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Random User Agent Generator

Generate realistic random user agent strings for QA and browser/device-compatibility testing. Chrome, Firefox, Safari, Edge, Opera, and Samsung Internet across desktop, mobile, and tablet.

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For testing only. These user agent strings are realistic samples formatted like real browsers, but they are not tied to an actual browser session. Use them for QA, device-compat testing, and seed data — not for impersonating users or evading bot detection.
CONFIG — 62 REALISTIC SAMPLES
Everything runs locally in your browser — no user agents are sent to any server. See what your browser sends with the HTTP Header Checker, send requests with a custom User-Agent using the HTTP API Tester, or grab more test data from the Fake Data Generator.

Why Random User Agent Generator?

The first thing analytics, ad networks, and CDNs do with an incoming request is read its user agent - and the first thing that breaks in a test environment is usually a hardcoded one. This generator draws realistic desktop, mobile, and tablet strings across Chrome, Firefox, Safari, Edge, Opera, and Samsung Internet, so device-detection logic and content variations actually get exercised instead of silently passing because every test used your own browser string.

  • Filter by browser, device type, or OS when a test case targets a specific combo - Galaxy phones and iPhones parse very differently.
  • Use the seed for deterministic fixtures: the same seed always yields the same strings, so CI failures stay reproducible.
  • Strings are realistic samples, not real sessions - fine for QA and fixtures, never for impersonating users or dodging bot detection.
  • Pair it with the HTTP Header Checker to see what your own browser sends, and the HTTP API Tester to send requests with a chosen User-Agent header.

What is Random User Agent Generator?

Random User Agent Generator creates realistic user agent strings for QA and compatibility testing. It picks from a curated dataset of desktop, mobile, and tablet user agents across Chrome, Firefox, Safari, Edge, Opera, and Samsung Internet on Windows, macOS, Linux, Android, and iOS. Filter by browser, OS, or device type, generate one or many, and copy them for test suites, device-compat checks, and fixture data. Everything runs in the browser.

Common Use Cases

Browser Compatibility Testing

Verify your site or app renders and behaves correctly across the browser/OS combinations your analytics show real visitors use.

Device Detection Checks

Exercise server-side or client-side device-detection logic (responsive breakpoints, redirect rules, feature gating) with realistic desktop, mobile, and tablet strings.

QA Test Fixtures

Seed automated tests with a stable set of user agent strings — use the optional seed for repeatable, deterministic output in CI.

Scraper & Crawler Development

Test how your own scraping or content-processing scripts behave when pages serve different experiences to different user agents.

How to Use This Tool

  1. Filter by browser, device type, or OS — or leave everything on "All" for a fully random pick
  2. Set how many user agents you need (1–50)
  3. Optionally enter a seed to get the same output every time (useful for repeatable test fixtures)
  4. Click Generate, then copy individual strings, copy all, or download as JSON

Related Tools

Fake Data Generator → HTTP Header Checker → HTTP API Tester → Regex Tester → QA Metrics Calculator →

Learn More

Random User Agent Generator is a free online tool that requires no signup or installation. It works directly in your browser, keeping your data private and secure.