Browser · OS · Screen · Connection

What Is My User Agent?

Your complete browser fingerprint — browser version, operating system, rendering engine, screen resolution, timezone, and more — exactly as web servers and APIs see you.

Browser & System Info
Detected automatically from your current browser session. No data is stored or transmitted.
Raw User-Agent String
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What is a user agent?

A user agent is a string that your browser sends with every HTTP request, identifying itself to web servers. It includes information about your browser name and version, operating system, and rendering engine. Web servers use this to serve appropriate content, while developers use it for analytics, compatibility testing, and debugging.

What does a user agent string look like?

A typical Chrome user agent on Windows looks like: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36. Despite looking like it says "Mozilla" and "Safari", this is Chrome — the format is a historical artifact of browser compatibility.

Why would I need my user agent?

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FAQ

User agent questions

Can I change or spoof my user agent?
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Yes. In Chrome DevTools, go to the Network conditions panel and you can set a custom user agent string. This is useful for testing how websites behave on mobile devices or different browsers without physically switching devices. Many browser extensions also offer user agent switching.
Why does my user agent say "Mozilla" even on Chrome?
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This is a historical quirk of the web. In the early browser wars, servers would only serve advanced content to "Mozilla" browsers. To ensure compatibility, all browsers began including "Mozilla" in their user agent — and the tradition continues to this day even though it's now meaningless for identification purposes.
Is my user agent data stored?
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No. All detection is done entirely in your browser using the navigator JavaScript API. No data is sent to our servers. Your user agent string never leaves your device.
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