Fake User Agent Generator
Generate a random modern browser user agent string instantly — Chrome, Safari, and Firefox formats for testing. Free, client-side UA generator.
🔒 100% Client-Side Processing
Your data is processed entirely in your browser and never transmitted to any server.
Common Use Cases
Testing UA-dependent code
Feed realistic Chrome, Safari, and Firefox strings to browser-detection and analytics-parsing logic.
Populating log fixtures
Fill synthetic access logs with plausible user agents for dashboard and parser development.
Frequently Asked Questions
- Which browsers do the generated user agents represent?
- Current-generation Chrome on Windows, Safari on macOS, and Firefox on Linux — the three dominant engine families, in genuine header format including the legacy Mozilla/5.0 prefix all browsers carry.
- Why do all user agents start with Mozilla/5.0?
- Historical compatibility: servers once sniffed for "Mozilla" to serve modern pages, so every later browser impersonated it and the token fossilised. It is now a permanent, meaningless prefix — a great trivia answer.
- I have a real user agent string and want to know what browser it is — is that this tool?
- Not this one — this page generates fake UA strings for testing. Use the User Agent Parser to decode a real user agent into its browser, OS, device type, and engine.
- Is my data private when I use this tool?
- Yes. This tool runs entirely in your browser using client-side JavaScript — nothing you type is transmitted to, logged by, or stored on any server. You can safely process confidential text, tokens, or code.