compute overtime pay from base hourly rate, hours worked, and multiplier rules (1.5x, 2x, 3x) with Thai labor law presets. See per-tier pay, daily total, and monthly estimate — free, private, no signup.
- [thai area converter](https://onlinetoolsforge.com/en/tools/thai-area-converter/): Free Thai Area Converter. Convert rai, ngan, and tarang wa to square meters, square feet, acres, and hectares instantly, with rai-ngan-wa notation breakdowns for land deals. 100% client-side.
- [cost of living calculator](https://onlinetoolsforge.com/en/tools/cost-of-living-calculator/): Free Cost of Living Comparison Calculator. Compare housing, food, transport, healthcare, and everyday costs across 66 cities and see the salary you need to keep your lifestyle, all offline.
- [cpc calculator](https://onlinetoolsforge.com/en/tools/cpc-calculator/): Calculate Cost Per Click (CPC) from ad spend and clicks, or solve required budget and click volume for PPC campaign planning.
- [nginx log analyzer](https://onlinetoolsforge.com/en/tools/nginx-log-analyzer/): Parse nginx and Apache access logs into status, IP, endpoint, bandwidth, and traffic-spike insights entirely in your browser.
- [ieee754 float explorer](https://onlinetoolsforge.com/en/tools/ieee754-float-explorer/): Free online IEEE 754 float visualizer. Decompose any number into binary32/64 sign, exponent, and mantissa bits, toggle individual bits, and see the exact decimal value with rounding error analysis. 100% client-side.
- [xslt transformer](https://onlinetoolsforge.com/en/tools/xslt-transformer/): Free online XSLT transformer. Apply XSLT stylesheets to XML documents and get instant HTML, XML, or text output using the browser built-in XSLTProcessor, with parse error highlighting. 100% client-side and private.
- [regex data generator](https://onlinetoolsforge.com/en/tools/regex-data-generator/): Generate random strings and sample datasets that match any regex pattern — character classes, ranges, alternation, groups, and quantifiers — entirely in your browser for test fixtures.
- [json to excel converter](https://onlinetoolsforge.com/en/tools/json-to-excel-converter/): Convert JSON arrays into downloadable .xlsx Excel spreadsheets with typed number and boolean cells, nested-object flattening, and styled headers — entirely in your browser, no upload.
- [uri template expander](https://onlinetoolsforge.com/en/tools/uri-template-expander/): Free online RFC 6570 URI Template expander. Build REST API URLs from templates like /users/{id}{?fields} with query, path, fragment, and explode operators. Live variable table, copy-paste output, 100% client-side.
- [terraform hcl formatter](https://onlinetoolsforge.com/en/tools/terraform-hcl-formatter/): Format and align Terraform HCL files in-browser like terraform fmt with block indentation and key alignment.
- [sudoku solver](https://onlinetoolsforge.com/en/tools/sudoku-solver/): Free online Sudoku solver and generator. Solve any 9x9 puzzle instantly, check whether the solution is unique, and generate printable easy, medium, or hard puzzles with exactly one solution. 100% in-browser, no upload.
- [moon phase calculator](https://onlinetoolsforge.com/en/tools/moon-phase-calculator/): Free online moon phase calculator. Find the lunar phase for any date with illumination percent, moon age, distance, and exact times of the next new moon, first quarter, full moon, and last quarter — computed offline in your browser.
- [ffmpeg command builder](https://onlinetoolsforge.com/en/tools/ffmpeg-command-builder/): Free online FFmpeg command builder. Generate copy-paste ffmpeg commands for converting, compressing, trimming, GIF-making, audio extraction, and resizing videos — no CLI memorization needed, works offline in your browser.
- [printable calendar generator](https://onlinetoolsforge.com/en/tools/printable-calendar-generator/): Create printable monthly and yearly calendars as PDF or PNG with custom week start, event marking, and ISO week numbers, all client-side.
- [chi square calculator](https://onlinetoolsforge.com/en/tools/chi-square-calculator/): Run chi-square goodness-of-fit and independence (contingency table) tests in your browser — χ² statistic, p-value, degrees of freedom, critical value, standardized residuals, and Cramér\u2019s V.
- [guitar tuner](https://onlinetoolsforge.com/en/tools/guitar-tuner/): Free online guitar tuner with reference tones for 5 tunings and live microphone pitch detection — all in your browser, no install needed.
- [slack export viewer](https://onlinetoolsforge.com/en/tools/slack-export-viewer/): Parse Slack workspace export JSON files in-browser: browse channels, threads, and users in a searchable offline reader with activity stats — no upload.
- [ev charging cost calculator](https://onlinetoolsforge.com/en/tools/ev-charging-cost-calculator/): Estimate EV charging costs from battery kWh, charge level, and electricity tariff with cost-per-100km output and a petrol car comparison — all offline in your browser.
- [excel formula translator](https://onlinetoolsforge.com/en/tools/excel-formula-translator/): Translate Excel formulas to Google Sheets equivalents and back, mapping renamed functions and flagging incompatible ones, entirely in-browser.
- [excel to csv converter](https://onlinetoolsforge.com/en/tools/excel-to-csv-converter/): Convert Excel .xlsx and .xlsm workbooks to CSV or JSON in your browser. Pick any worksheet, choose comma, semicolon, tab, or custom delimiters, no upload needed.
- [github issue template generator](https://onlinetoolsforge.com/en/tools/github-issue-template-generator/): Build GitHub issue templates visually: classic Markdown templates with YAML front matter or structured Issue Forms (YAML) with input, textarea, dropdown, and checkbox fields. Live preview, copy or download, no account needed.
- [solar panel calculator](https://onlinetoolsforge.com/en/tools/solar-panel-calculator/): Size a rooftop solar PV system from monthly kWh usage, peak sun hours, and panel wattage with array size, panel count, roof area, and string configuration — all offline in your browser.
- [vscode snippet generator](https://onlinetoolsforge.com/en/tools/vscode-snippet-generator/): Build VS Code snippets from pasted code with tabstops, placeholders, choices, and variables — valid .code-snippets JSON generated entirely in your browser.
- [gradle to maven converter](https://onlinetoolsforge.com/en/tools/gradle-to-maven-converter/): Convert Gradle Groovy/Kotlin DSL dependencies and plugins into Maven pom.xml snippets in your browser. Maps configurations to scopes, keeps exclusions, and detects version catalog aliases — 100% client-side.
- [markdown chunker](https://onlinetoolsforge.com/en/tools/markdown-chunker/): Split long Markdown documents into token-budget chunks for RAG pipelines and LLM context windows. Markdown-aware splitting that never breaks code blocks or tables, with heading-breadcrumb context, overlap control, and JSONL export — all offline.
- [cursor rules generator](https://onlinetoolsforge.com/en/tools/cursor-rules-generator/): Build .cursor/rules MDC files with description, globs, and alwaysApply frontmatter plus curated rule presets — copy or download ready-to-use rules that steer Cursor AI editing.
- [thai postcode lookup](https://onlinetoolsforge.com/en/tools/thai-postcode-lookup/): Free Thai postal code lookup. Search 7,400+ subdistricts by postcode or name in Thai or English, offline in your browser.
- [photo collage maker](https://onlinetoolsforge.com/en/tools/photo-collage-maker/): Free online photo collage maker. Combine multiple photos into grid collages with drag-and-drop placement, gaps, rounding, and background color — export as PNG, entirely in your browser.
- [msgpack converter](https://onlinetoolsforge.com/en/tools/msgpack-converter/): Convert JSON to MessagePack binary format and back in-browser with hex preview and file download for Redis, IoT, and API payloads.
- [aws arn parser](https://onlinetoolsforge.com/en/tools/aws-arn-parser/): Parse Amazon Resource Names into partition, service, region, account, and resource parts with copyable segments, and build valid ARNs back from components.
- [promptpay qr generator](https://onlinetoolsforge.com/en/tools/promptpay-qr-generator/): Generate Thai PromptPay EMVCo QR codes from citizen ID, phone number, or e-wallet ID with optional amount — fully offline in your browser.
- [sqlite viewer](https://onlinetoolsforge.com/en/tools/sqlite-viewer/): Open .db and .sqlite files in-browser via SQL.js (WebAssembly) and browse tables, run SELECT queries, and export CSV — no upload, no server, works offline.
- [mrz parser](https://onlinetoolsforge.com/en/tools/mrz-parser/): Parse and validate passport MRZ codes (TD3, 2x44) and ID card MRZ (TD1, 3x30) into document number, names, date of birth, expiry, and nationality with ICAO 9303 check digit verification. 100% client-side.
- [stair calculator](https://onlinetoolsforge.com/en/tools/stair-calculator/): Compute riser height, tread depth, number of steps, total run, and stair angle from floor-to-floor height with 2R+T building-code comfort checks, in cm or inches — 100% offline.
- [roas calculator](https://onlinetoolsforge.com/en/tools/roas-calculator/): Calculate Return on Ad Spend (ROAS) from revenue and ad spend, with break-even ROAS from your profit margin for smarter PPC budgeting.
- [clv calculator](https://onlinetoolsforge.com/en/tools/clv-calculator/): Calculate Customer Lifetime Value (CLV) from average order value, purchase frequency, and lifespan, with margin-adjusted CLV, CLV:CAC ratio, and CAC payback.
- [passport photo maker](https://onlinetoolsforge.com/en/tools/passport-photo-maker/): Free online passport photo maker. Crop photos to official ID standards - US passport 2x2in, Schengen 35x45mm, Thai ID, China visa, Japan certificate, Canada - with exact 300/600 DPI print output, face guides, and drag-to-position controls. 100% client-side, no upload.
- [iframe embed generator](https://onlinetoolsforge.com/en/tools/iframe-embed-generator/): Free online iframe embed code generator. Build responsive iframe embeds for YouTube, Vimeo, Google Maps, or any URL with lazy loading, sandbox, referrerpolicy, title, and live preview. 100% client-side.
- [sla uptime calculator](https://onlinetoolsforge.com/en/tools/sla-uptime-calculator/): Convert SLA uptime percentages (99.9%, four nines) into allowed downtime per day, week, month, and year — or measure achieved availability from real downtime. Includes a 99% to 99.999% tier reference table, 100% client-side.
- [screenshot beautifier](https://onlinetoolsforge.com/en/tools/screenshot-beautifier/): Frame screenshots with beautiful gradient backgrounds, padding, rounded corners, soft shadows, and an optional watermark. Export polished PNG/JPEG images for docs, READMEs, and social posts — 100% client-side.
- [image annotator](https://onlinetoolsforge.com/en/tools/image-annotator/): Annotate images in your browser: draw arrows, boxes, freehand, text, highlights, and mosaic blur on screenshots or photos, then export as PNG. 100% client-side, no upload.
- [dew point calculator](https://onlinetoolsforge.com/en/tools/dew-point-calculator/): Compute dew point, relative humidity, absolute humidity, and vapor pressure from temperature using the Magnus-Tetens formula, with a humidity comfort scale. 100% client-side.
- [email normalizer](https://onlinetoolsforge.com/en/tools/email-normalizer/): Normalize email lists in your browser: lowercase, strip Gmail dots and plus-aliases, trim whitespace, and dedupe lines. 100% client-side.
- [safelink decoder](https://onlinetoolsforge.com/en/tools/safelink-decoder/): Decode Microsoft Outlook SafeLink wrapper URLs (safelinks.protection.outlook.com) back to the original destination in your browser, with the region prefix, tracking parameters, and phishing red flags (IP hosts, punycode, deep subdomains, double encoding) shown per link.
- [json to mongoose converter](https://onlinetoolsforge.com/en/tools/json-to-mongoose-converter/): Infer Mongoose schemas with types, refs, and defaults from JSON samples, 100% in-browser.
- [css to js object converter](https://onlinetoolsforge.com/en/tools/css-to-js-object-converter/): Convert CSS declarations into React inline-style objects, plain JS objects, or template literals with camelCase keys, fully in-browser.
- [json graph visualizer](https://onlinetoolsforge.com/en/tools/json-graph-visualizer/): Render nested JSON as an interactive tree with collapsible branches, node stats, JSONPath-style paths, search-free navigation, and text export. 100% client-side.
- [voice recorder](https://onlinetoolsforge.com/en/tools/voice-recorder/): Record your voice or any audio with a live waveform preview using the MediaRecorder API. Pause, resume, and download as WebM or MP4 — 100% in your browser, no uploads.
- [image diff](https://onlinetoolsforge.com/en/tools/image-diff/): Compare two images pixel by pixel and highlight differences with threshold control, side-by-side, difference, and heat-map modes for visual regression checks — all in your browser.
- [exponential backoff calculator](https://onlinetoolsforge.com/en/tools/exponential-backoff-calculator/): Free exponential backoff calculator. Compute retry delay schedules with base interval, multiplier, cap, and jitter (full, equal, or decorrelated), view a retry-by-retry timeline with cumulative wait, and copy ready-to-use Python/JS snippets. 100% client-side.
- [ansi color code generator](https://onlinetoolsforge.com/en/tools/ansi-color-code-generator/): Build ANSI escape codes for 16-color, 256-color, and truecolor text and backgrounds with a live terminal-style preview. Copy raw or \x1b-escaped sequences for scripts, CLIs, and READMEs — free and fully in-browser.
- [bulk qr code generator](https://onlinetoolsforge.com/en/tools/bulk-qr-code-generator/): Generate hundreds of QR codes at once from a pasted list of URLs or text, with numbered or custom filenames, and download them all as a ZIP of PNG files — free and fully in-browser.
- [geojson converter](https://onlinetoolsforge.com/en/tools/geojson-converter/): Convert CSV with latitude/longitude columns into a GeoJSON FeatureCollection in your browser. Geometry validation, delimiter auto-detect, property mapping, and one-click .geojson download — no upload.
- [basic auth generator](https://onlinetoolsforge.com/en/tools/basic-auth-generator/): Build HTTP Basic Auth Authorization headers from a username and password — base64 via UTF-8 or Latin-1, with curl/fetch snippets and an .htpasswd preview. 100% in your browser.
- [html wysiwyg editor](https://onlinetoolsforge.com/en/tools/html-wysiwyg-editor/): Rich-text WYSIWYG editor with a contentEditable toolbar (bold, lists, links, headings, tables of formatting) plus a live HTML source view and clean-HTML export. 100% client-side.
- [terms of service generator](https://onlinetoolsforge.com/en/tools/terms-of-service-generator/): Generate a Terms of Service / Terms of Use page from company name, service description, governing law, and optional clauses (accounts, payments, user content, dispute resolution). Copy-paste HTML output. 100% client-side.
- [vcard parser](https://onlinetoolsforge.com/en/tools/vcard-parser/): Parse .vcf vCard files (2.1/3.0/4.0) into readable contacts - name, org, phones, emails, URLs, addresses, birthday, and photo. Edit fields and export back to vCard 3.0/4.0. Fully offline in your browser.
- [markdown mindmap](https://onlinetoolsforge.com/en/tools/markdown-mindmap/): Turn Markdown headings and lists into an interactive, collapsible mind map. Click branches to expand or collapse, then export the map as SVG - entirely in your browser.
- [ipv6 ula generator](https://onlinetoolsforge.com/en/tools/ipv6-ula-generator/): Generate RFC 4193 IPv6 Unique Local Addresses (fd00::/8) from a MAC address and timestamp via SHA-1, with /48 prefix, first and last host, and reproducible seeding - entirely in your browser.
- [regex explainer](https://onlinetoolsforge.com/en/tools/regex-explainer/): Break any regular expression into token-by-token plain-English explanations with nesting structure and syntax validation - no regex engine knowledge needed.
- [dim weight calculator](https://onlinetoolsforge.com/en/tools/dim-weight-calculator/): Compute shipping volumetric weight from length, width, and height with IATA and courier divisors, compare carriers side by side, and see which weight you will be billed for - entirely in your browser.
- [headline analyzer](https://onlinetoolsforge.com/en/tools/headline-analyzer/): Score any headline for SEO title length, power words, and sentiment with bundled offline word banks - get an instant 0-100 verdict, entirely in your browser.
- [mouse tester](https://onlinetoolsforge.com/en/tools/mouse-tester/): Test mouse buttons, double-click speed, scroll wheel direction and step count, and live pointer coordinates in your browser - with a click-area heatmap. No install needed.
- [refresh rate tester](https://onlinetoolsforge.com/en/tools/refresh-rate-tester/): Estimate your display refresh rate (60/120/144/240 Hz and more) in the browser via requestAnimationFrame frame timing over two seconds - no software install needed.
- [discord timestamp generator](https://onlinetoolsforge.com/en/tools/discord-timestamp-generator/) — free online tool, runs in your browser
- [timecode calculator](https://onlinetoolsforge.com/en/tools/timecode-calculator/): Add and subtract SMPTE timecodes (HH:MM:SS:FF) at 24, 25, 30, or 60 fps and convert total frames to timecode - frame-accurate math for video editing, in your browser.
- [coordinate distance calculator](https://onlinetoolsforge.com/en/tools/coordinate-distance-calculator/): Compute the great-circle distance (Haversine) between two lat/lng points in kilometers, miles, and nautical miles, plus the initial bearing with a compass direction.
- [pbkdf2 hash generator](https://onlinetoolsforge.com/en/tools/pbkdf2-hash-generator/): Derive PBKDF2 password hashes with custom salt, iteration counts, and SHA-256/384/512 via the Web Crypto API, plus a verify mode - entirely in your browser.
- [word search generator](https://onlinetoolsforge.com/en/tools/word-search-generator/): Build printable word search puzzles from custom word lists with selectable grid sizes, horizontal/vertical/diagonal placement, and an answer-key grid - all in your browser.
- [cat age calculator](https://onlinetoolsforge.com/en/tools/cat-age-calculator/) — free online tool, runs in your browser
- [decimal time converter](https://onlinetoolsforge.com/en/tools/decimal-time-converter/): Convert HH:MM:SS clock times into decimal hours and minutes for timesheets, payroll, and billing - and convert decimal hours back into time, instantly in your browser.
- [wordle solver](https://onlinetoolsforge.com/en/tools/wordle-solver/): Filter a bundled five-letter word list by green, yellow, and gray clues to shortlist answers, with best-guess suggestions ranked by letter frequency - fully offline.
- [car lease calculator](https://onlinetoolsforge.com/en/tools/car-lease-calculator/): Estimate monthly lease payments from MSRP, capitalized cost, residual value, money factor, term, and taxes - with total rent charge and total lease cost summary.
- [auto loan calculator](https://onlinetoolsforge.com/en/tools/auto-loan-calculator/): Compute monthly car-loan payments and total interest from vehicle price, down payment, trade-in value, APR, and term - with loan amount and total paid summary.
- [position size calculator](https://onlinetoolsforge.com/en/tools/position-size-calculator/): Calculate a safe share quantity from account size, risk percent, entry price, and stop-loss - with dollar risk, risk per share, and total position value.
- [life expectancy calculator](https://onlinetoolsforge.com/en/tools/life-expectancy-calculator/): Estimate remaining life expectancy from age, sex, smoking, weight range, and exercise using a bundled actuarial table - instantly, privately, and fully offline.
- [csv pivot table](https://onlinetoolsforge.com/en/tools/csv-pivot-table/): Summarize CSV data with group-by rows and aggregate columns - sum, average, count, min, or max - like a spreadsheet pivot table, entirely in your browser.
- [linear regression calculator](https://onlinetoolsforge.com/en/tools/linear-regression-calculator/): Fit a least-squares regression line to pasted X/Y data - get slope, intercept, R², and the correlation coefficient with a scatter plot, entirely in your browser.
- [frontmatter editor](https://onlinetoolsforge.com/en/tools/frontmatter-editor/): Parse, validate, and edit YAML frontmatter blocks from Markdown files - type-aware field editing, error line numbers, and regenerated output for Hugo, Jekyll, and Obsidian.
- [secret pattern scanner](https://onlinetoolsforge.com/en/tools/secret-pattern-scanner/): Scan pasted code and configs for exposed API keys and tokens - AWS, GitHub, Slack, Google, Stripe, JWTs, private keys - using bundled offline regex patterns with masked output.
- [pdf page numbering](https://onlinetoolsforge.com/en/tools/pdf-page-numbering/): Add page numbers to PDFs with position, format ("Page X of Y"), font size, and start-offset options via pdf-lib - processed entirely in your browser, no upload.
- [jsonc to json converter](https://onlinetoolsforge.com/en/tools/jsonc-to-json-converter/): Strip comments and trailing commas from JSONC files like tsconfig.json and VS Code settings.json to get strict, valid JSON - with exact error line and column when the syntax is off.
- [biome config generator](https://onlinetoolsforge.com/en/tools/biome-config-generator/): Build a Biome v2 biome.json with formatter, linter rules, assist actions, and VCS integration via a visual form - copy-paste output generated in your browser.
- [slack block kit builder](https://onlinetoolsforge.com/en/tools/slack-block-kit-builder/): Compose Slack Block Kit JSON payloads - sections, headers, dividers, buttons, and inputs - with a live rendered preview, reordering, and copy-paste output, in your browser.
- [discord embed builder](https://onlinetoolsforge.com/en/tools/discord-embed-builder/): Design Discord webhook message embeds with title, description, fields, author, accent color, and footer - live preview and copy-paste JSON payload, in your browser.
- [i18n coverage checker](https://onlinetoolsforge.com/en/tools/i18n-coverage-checker/): Compare two locale JSON files (e.g. en.json vs th.json) to find missing keys, extra keys, and empty translations with per-namespace coverage stats - instantly in your browser.
- [video compressor](https://onlinetoolsforge.com/en/tools/video-compressor/): Re-encode and shrink videos in your browser via MediaRecorder with target bitrate, resolution scale, and WebM output - no upload, no queue, processed locally.
- [protobuf decoder](https://onlinetoolsforge.com/en/tools/protobuf-decoder/): Decode base64/hex protobuf payloads without a schema - show field numbers, wire types, varints, strings, and nested messages for gRPC and Kafka debugging, fully offline.
- [xml to xsd generator](https://onlinetoolsforge.com/en/tools/xml-to-xsd-generator/): Infer W3C XML Schema (XSD) definitions from XML instance documents - type detection, cardinality, and attributes - generated entirely in your browser.
- [thai withholding tax calculator](https://onlinetoolsforge.com/en/tools/thai-withholding-tax-calculator/): Compute Thai withholding tax (WHT) by income type with gross/net solve mode and PND form hints - service, rent, professional, contract, copyright, and advertising rates.
- [online ruler](https://onlinetoolsforge.com/en/tools/online-ruler/): Calibrate your screen with a reference card and measure objects in centimeters or inches on-screen with pixel-perfect tick marks - no download needed.
- [codeowners generator](https://onlinetoolsforge.com/en/tools/codeowners-generator/): Build GitHub CODEOWNERS files from team usernames, paths, and glob patterns with syntax validation and ownership coverage - generated entirely in your browser.
- [github badge builder](https://onlinetoolsforge.com/en/tools/github-badge-builder/): Compose shields.io badge URLs with label, message, color, style, and logo - live preview with copy-paste Markdown and HTML for READMEs. In your browser.
- [accent remover](https://onlinetoolsforge.com/en/tools/accent-remover/): Strip accents and diacritics from text via Unicode NFKD normalization for clean ASCII-only exports, usernames, and search indexes - instantly in your browser.
- [ssrf url checker](https://onlinetoolsforge.com/en/tools/ssrf-url-checker/): Inspect pasted URLs for private, loopback, link-local, and metadata-endpoint hosts that would be dangerous to fetch server-side - instant risk assessment in your browser.
- [psu wattage calculator](https://onlinetoolsforge.com/en/tools/psu-wattage-calculator/): Estimate total PC component wattage from CPU and GPU TDP, RAM, storage, and fans - recommend PSU capacity with headroom and estimate electricity cost per hour.
- [llm response cleaner](https://onlinetoolsforge.com/en/tools/llm-response-cleaner/): Strip markdown fences, thinking tags, and chatty preamble from LLM/agent output to get clean JSON or plain text - instant, fully client-side.
- [openapi diff](https://onlinetoolsforge.com/en/tools/openapi-diff/): Compare two OpenAPI/Swagger JSON specs and report added, removed, and modified endpoints with breaking-change flags - all computed in your browser.
- [lottie player](https://onlinetoolsforge.com/en/tools/lottie-player/): Preview and validate Lottie animation JSON - check version, dimensions, framerate, layer tree, and asset count. Works entirely offline in your browser.
- [encoding pipeline](https://onlinetoolsforge.com/en/tools/encoding-pipeline/): Build CyberChef-style operation chains (Base64, URL encode, hex, case, reverse) with reorderable steps - apply multiple encodings in sequence, entirely in your browser.
- [child height predictor](https://onlinetoolsforge.com/en/tools/child-height-predictor/) — free online tool, runs in your browser
- [gpx track analyzer](https://onlinetoolsforge.com/en/tools/gpx-track-analyzer/): Parse GPX activity files and compute total distance, elevation gain/loss, duration, pace, and per-km splits - with an SVG elevation profile. No upload required.
- [darts checkout calculator](https://onlinetoolsforge.com/en/tools/darts-checkout-calculator/): Suggest the fastest dart checkout routes from any remaining score 2-170 with T20 finishes, Bull options, and alternate routes - pure client-side math.
- [capital gains tax estimator](https://onlinetoolsforge.com/en/tools/capital-gains-tax-estimator/): Estimate short/long-term capital gains tax from cost basis, proceeds, holding period, and income-based rate brackets (US federal default plus custom-rate mode), all offline.
- [pdf page organizer](https://onlinetoolsforge.com/en/tools/pdf-page-organizer/): Reorder, rotate, and delete PDF pages with live thumbnails, then download the reorganized PDF - built with pdf-lib and pdf.js, no upload.
- [heic to jpg converter](https://onlinetoolsforge.com/en/tools/heic-to-jpg-converter/): Convert iPhone HEIC/HEIF photos to JPG or PNG in your browser with quality control and batch support - files never leave your device.
- [video audio extractor](https://onlinetoolsforge.com/en/tools/video-audio-extractor/): Rip the audio track from MP4, WebM, or MOV videos into MP3 or WAV in your browser with a live preview - no upload, no server.
- [online whiteboard](https://onlinetoolsforge.com/en/tools/online-whiteboard/): Sketch ideas on a large canvas with pen, shapes, arrows, and text - then export your diagram as PNG or SVG. Fully local, nothing to install.
- [crossword generator](https://onlinetoolsforge.com/en/tools/crossword-generator/): Build a printable crossword puzzle from your own word list with automatic grid layout, numbered clues, and SVG export - all in your browser.
- [saml decoder](https://onlinetoolsforge.com/en/tools/saml-decoder/): Base64-decode and inflate SAML AuthnRequest/Response XML with pretty printing and destination, issuer, and status field inspection - entirely client-side.
- [markdown to docx converter](https://onlinetoolsforge.com/en/tools/markdown-to-docx-converter/): Convert Markdown into Word .docx files in your browser with headings, lists, tables, and code blocks - no upload, powered by marked and docx.
- [excel serial date converter](https://onlinetoolsforge.com/en/tools/excel-serial-date-converter/): Convert between Excel serial date numbers and real dates for the 1900 and 1904 date systems, with the 1900 leap-year bug handled correctly.
- [anova calculator](https://onlinetoolsforge.com/en/tools/anova-calculator/): Run one-way ANOVA on pasted group datasets with F statistic, p-value, eta-squared effect size, and Bonferroni-adjusted pairwise comparisons - all client-side.
- [shadcn theme generator](https://onlinetoolsforge.com/en/tools/shadcn-theme-generator/): Generate shadcn/ui CSS variable themes (HSL tokens, radius, light and dark) from a base color with copy-paste globals.css output and a live preview.
- [css anchor positioning generator](https://onlinetoolsforge.com/en/tools/css-anchor-positioning-generator/): Build CSS Anchor Positioning API rules (anchor-name, position-area, position-try fallbacks) to attach popovers and tooltips to triggers, with a live preview.
- [groq playground](https://onlinetoolsforge.com/en/tools/groq-playground/): Run Sanity GROQ queries against pasted JSON entirely in-browser — filters, projections, order(), slices and reference joins with formatted output and syntax errors.
- [csv sql query](https://onlinetoolsforge.com/en/tools/csv-sql-query/): Run ad-hoc SQL SELECT queries on pasted or uploaded CSV files in your browser — WHERE, GROUP BY, HAVING, ORDER BY, aggregates and JOINs across files, with CSV or JSON export.
- [markdown slides converter](https://onlinetoolsforge.com/en/tools/markdown-slides-converter/): Turn Markdown into a navigable slide deck in your browser — split on --- separators, pick a theme, then export per-slide PNG/PDF, a whole-deck PDF, or a single-file offline HTML deck.
- [ai tool schema builder](https://onlinetoolsforge.com/en/tools/ai-tool-schema-builder/): Build JSON tool and function-call schemas for OpenAI, Anthropic and MCP from one visual form, with parameter types, enums and required flags validated as you type.
- [docx to markdown converter](https://onlinetoolsforge.com/en/tools/docx-to-markdown-converter/): Convert Word .docx documents into clean GitHub-flavored Markdown in your browser — headings, nested lists, tables, hyperlinks and footnotes, with no upload.
- [markdown to confluence converter](https://onlinetoolsforge.com/en/tools/markdown-to-confluence-converter/): Convert Markdown into Confluence wiki markup in your browser — headings, bold/italic, tables, nested lists, links, quotes and code blocks, ready to paste into the Confluence insert-markup dialog.
- [markdown table formatter](https://onlinetoolsforge.com/en/tools/markdown-table-formatter/): Clean up messy Markdown tables in your browser — re-align columns with consistent padding, preserve :---: alignment markers, trim cell whitespace, and handle missing outer pipes.
- [json to markdown table converter](https://onlinetoolsforge.com/en/tools/json-to-markdown-table-converter/): Convert JSON arrays of objects into GitHub-flavored Markdown tables in your browser — automatic column union, alphabetical ordering, alignment options, and empty cells for missing keys.
- [bento grid generator](https://onlinetoolsforge.com/en/tools/bento-grid-generator/): Build Apple-style bento grid layouts in your browser — asymmetric CSS Grid spans per cell, live preview, gap and radius controls, and copy-paste HTML with a ready style block.
- [neubrutalism generator](https://onlinetoolsforge.com/en/tools/neubrutalism-generator/): Design neo-brutalist cards in your browser — thick borders, hard offset shadows, bold color pairings, a live preview, and copy-paste HTML with a ready CSS block.
- [refinance calculator](https://onlinetoolsforge.com/en/tools/refinance-calculator/): Compare your current vs new mortgage side by side — monthly payment savings, break-even month for closing costs, and lifetime interest difference, all computed client-side.
- [options profit calculator](https://onlinetoolsforge.com/en/tools/options-profit-calculator/): Compute stock option payoffs in your browser — long or short calls and puts with max profit, max loss, break-even price, payoff at the current price, and an SVG payoff diagram.
- [secret santa generator](https://onlinetoolsforge.com/en/tools/secret-santa-generator/): Draw Secret Santa pairings in your browser — seeded reproducible shuffles, exclusion rules for couples and families, per-person reveal toggles, and copyable results, fully offline.
- [tailwind v3 to v4 migrator](https://onlinetoolsforge.com/en/tools/tailwind-v3-to-v4-migrator/): Migrate tailwind.config.js theme objects to v4 CSS-first @theme blocks in your browser — flattened color and font variables, automatic OKLCH hints, and warnings for removed v3-only options.
- [review rating calculator](https://onlinetoolsforge.com/en/tools/review-rating-calculator/): Find out how many five-star reviews you need to reach a target average rating from your current review count and score — exact math, instant results, fully client-side.
- [system prompt builder](https://onlinetoolsforge.com/en/tools/system-prompt-builder/): Assemble production-grade LLM system prompts in your browser — role, tone, audience, numbered constraints, output format, and few-shot examples composed into copy-paste text with no API.
- [trace context parser](https://onlinetoolsforge.com/en/tools/trace-context-parser/): Parse and validate W3C Trace Context headers in your browser — traceparent version, trace ID, span ID and flags with per-field validation, sampled-bit decode, and tracestate member checks.
- [barbell plate calculator](https://onlinetoolsforge.com/en/tools/barbell-plate-calculator/): Compute which plates to load per side for any target weight — kg or lb denominations, your own plate inventory counts, bar weight, and the exact remainder when the target is not reachable.
- [css starting style generator](https://onlinetoolsforge.com/en/tools/css-starting-style-generator/): Generate CSS @starting-style enter animations in your browser — popover, dialog or display:none targets, opacity and transform starting values, durations and easings, with allow-discrete transitions and a live remount preview.
- [graphviz dot renderer](https://onlinetoolsforge.com/en/tools/graphviz-dot-renderer/): Render Graphviz DOT graph descriptions into SVG diagrams in your browser — editable source, zoom and pan, and SVG/PNG export via the viz.js WebAssembly build, with no server involved.
- [homoglyph detector](https://onlinetoolsforge.com/en/tools/homoglyph-detector/): Detect Unicode homoglyph and confusable substitutions used in phishing and typosquatting — Cyrillic а vs Latin a, invisible characters, and bidi overrides with per-character highlighting and a skeleton view.
- [payment fee calculator](https://onlinetoolsforge.com/en/tools/payment-fee-calculator/): Calculate Stripe, PayPal and Shopify payment processing fees in your browser — see the net payout for a price, or reverse-solve the gross price to charge for a desired net payout.
- [iso country code lookup](https://onlinetoolsforge.com/en/tools/iso-country-code-lookup/): Look up ISO 3166 countries offline by name (EN/TH), alpha-2, alpha-3 or numeric code — with flag emoji, calling code and currency from a bundled dataset. Works with no network.
- [pdf text redactor](https://onlinetoolsforge.com/en/tools/pdf-text-redactor/): Black out sensitive text in PDFs in your browser — search a term, review the per-page matches, stamp opaque boxes over them via pdf-lib, and download the redacted file with no upload.
- [terraform plan explorer](https://onlinetoolsforge.com/en/tools/terraform-plan-explorer/): Explore terraform plan -json output in your browser — create, update, delete and replace summaries, per-resource before/after diffs, and filterable resource views, all parsed client-side.
- [log viewer](https://onlinetoolsforge.com/en/tools/log-viewer/): Paste NDJSON, logfmt or plain-text logs and explore them in your browser — level and text filters, level-stat bars, error clustering with digit normalization, and a scrollable entry view.
- [monthly budget calculator](https://onlinetoolsforge.com/en/tools/monthly-budget-calculator/): Build a 50/30/20 monthly budget in your browser — category expense breakdowns across needs, wants and savings, overspend warnings per group, and a savings-rate summary from your income.
- [audio speed changer](https://onlinetoolsforge.com/en/tools/audio-speed-changer/): Speed up or slow down audio files 0.25x to 2x in your browser — optional pitch-preserving overlap-add time stretch via Web Audio offline rendering, with preview and WAV download, no upload.
- [cpu flamegraph visualizer](https://onlinetoolsforge.com/en/tools/cpu-flamegraph-visualizer/): Render folded or raw stack traces (perf script, py-spy) into an interactive SVG flame graph in your browser — zoom into hot frames, search by name, and see per-function sample totals with no install.
- [pdf table extractor](https://onlinetoolsforge.com/en/tools/pdf-table-extractor/): Detect and extract tables from PDFs into CSV or Excel in your browser — pdf.js text-coordinate clustering reconstructs rows and columns per page, with preview and one-click downloads, no upload.
- [epub reader](https://onlinetoolsforge.com/en/tools/epub-reader/): Open and read EPUB e-books in your browser — chapter browsing via the OPF spine, adjustable font size, family and theme in a sandboxed frame, plus plain-text and HTML extraction, fully offline.
- [maze generator](https://onlinetoolsforge.com/en/tools/maze-generator/): Generate printable mazes in your browser — recursive backtracker or randomized Prim\u2019s algorithms, size and difficulty options, seeded reproducibility, a solution key toggle, and SVG or PNG export.
- [kanban board](https://onlinetoolsforge.com/en/tools/kanban-board/): A personal Kanban board in your browser — drag-and-drop cards across custom columns, colored labels, WIP limits with over-limit warnings, and localStorage persistence with JSON import and export.
- [sms segment calculator](https://onlinetoolsforge.com/en/tools/sms-segment-calculator/): Count SMS segments and estimate cost with GSM-7 vs UCS-2 rules — auto encoding detection, 160/153 and 70/67 character segment math, extension-character double counts, and per-character warnings, client-side.
- [android dp px converter](https://onlinetoolsforge.com/en/tools/android-dp-px-converter/): Convert between Android dp, sp and px at any screen density from ldpi to xxxhdpi — px = dp × dpi/160 math, instant results for all units, and a live density table for every bucket.
- [dependabot config generator](https://onlinetoolsforge.com/en/tools/dependabot-config-generator/): Generate .github/dependabot.yml in your browser — npm, pip, docker and github-actions ecosystems with daily, weekly or monthly schedules, grouped minor and patch updates, ignore rules, and copy-paste YAML.
- [ssh key fingerprint checker](https://onlinetoolsforge.com/en/tools/ssh-key-fingerprint-checker/): Decode pasted SSH public keys (RSA, Ed25519, ECDSA) in your browser — compute SHA256 and MD5 fingerprints and compare them against a known-good fingerprint before trusting a server.
- [wireguard config generator](https://onlinetoolsforge.com/en/tools/wireguard-config-generator/): Generate WireGuard wg0.conf Interface and Peer blocks in your browser — addresses, DNS, MTU, listen port, per-peer public keys, endpoints, AllowedIPs and persistent keepalive, with copy-ready output.
- [nps calculator](https://onlinetoolsforge.com/en/tools/nps-calculator/): Calculate Net Promoter Score from Promoter, Passive and Detractor response counts — percentage breakdown, quality band, and margin of error at 95% confidence, all client-side math.
- [vite config generator](https://onlinetoolsforge.com/en/tools/vite-config-generator/): Build vite.config.ts visually in your browser — React, Vue and Svelte presets with plugins, dev-server port and proxy, @ aliases, sourcemaps and minify options, generated as copy-paste TypeScript.
- [pyproject toml generator](https://onlinetoolsforge.com/en/tools/pyproject-toml-generator/): Generate PEP 621 pyproject.toml in your browser — uv, Poetry, setuptools or Hatch backends, project metadata, runtime and dev dependencies, with live TOML output ready to commit.
- [audio normalizer](https://onlinetoolsforge.com/en/tools/audio-normalizer/): Normalize audio loudness to a target LUFS level in your browser — Spotify -14, podcast -16 or EBU R128 -23 presets via Web Audio offline rendering, with preview and WAV download, no upload.
- [text similarity checker](https://onlinetoolsforge.com/en/tools/text-similarity-checker/): Compare two texts in your browser — Levenshtein, Jaccard and cosine similarity percentages plus a word-level diff showing which words appear only in one text, all computed client-side.
- [video trimmer](https://onlinetoolsforge.com/en/tools/video-trimmer/): Cut and trim video clips in your browser — timeline scrubber with start and end marks, quality options up to 8 Mbps, and export via MediaRecorder to WebM. The file never leaves your machine.
- [image upscaler](https://onlinetoolsforge.com/en/tools/image-upscaler/): Enlarge images 2x-4x in your browser with Lanczos3 resampling and unsharp-mask sharpening — sharper results than plain browser scaling, with before/after sizes and PNG download. No AI service needed.
- [api key rotator](https://onlinetoolsforge.com/en/tools/api-key-rotator/): Generate a new random API key with crypto.getRandomValues, compare old vs new entropy and character-set breakdown, and follow a zero-downtime dual-key rotation checklist - entirely client-side.
- [css easing cheatsheet](https://onlinetoolsforge.com/en/tools/css-easing-cheatsheet/): Browse 40+ named CSS easing keywords and curated cubic-bezier presets (snap, overshoot, anticipate, glide) with a live animated preview and copy-paste transition declarations.
- [regex performance tester](https://onlinetoolsforge.com/en/tools/regex-performance-tester/): Benchmark two regex patterns side by side against your sample text in the browser — ops/sec, average match time, match counts and backtracking warnings for nested quantifiers before they hit production.
- [depth of field calculator](https://onlinetoolsforge.com/en/tools/depth-of-field-calculator/): Compute depth of field, hyperfocal distance and near/far focus limits from focal length, aperture, subject distance and sensor format — pure client-side photography math.
- [viewing distance calculator](https://onlinetoolsforge.com/en/tools/viewing-distance-calculator/): Find the optimal TV or monitor size for your viewing distance — or the distance for a given size — using THX and SMPTE viewing-angle guidelines plus 1080p/4K/8K pixel-visibility limits, all offline.
- [json key sorter](https://onlinetoolsforge.com/en/tools/json-key-sorter/): Recursively sort JSON object keys alphabetically, case-sensitively or by value type, with ascending/descending order and configurable indentation for stable snapshot-test output.
- [blake hash generator](https://onlinetoolsforge.com/en/tools/blake-hash-generator/): Generate BLAKE2b, BLAKE2s and BLAKE3 digests of text or files in your browser via hash-wasm, with optional keyed hashing and selectable digest lengths.
- [chatgpt export viewer](https://onlinetoolsforge.com/en/tools/chatgpt-export-viewer/): Parse ChatGPT or Claude conversations.json exports into a searchable, readable thread view with one-click Markdown export — entirely client-side, your chat history never leaves the browser.
- [square footage calculator](https://onlinetoolsforge.com/en/tools/square-footage-calculator/): Compute floor area of rectangles, circles and triangles with unit conversion between feet, meters, yards and inches, plus cost-per-area totals for real estate and DIY planning.
- [confidence interval calculator](https://onlinetoolsforge.com/en/tools/confidence-interval-calculator/): Compute 90/95/98/99% or custom confidence intervals for means (t-based) and proportions (z-based), with margin of error, critical values and Wald small-sample warnings.
- [csv to vcard converter](https://onlinetoolsforge.com/en/tools/csv-to-vcard-converter/): Turn CSV contact lists into vCard 3.0/4.0 .vcf files with automatic field mapping for names, emails, phones and companies — bulk download ready for phone import, entirely client-side.
- [bubble level](https://onlinetoolsforge.com/en/tools/bubble-level/): Turn any phone or laptop into a spirit level with the DeviceOrientation API — live tilt degrees on two axes, a moving bubble and one-tap calibration, entirely on-device.
- [openapi to mcp converter](https://onlinetoolsforge.com/en/tools/openapi-to-mcp-converter/): Convert OpenAPI/Swagger specs into Model Context Protocol server tool definitions — one zod-validated tool per operation with fetch handler stubs for Claude, Cursor and VS Code.
- [ats resume checker](https://onlinetoolsforge.com/en/tools/ats-resume-checker/): Score a pasted resume against a job description with keyword coverage, formatting flags and missing-section warnings — deterministic heuristics bundled offline, no LLM and no upload.
- [product schema generator](https://onlinetoolsforge.com/en/tools/product-schema-generator/): Generate Product JSON-LD structured data with price, availability, brand and aggregate ratings from a simple form — copy-paste script tag output for rich product results.
- [nginx location match tester](https://onlinetoolsforge.com/en/tools/nginx-location-match-tester/): Work out which nginx location block wins for a request URI. A static analyzer of the documented nginx match order — exact, ^~, regex in file order, longest prefix — with a step-by-step decision trace and honest warnings for what it does not model.
- [csp evaluation tool](https://onlinetoolsforge.com/en/tools/csp-evaluation-tool/): Evaluate a Content-Security-Policy you already have: which script source is really in force after the default-src fallback, where unsafe-inline or unsafe-eval still apply, which wildcards allow any host, which directives have no fallback at all, and a suggested policy explaining every change.
- [drywall calculator](https://onlinetoolsforge.com/en/tools/drywall-calculator/): Estimate drywall sheets, screws, joint compound, and joint tape from room dimensions, with ceiling and wall options, opening deductions, sheet size, and an adjustable waste allowance.
- [local business schema generator](https://onlinetoolsforge.com/en/tools/local-business-schema-generator/): Generate LocalBusiness JSON-LD structured data with NAP consistency warnings, address, geo coordinates, opening hours, and price range, ready to paste into any page.
- [jupyter notebook viewer](https://onlinetoolsforge.com/en/tools/jupyter-notebook-viewer/): Open .ipynb notebooks in the browser: render code and Markdown cells, stream output, tables, images, and errors into a readable report you can export as Markdown.
- [image to ascii converter](https://onlinetoolsforge.com/en/tools/image-to-ascii-converter/): Turn any uploaded image into ASCII or Unicode-block art in your browser via pixel luminance mapping, with output width, character set, and inversion options.
- [ansible playbook generator](https://onlinetoolsforge.com/en/tools/ansible-playbook-generator/): Build Ansible YAML playbooks from hosts, vars, become, and task modules with fully qualified collection names (FQCN) and copy-paste-ready output.
- [3d print cost calculator](https://onlinetoolsforge.com/en/tools/3d-print-cost-calculator/): Price an FDM/FFF 3D print from filament grams and cost per kg, electricity kWh, machine wear per hour, failure rate, labor, and target margin with a full cost-per-print breakdown.
- [sql join visualizer](https://onlinetoolsforge.com/en/tools/sql-join-visualizer/): Explain INNER, LEFT, RIGHT, FULL, CROSS, and self joins with Venn diagrams and sample tables that show exactly which rows survive each join, entirely client-side.
- [microphone tester](https://onlinetoolsforge.com/en/tools/microphone-tester/): Test any microphone via getUserMedia with a live input level meter, waveform, channel check, clipping detection, and a recorded playback round-trip, all in-browser.
- [pptx text extractor](https://onlinetoolsforge.com/en/tools/pptx-text-extractor/): Unzip .pptx files in the browser and extract all slide text in order - titles, body, and speaker notes - into Markdown, plain text, or CSV with no upload.
- [kubectl explain builder](https://onlinetoolsforge.com/en/tools/kubectl-explain-builder/): Compose kubectl get, describe, rollout, logs, and apply commands from visual pickers of resources, flags, namespaces, and selectors, with copy-paste output and per-flag explanations.
- [math notepad](https://onlinetoolsforge.com/en/tools/math-notepad/): Type notes with inline math that auto-compute line by line - variables, unitful arithmetic, sums, and functions via mathjs - with a running results column, pure client-side.
- [github profile readme generator](https://onlinetoolsforge.com/en/tools/github-profile-readme-generator/): Build a GitHub profile README.md from a simple form - bio, skill badges, stats and streak cards, trophies, socials, and a visitor counter - with a live Markdown preview.
- [image dithering tool](https://onlinetoolsforge.com/en/tools/image-dithering-tool/): Apply Floyd-Steinberg, Atkinson, and Bayer ordered dithering to images on canvas with 1-bit, Game Boy, and grayscale palettes plus scale control, all client-side.
- [shell command explainer](https://onlinetoolsforge.com/en/tools/shell-command-explainer/): Paste a shell command and get per-flag plain-English and Thai explanations from a bundled offline dataset covering git, docker, curl, tar, ssh, and npm.
- [browser fingerprint checker](https://onlinetoolsforge.com/en/tools/browser-fingerprint-checker/): Show what your browser reveals to trackers - canvas, WebGL, and audio fingerprints, installed fonts, screen, timezone, and an entropy score - computed entirely in your browser.
- [email deliverability spam checker](https://onlinetoolsforge.com/en/tools/email-deliverability-spam-checker/): Score pasted email subject and body for spam-trigger words, ALL-CAPS and exclamation abuse, link density, URL shorteners, image-to-text balance, and missing unsubscribe - per-rule verdicts, fully offline.
- [network speed test](https://onlinetoolsforge.com/en/tools/network-speed-test/): Measure download, upload, latency, and jitter in your browser by timing fetches of same-domain static assets - with a connection-quality verdict and no third-party API.
- [yacht hull speed calculator](https://onlinetoolsforge.com/en/tools/yacht-hull-speed-calculator/): Compute displacement hull speed, sail area-to-displacement and capsize screening ratios, and propeller slip from boat dimensions - pure client-side math for sailors.
- [thread pool size calculator](https://onlinetoolsforge.com/en/tools/thread-pool-size-calculator/): Size thread pools from CPU cores and task wait/compute ratios using N = cores x (1 + W/C), with IO-bound and CPU-bound presets and copy-paste executor configs.
- [exposure triangle calculator](https://onlinetoolsforge.com/en/tools/exposure-triangle-calculator/): Explore aperture, shutter, and ISO trade-offs with exposure value math, an equivalent-exposure table, and a live brightness preview on canvas - pure client-side.
- [helm lint checker](https://onlinetoolsforge.com/en/tools/helm-lint-checker/): Paste Helm chart templates and values.yaml and catch missing required values, template syntax errors, unbalanced braces, and YAML issues with per-line diagnostics.
- [interest only mortgage calculator](https://onlinetoolsforge.com/en/tools/interest-only-mortgage-calculator/): Compute the interest-only phase payment and the post-IO principal+interest step-up, with two-phase totals and an interest comparison against a standard amortizing loan.
- [loan comparison calculator](https://onlinetoolsforge.com/en/tools/loan-comparison-calculator/): Compare up to three loans side by side - rate, term, and fees - with monthly payment, total interest, total cost, and a verdict on which loan wins by how much.
- [form builder](https://onlinetoolsforge.com/en/tools/form-builder/): Build HTML forms visually - text, email, number, textarea, select, checkbox, and radio fields with native validation attributes, reordering, and copy-paste output.
- [paycheck calculator](https://onlinetoolsforge.com/en/tools/paycheck-calculator/): Convert an annual salary to per-paycheck gross and net across weekly, biweekly, semimonthly, and monthly frequencies, with tax withholding, 401k, health, and post-tax deduction breakdowns.
- [calorie deficit calculator](https://onlinetoolsforge.com/en/tools/calorie-deficit-calculator/): Compute a daily calorie target from your TDEE and goal weight-loss rate, project when you reach your goal weight, and warn on unsafe deficit levels.
- [model training cost calculator](https://onlinetoolsforge.com/en/tools/model-training-cost-calculator/): Estimate GPU-hours and dollar cost to train a model from parameter count, tokens, GPU type, and utilization - with a cloud-provider price comparison table.
- [cyclomatic complexity calculator](https://onlinetoolsforge.com/en/tools/cyclomatic-complexity-calculator/): Analyze pasted JavaScript/TypeScript functions for cyclomatic complexity with per-function scores, risk grades, and refactoring hints - heuristic and fully in-browser.
- [dhcp option reference](https://onlinetoolsforge.com/en/tools/dhcp-option-reference/): Browse RFC 2132 DHCP options with types and descriptions, and build custom option 43/60/66/51 hex payloads for VoIP phones and routers with copy-paste output.
- [mortgage statement analyzer](https://onlinetoolsforge.com/en/tools/mortgage-statement-analyzer/): Analyze a mortgage from balance, rate, and payment: per-payment principal/interest split, payoff timeline, total interest, and extra-payment savings scenarios.
- [email bounce rate calculator](https://onlinetoolsforge.com/en/tools/email-bounce-rate-calculator/): Compute email campaign bounce rate from sent and bounced counts with a hard/soft split, industry benchmark verdicts, and deliverability-health warnings - fully offline.
- [url brand impersonation checker](https://onlinetoolsforge.com/en/tools/url-brand-impersonation-checker/): Flag lookalike domains imitating known brands via Levenshtein distance, homoglyph normalization, punycode/IDN decoding, and risky-TLD scoring - fully offline.
- [cdl practice test generator](https://onlinetoolsforge.com/en/tools/cdl-practice-test-generator/): Generate CDL practice quizzes from a bundled question bank covering general knowledge, air brakes, combination vehicles, and hazmat - instant scoring with missed-question review and printable output.
- [transparent image maker](https://onlinetoolsforge.com/en/tools/transparent-image-maker/): Remove solid or near-uniform backgrounds from PNG/JPG on canvas via corner-pixel color-keying with a tolerance slider and flood-fill edge cleanup, exporting alpha PNG - no upload.
- [rsa key inspector](https://onlinetoolsforge.com/en/tools/rsa-key-inspector/): Decode RSA/EC public keys and X.509 certificates from PEM with a built-in DER parser: algorithm, key size, exponent, curve, validity dates, and a strength verdict.
- [pdf form flattener](https://onlinetoolsforge.com/en/tools/pdf-form-flattener/): Flatten fillable PDF form fields into static page content via pdf-lib so values become uneditable - private, in-browser, and no upload.
- [kubernetes yaml validator](https://onlinetoolsforge.com/en/tools/kubernetes-yaml-validator/): Validate pasted Kubernetes manifests against built-in apiVersion/kind rules: missing required fields, wrong metadata blocks, and indentation errors with per-line diagnostics.
- [email authentication chain checker](https://onlinetoolsforge.com/en/tools/email-authentication-chain-checker/): Validate SPF, DKIM, and DMARC records together: syntax errors, missing policies, weak p=none, +all and ptr mechanisms, lookup limits, and alignment gaps with fix hints.
- [fishtank glass thickness calculator](https://onlinetoolsforge.com/en/tools/fishtank-glass-thickness-calculator/): Recommend aquarium glass thickness and safety factor from tank dimensions using height-based engineering tables, with water volume and glass weight, pure client-side.
- [favicon finder](https://onlinetoolsforge.com/en/tools/favicon-finder/): Parse pasted HTML head or URL markup to list every icon declaration - favicon, apple-touch-icon, manifest icons, mask-icon - with sizes and a copy-paste link-tag block.
- [cron gap simulator](https://onlinetoolsforge.com/en/tools/cron-gap-simulator/): Simulate the next fire times of multiple cron expressions on one timeline to expose silent gaps, overlapping runs, and scheduling surprises - pure client-side.
- [vision screen test](https://onlinetoolsforge.com/en/tools/vision-screen-test/): Run a calibrated Snellen acuity and Amsler-grid self-check on your screen with per-pixel size calibration, contrast-sensitivity rows, and results guidance.
- [wall mount height calculator](https://onlinetoolsforge.com/en/tools/wall-mount-height-calculator/): Compute ideal wall-mount center height and tilt from eye level, viewing distance, and TV size using THX/SMPTE viewing-angle guidelines.
- [carton capacity calculator](https://onlinetoolsforge.com/en/tools/carton-capacity-calculator/): Compute how many items fit per carton and how many cartons fit per pallet/container from item and box dimensions with orientation rotation and fill-ratio stats.
- [image ocr tool](https://onlinetoolsforge.com/en/tools/image-ocr-tool/): Extract printed text from images in-browser via Tesseract.js WASM with multi-language support and copy/TXT export - no upload.
- [duplicate file finder](https://onlinetoolsforge.com/en/tools/duplicate-file-finder/): Find duplicate files by SHA-256 hash with per-group keep/delete suggestions - processed entirely in your browser.
- [font file converter](https://onlinetoolsforge.com/en/tools/font-file-converter/): Inspect font files (TTF, OTF, WOFF, WOFF2) in your browser via opentype.js: detect format, read family, subfamily, units per em, and glyph count.
- [eml header viewer](https://onlinetoolsforge.com/en/tools/eml-header-viewer/): Open .eml email files in-browser to inspect headers, SPF/DKIM/DMARC verdicts, Reply-To mismatches, and the Received chain - no upload.
- [llm context packer](https://onlinetoolsforge.com/en/tools/llm-context-packer/): Pack files and text into an LLM context window (128k/200k/1M tokens) with per-file include/exclude toggles, estimated token counts, and XML-tagged bundle output.
- [file encoding detector](https://onlinetoolsforge.com/en/tools/file-encoding-detector/): Detect text-file encoding (UTF-8, UTF-16, Shift-JIS, TIS-620) via BOM and heuristics, with clean UTF-8 conversion - no upload.
- [audio joiner](https://onlinetoolsforge.com/en/tools/audio-joiner/): Merge multiple audio files into one track in-browser via Web Audio with crossfade and gap options - no upload.
- [annuity calculator](https://onlinetoolsforge.com/en/tools/annuity-calculator/): Compute sustainable monthly withdrawals or payouts from a lump sum with fixed or inflation-adjusted payments, depletion date, and total interest earned.
- [lockfile converter](https://onlinetoolsforge.com/en/tools/lockfile-converter/): Convert between package-lock.json and yarn.lock formats by parsing the dependency graph locally in your browser.
- [claude md generator](https://onlinetoolsforge.com/en/tools/claude-md-generator/): Build a CLAUDE.md project-context file for AI coding agents from repo commands, architecture notes, and conventions with section templates.
- [file encryptor](https://onlinetoolsforge.com/en/tools/file-encryptor/): Encrypt and decrypt any file in-browser via Web Crypto AES-256-GCM with PBKDF2 passphrase-derived keys, strength meter, and decrypt round-trip verify - zero upload.
- [canal boat cost calculator](https://onlinetoolsforge.com/en/tools/canal-boat-cost-calculator/): Estimate annual narrowboat living costs - mooring, licence, insurance, diesel, pump-out, blacking, safety cert, and maintenance reserve - with usage presets and monthly breakdown.
- [paver calculator](https://onlinetoolsforge.com/en/tools/paver-calculator/): Compute paver count with pattern waste allowance, sand and gravel base volumes, edge restraint length, and full cost totals from patio dimensions and paver size.
- [webhook signature verifier](https://onlinetoolsforge.com/en/tools/webhook-signature-verifier/): Verify and generate HMAC webhook signatures for Stripe, GitHub, and Slack schemes via Web Crypto, with timestamp tolerance checks and ready-to-run snippets.
- [ai crawler checker](https://onlinetoolsforge.com/en/tools/ai-crawler-checker/): Audit robots.txt and page meta tags for AI crawler access rules - GPTBot, ClaudeBot, CCBot, PerplexityBot and more - with per-bot verdicts and copy-paste blocking snippets.
- [gantt chart generator](https://onlinetoolsforge.com/en/tools/gantt-chart-generator/): Build project Gantt charts from task rows (name, start, end, progress percent) with an auto-scaled time axis and SVG/PNG export, entirely client-side.
- [video cropper](https://onlinetoolsforge.com/en/tools/video-cropper/): Crop a selected region out of MP4/WebM videos in-browser via canvas and MediaRecorder, with a draggable region picker and quality presets - no upload.
- [nutrition label generator](https://onlinetoolsforge.com/en/tools/nutrition-label-generator/): Build an FDA-style nutrition facts label from serving size, calories, macros, and micronutrients with automatic percent daily values and print or PNG export.
- [speaker test](https://onlinetoolsforge.com/en/tools/speaker-test/): Play channel-identifying tones and frequency sweeps via Web Audio to find silent, swapped, or unbalanced speakers and headphones - all in-browser.
- [board foot calculator](https://onlinetoolsforge.com/en/tools/board-foot-calculator/): Compute board feet (length x width x thickness / 144) and total lumber cost for multiple plank sizes, with wood species price presets and a waste allowance.
- [hourly to salary converter](https://onlinetoolsforge.com/en/tools/hourly-to-salary-converter/): Convert hourly rates to annual, monthly, biweekly, and weekly salary - or salary back to hourly - with hours-per-week, unpaid leave, and overtime estimates.
- [sorting algorithm visualizer](https://onlinetoolsforge.com/en/tools/sorting-algorithm-visualizer/): Animate bubble, insertion, selection, merge, and quick sort step-by-step on adjustable arrays with comparison and swap counters plus speed control.
- [icu message format translator](https://onlinetoolsforge.com/en/tools/icu-message-format-translator/): Write ICU MessageFormat plurals and selects, preview formatted output per locale (en, th, ar, ru) with real plural rules, and catch syntax errors instantly.
- [height comparison chart](https://onlinetoolsforge.com/en/tools/height-comparison-chart/): Draw up to 8 people or objects to scale on a shared height chart with silhouette bars, axis gridlines, and PNG export - pure client-side rendering.
- [vo2 max calculator](https://onlinetoolsforge.com/en/tools/vo2-max-calculator/): Estimate cardio fitness (VO2 max, ml/kg/min) from a Cooper 12-minute run, a race result, or resting heart rate, with sex-based fitness-class bands and percentile.
- [pool volume calculator](https://onlinetoolsforge.com/en/tools/pool-volume-calculator/): Compute water volume in rectangular, circular, oval, and kidney-shaped pools in gallons and liters, with pump turnover time and chlorine dosing estimates.
- [llm vram calculator](https://onlinetoolsforge.com/en/tools/llm-vram-calculator/): Estimate the GPU VRAM a local LLM needs: weights by quantization level, KV cache for your context length and batch size, and overhead, compared against common GPUs and unified memory.
- [golf handicap calculator](https://onlinetoolsforge.com/en/tools/golf-handicap-calculator/): Work out a World Handicap System index from your scorecards: score differentials from course rating and slope, the lowest-N selection table, the adjusted gross score net double bogey cap, and a course handicap converter.
- [teleprompter](https://onlinetoolsforge.com/en/tools/teleprompter/): Auto-scroll your script at an adjustable speed over an optional camera preview for video recording, with font size, mirror mode, line focus and keyboard speed controls, fully client-side.
- [bicycle gear calculator](https://onlinetoolsforge.com/en/tools/bicycle-gear-calculator/): Compute gear inches, development meters, gain ratios and speed at cadence from chainring and sprocket teeth, wheel size and crank length, with a gear-step comparison table across a full cassette, pure client-side math.
- [race time predictor](https://onlinetoolsforge.com/en/tools/race-time-predictor/): Predict 5K-to-marathon finish times from a recent race result with Riegel exponent models, equivalent paces per km and mile, negative-split and fade scenarios, and training-pace zones for easy, long run, tempo and interval days, pure client-side math.
- [sql schema diff](https://onlinetoolsforge.com/en/tools/sql-schema-diff/): Compare two CREATE TABLE DDL scripts or dumped schemas and report added and dropped tables and columns, type changes, nullable flips, default changes, index diffs and possible renames, with ALTER TABLE migration suggestions, all in-browser.
- [xirr calculator](https://onlinetoolsforge.com/en/tools/xirr-calculator/): Solve annualized returns for irregular cash flows and dates, SIP plans, private deals and dividend streams, with Newton and bisection XIRR solving, a classic IRR cross-check, totals, duration and a contribution-weighted chart, pure client-side math.
- [flashcard study tool](https://onlinetoolsforge.com/en/tools/flashcard-study-tool/): Study CSV or pasted question-answer flashcards with SM-2 spaced-repetition scheduling, card flip, keyboard shortcuts and per-deck progress persisted to localStorage, with JSON import and export, fully offline in your browser.
- [decking calculator](https://onlinetoolsforge.com/en/tools/decking-calculator/): Estimate deck boards, joists and screws from deck dimensions with board width, gap spacing, board length, joist spacing, waste allowance and cost totals for boards and joists, pure client-side math.
- [fence calculator](https://onlinetoolsforge.com/en/tools/fence-calculator/): Compute fence posts, rails and pickets from perimeter length and gate counts with post-spacing presets, picket width and gap, concrete bag estimates per post hole and full cost totals, pure client-side math.
- [countertop calculator](https://onlinetoolsforge.com/en/tools/countertop-calculator/): Estimate countertop slab count, edge-finishing length and installed cost from kitchen dimensions, with sink and cooktop cutout deductions, waste allowance and price presets for slabs, edges and installation, pure client-side math.
- [mulch calculator](https://onlinetoolsforge.com/en/tools/mulch-calculator/): Compute mulch bags or bulk cubic meters needed from garden-bed area and depth, with bag-size presets, bag versus bulk cost comparison and a coverage chart at common depths, pure client-side math.
- [prompt injection scanner](https://onlinetoolsforge.com/en/tools/prompt-injection-scanner/): Scan pasted prompts and documents for prompt injection patterns — instruction overrides, role hijacks, jailbreak modes, system-prompt exfiltration, fake chat delimiters and invisible Unicode — with offline heuristics and per-match highlighting, fully in-browser.
- [big number calculator](https://onlinetoolsforge.com/en/tools/big-number-calculator/): Do exact arithmetic on huge integers beyond Number.MAX_SAFE_INTEGER — factorials, powers, sums, products and floor division with remainder — using BigInt math with thousands separators and digit-count statistics, pure client-side.
- [fiscal quarter calculator](https://onlinetoolsforge.com/en/tools/fiscal-quarter-calculator/): Map any date to its fiscal quarter for a calendar or custom fiscal-year start month, showing quarter start and end dates, days remaining, the fiscal-year label and a full FY-to-Gregorian crosswalk table, pure client-side math.
- [ansi to html converter](https://onlinetoolsforge.com/en/tools/ansi-to-html-converter/): Render terminal logs with ANSI escape codes — colors, bold, italic, underline, strikethrough, 256-color and truecolor — into styled HTML with a dark or light live preview and a copy-paste output, fully client-side.
- [csv validator](https://onlinetoolsforge.com/en/tools/csv-validator/): Validate CSV files against RFC 4180: ragged row lengths, unescaped quotes, unterminated quoted fields, trailing garbage after quotes, blank lines, mixed line endings, BOM and smart quotes, with per-line diagnostics and auto-fix suggestions, fully client-side.
- [port number lookup](https://onlinetoolsforge.com/en/tools/port-number-lookup/): Look up well-known TCP and UDP ports by number or service name with protocol, description and common-risk flags from a bundled IANA-based dataset of 60+ ports, fully offline in your browser.
- [meat doneness temperature chart](https://onlinetoolsforge.com/en/tools/meat-doneness-temperature-chart/): Interactive USDA-safe cooking temperature chart for beef, pork, poultry, fish and lamb by doneness level with a Celsius/Fahrenheit toggle, rest-time guidance and a thermometer-reading doneness lookup, fully offline.
- [times table generator](https://onlinetoolsforge.com/en/tools/times-table-generator/): Generate printable 1-to-20 multiplication tables with highlight ranges, blank-cell practice sheets and an optional scored quiz mode, ideal for classrooms and home practice, fully client-side.
- [postman to curl converter](https://onlinetoolsforge.com/en/tools/postman-to-curl-converter/): Convert Postman Collection v2.1 JSON requests — method, headers, query, body, bearer, basic and apikey auth — into ready-to-run cURL commands or fetch snippets, with {{variable}} substitution and bulk copy, fully client-side.
- [standing desk height calculator](https://onlinetoolsforge.com/en/tools/standing-desk-height-calculator/): Compute ideal sitting and standing desk heights plus elbow and eye placement from your body height using classic ergonomic ratios, with monitor placement guidance, pure client-side math.
- [tap drill size chart](https://onlinetoolsforge.com/en/tools/tap-drill-size-chart/): Look up tap drill sizes for metric coarse and fine, UNC and UNF threads with the 75% thread formula, decimal inch equivalents and close-fit or free-fit clearance options, from a bundled offline chart.
- [coffee brew ratio calculator](https://onlinetoolsforge.com/en/tools/coffee-brew-ratio-calculator/): Dial in pour-over, espresso, French press, cold brew, moka pot and drip recipes from dose, water and ratio with method presets, bloom water split, strength guide and multi-cup scaling, pure client-side math.
- [css masonry generator](https://onlinetoolsforge.com/en/tools/css-masonry-generator/): Visually build a masonry layout with pure CSS grid-template-rows: masonry and a multi-column fallback, configurable columns, gap and item count, with a live preview and copy-paste HTML and CSS output.
- [nmap command generator](https://onlinetoolsforge.com/en/tools/nmap-command-generator/): Compose nmap scan commands from visual pickers of target, scan type, ports, timing template and verbosity, with plain-English explanations for every flag and copy-paste output, for authorized network reconnaissance.
- [motion sensor tester](https://onlinetoolsforge.com/en/tools/motion-sensor-tester/): Visualize DeviceMotion and DeviceOrientation data from phone sensors — acceleration, gravity, rotation rate, alpha/beta/gamma angles and compass heading — with iOS 13+ permission handling, fully client-side.
- [bac calculator](https://onlinetoolsforge.com/en/tools/bac-calculator/): Estimate blood alcohol content over time via the Widmark formula from standard drinks, body weight, sex and elapsed hours, with time-to-zero and legal-limit thresholds and a prominent estimates-only disclaimer, pure client-side math.
- [siding calculator](https://onlinetoolsforge.com/en/tools/siding-calculator/): Estimate vinyl or lap siding squares, trim linear meters and cost totals from wall perimeter, height, gable area and opening deductions, with waste allowance and quarter-square rounding, pure client-side math.

## Blog

Tool guides and how-tos: https://onlinetoolsforge.com/en/blog/