User Agent Generator
Free online User Agent Generator. Pick from common Chrome, Firefox, Safari, Edge, mobile, and Googlebot user-agent strings, or build a custom one by browser, OS, and device. Copy ready-to-paste UA strings for testing. 100% client-side.
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What is User Agent Generator?
User Agent Generator is an in-browser tool that helps developers, QA engineers, and testers produce user-agent (UA) strings for HTTP requests, scraping, analytics testing, and bot simulation. It ships with 11 ready-to-use common UA presets covering Chrome, Firefox, Safari, Edge, Android, iPhone, Linux, Googlebot, and curl, plus a custom builder that composes a realistic UA string from a chosen browser, operating system, and device type. A one-click "Use Current Browser" button fills your real navigator.userAgent, and a Random button picks a preset for quick fuzz testing. Everything runs client-side - no UA string ever leaves the browser.
Key Benefits
- No need to hunt down or memorize user-agent strings
- Mix browser, OS, and device to build realistic custom UAs
- One-click access to your real browser UA via navigator.userAgent
- Copy-ready strings for curl, Postman, Playwright, and test suites
Common Use Cases
- •Testing responsive or bot-specific server behavior
- •Populating User-Agent headers in API and scraper tests
- •Simulating mobile vs desktop traffic in QA
- •Generating Googlebot or curl UA strings for SEO and caching checks
How to Use the User Agent Generator
- Pick a preset: Browse the Common User Agents grid and click Select on any preset (Chrome, Firefox, Safari, Edge, mobile, Googlebot, curl) to load it into the top box.
- Or build a custom UA: Use the Custom User Agent Builder to choose a browser, an OS, and a device type. The generated string updates live; click Use to send it to the top box.
- Use your real browser: Click Use Current to autofill the box with your actual navigator.userAgent, or click Random to pick a preset for quick testing.
- Copy the string: Click Copy next to the top box (or on any preset / custom card) to copy the user-agent string to your clipboard for use in tests.
Key Features
- 11 ready-to-use common user-agent presets (Chrome, Firefox, Safari, Edge, mobile, Googlebot, curl)
- Custom builder mixes browser, OS, and device to generate a UA string
- One-click "Use Current Browser" fills your real navigator.userAgent
- Random button picks a preset for quick fuzz testing
- Copy any UA string with per-item copied feedback
- 100% client-side, no data sent to any server