User Agent Finder
See what your browser and device report to every website you visit.
Seeing the Identity String Your Browser Broadcasts
Every time your browser requests a webpage, it sends along a "user agent" string — a compact line of text identifying the browser, its version, and your operating system. Websites use this constantly for compatibility decisions you never see happening, and this tool shows you exactly what that string says about your current browser and device.
What's Actually Packed Into That String
A user agent string reads something like "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36" — a dense format shaped by decades of browser history and backward-compatibility conventions, where each token identifies a rendering engine, browser version, or operating system detail. This tool reads that string directly from your browser (via the navigator.userAgent property, a standard piece of information every browser exposes) and parses out the human-readable browser name, version, and operating system.
A Worked Example
Someone on a MacBook using Chrome sees their user agent identify macOS, the WebKit rendering engine, and a specific Chrome version number — information a website's server-side code reads to decide whether to serve a modern feature or a fallback for an older browser. Comparing that against the same person's iPhone Safari user agent reveals a completely different string identifying iOS and Safari's engine instead, which is exactly why a responsive website might serve subtly different behavior across the same person's two devices.
Why Websites Actually Check This
Serving different CSS or JavaScript to older browsers that don't support modern features, avoiding a broken layout on outdated software. Analytics platforms logging browser and device breakdown statistics to understand a site's visitor base. Some sites (increasingly rare, but still present) blocking or degrading functionality for specific browsers with known compatibility issues. Bot and scraper detection systems flagging suspicious or missing user agent strings as one signal among several.
Why the String Is Sometimes Deliberately Misleading
For historical compatibility reasons, virtually every modern browser's user agent string still contains the word "Mozilla" and often references other competing browsers' engine names too, a quirk dating back to 1990s browser wars where sites checked for specific strings to decide which page version to serve. Modern browsers kept including these legacy tokens purely for backward compatibility with old detection logic, which is why user agent strings often look confusingly cluttered rather than a clean, single browser name.
What This Reveals About Everyday Browsing
This same user agent string is sent to literally every website you visit as a routine, unavoidable part of how HTTP requests work — it's not unique to this tool or hidden information, just something most people never think to check directly. Seeing it explicitly here is often the first time people realize how much basic technical detail about their setup is visible to any site by default.
Read Directly From Your Browser
The string itself comes from a standard browser API and is displayed with client-side JavaScript — no external lookup or server call is needed, since your browser already knows and exposes this information about itself.
A Second Example
A developer testing how their website behaves across different browsers uses this tool to quickly confirm exactly which browser version and engine they're currently testing with, before comparing behavior against a different browser — a fast sanity check before diving into more involved cross-browser debugging.
Can a website fake or spoof its detected browser using the user agent?
Yes — browsers allow user agent strings to be manually overridden through developer tools or browser extensions, which is why user agent alone isn't considered a fully reliable detection method by sophisticated systems.
Why does my user agent mention browsers I'm not using, like Safari or Gecko?
This reflects decades of legacy compatibility conventions where browsers included references to competing engines to avoid being blocked by outdated detection logic on older websites.
Does checking my user agent here send any information to a server?
No — the string is read directly from your browser using a standard JavaScript API and displayed locally, without any network request involved.
Why does my mobile browser's user agent look so different from desktop?
Mobile browsers include operating system and device-type identifiers specific to that platform, which is part of how responsive sites detect whether to serve a mobile-optimized layout.
Is my user agent string considered private or sensitive information?
It's routinely shared with every website you visit as a normal part of web browsing, so while it does reveal some technical detail about your setup, it's not treated as sensitive personal data on its own.
User Agent vs. More Modern Detection Methods
Because user agent strings can be spoofed, many modern sites increasingly rely on additional signals — feature detection (checking whether a specific browser API actually exists rather than trusting a claimed browser name) or newer standards like Client Hints — alongside or instead of user agent parsing alone, for anything where accurate detection genuinely matters, like serving critical security features correctly.