File Tools

Look up MIME types for file extensions

Convert file sizes between units, calculate download times, and plan storage requirements

Rename multiple files at once using patterns and rules

Create and extract ZIP, TAR, and other archive files

Split large files into smaller chunks or merge multiple files into one.

Merge multiple PDF files into one or split a PDF into individual pages. 100% client-side — your files never leave your browser.

Count the exact number of pages in a PDF and view document metadata — all in your browser, no uploads.

Rotate PDF pages 90, 180, or 270 degrees — per page or all at once. 100% client-side, no uploads.

Stamp text watermarks like DRAFT or CONFIDENTIAL onto PDF pages with custom opacity, size, rotation, color, and position. Runs entirely in your browser.

Reduce PDF file size in-browser by packing objects into compressed streams and stripping unused metadata. 100% client-side, no uploads.

View and edit PDF title, author, subject, keywords, and creation dates in-browser. 100% client-side, no uploads.

Check a file's real type from its magic-byte signature before opening it. Detect mismatched or fake extensions, view header bytes in hex, and confirm what the file actually is, entirely in your browser.

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.

Re-encode and shrink videos in your browser via MediaRecorder with target bitrate, resolution scale, and WebM output - no upload, no queue, processed locally.

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.

Reorder, rotate, and delete PDF pages with live thumbnails, then download the reorganized PDF - built with pdf-lib and pdf.js, no upload.

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.

Black out sensitive text in PDFs in your browser - search a term, review per-page matches, stamp opaque boxes over them and download the redacted file. No upload required.

Speed up or slow down audio files 0.25x to 2x in your browser - optional pitch-preserving time stretch via Web Audio offline rendering, with preview and WAV download. No upload.

Detect and extract tables from PDFs into CSV or Excel in your browser - pdf.js text-coordinate clustering rebuilds rows and columns per page, with preview and one-click downloads. No upload.

Open and read EPUB e-books in your browser - chapter browsing, adjustable font size, family and theme in a sandboxed frame, plus plain-text and HTML extraction. Fully offline.

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.

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.

Open .ipynb notebooks in your browser and render cells, outputs, and images into a readable Markdown report.

Unzip .pptx files in your browser and extract slide titles, body text, and speaker notes into Markdown, plain text, or CSV.

Flatten fillable PDF form fields into static page content so values become uneditable - private, in-browser via pdf-lib.

Find duplicate files by SHA-256 hash with per-group keep/delete suggestions - processed entirely in your browser.

Open .eml files to inspect headers, authentication verdicts, Reply-To mismatches, and the Received chain.

Merge multiple audio files into one track in-browser via Web Audio - no upload.

Crop a selected region out of MP4/WebM videos right in your browser with a draggable region picker and quality presets - no upload

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.

Convert a video to a different frame rate entirely in your browser: the clip plays into a canvas sampled at the target fps and is re-recorded as WebM via MediaRecorder — no upload, no server, works with any browser-playable input.