What Is My User Agent?

Your browser identifies itself to every website with a user agent string. Here is yours, decoded into browser, version, operating system and engine, with the raw string ready to copy.

Your user agent stringReading…
Browser
—
Version
—
Operating system
—
OS version
—
Rendering engine
—
Device type
—
Architecture
—
Mobile flag
—

Reading a user agent string

A modern Chrome string looks like Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36. Almost every token is historical baggage: Mozilla because early servers favoured Netscape, AppleWebKit and Safari because Chrome was built on WebKit, KHTML like Gecko because WebKit was built on KHTML and wanted Gecko-targeted pages. The parts that carry information are the platform in brackets and the Chrome version, and even those are now deliberately blurred to reduce fingerprinting.

The user agent is one of many signals a site can read from your browser. For the rest, including language, time zone, screen and hardware, see the browser info tool. To check whether your real address leaks through WebRTC while on a VPN, use the WebRTC leak test.

Frequently asked questions

What is a user agent?
A string your browser sends with every request identifying itself: browser, version, operating system and rendering engine. Sites use it to serve compatible pages and to build analytics.
Why does my user agent say Mozilla when I use Chrome?
History. Early servers sent better pages to Netscape (Mozilla), so every other browser started claiming to be Mozilla-compatible, and the token never left. Chrome’s string also contains Safari and KHTML for the same reason.
Why is the version number frozen or rounded?
Chrome and Firefox now reduce the detail in the user agent to limit tracking. Chrome reports a fixed minor version and a generic platform version; the precise values are available only through Client Hints, which this page reads when the browser offers them.
Can I change my user agent?
Yes, through developer tools or an extension. Sites cannot verify it, which is why user agent alone is not a reliable security signal.
Is this page recording my user agent?
No. It is read and displayed in your browser and never sent to us.
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