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User Agent Parser

Developer Tools

Parse user agent strings to identify browser, OS, device, and version.

⚡ Instant🔒 Private, in your browser🆓 Free, no sign-up👥 For developers
Your data never leaves your browser. We do not store inputs.

What User Agent Parser does

User Agent Parser reads a browser's user agent string and breaks it into browser name and version, operating system, and device type, so you don't have to decode the string by hand. Paste any user agent — or use your own, shown automatically — to see exactly what it identifies.

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Reviewed by the FreeToolsVerse team · Last updated · How we check our tools

How to use User Agent Parser

  1. Your own browser's user agent string is shown automatically, or paste a different one
  2. Click Parse to break it down
  3. Review the browser, OS, and device type identified
  4. Paste another user agent string to compare

Who should use it

Made for developers. Typical uses:

  • Decoding a user agent string from server logs to see which browser is causing errors
  • Checking whether a request is coming from a mobile device or a desktop browser
  • Verifying your own browser's reported version after an update

Frequently asked questions

What does it detect from the string?
Browser name and version, operating system and version, and whether the device is desktop, mobile, or tablet.
Why do user agent strings look so cluttered and inconsistent?
Most browsers include legacy identifiers (like 'Mozilla/5.0') for backward compatibility, which is why raw user agent strings look messy even though they follow a consistent format.
Is it free to use?
Yes, completely free.
Is the string I paste sent anywhere?
No, parsing runs entirely in your browser's JavaScript.
Can a user agent string be faked?
Yes, it's self-reported by the client and can be spoofed, so this tool tells you what a string claims, not whether it's genuine.

Learning resources

Explore more in Developer Tools, read the guides and articles, or see how we test our tools.

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