How to use it
- Read Browser and Operating system. The version is the one your browser reports; a full version may appear when the browser shares it.
- Check Do Not Track and Global Privacy Control. Both are requests that sites may honour; they are not a block.
- Use Copy to copy the User agent string, for example to report a display problem to a site.
What a browser tells websites
Every request a browser makes carries a user agent string: a line that names the browser, its engine and the operating system. Sites use it to choose how to show their pages. The string is also read by analytics tools, which is one reason it is not a reliable identity on its own.
This page reads the same information in your browser and works out the parts from the string. The parser is small and written for this page. It is not a database of every browser, so an unusual browser may show fewer details.
Why some details are not exact
Chromium-based browsers, such as Chrome and Edge, have reduced the string to a frozen form for privacy. The minor version numbers are 0.0.0, macOS is shown as 10_15_7 whatever the real version, and Windows 10 and Windows 11 are the same (NT 10.0). The browser can give the real answer in client hints, which this page uses when they are available. Windows 11 is reported with platformVersion 13.0.0 or higher.
Safari and other browsers on Apple systems also use the frozen form. Where the string is not enough, the page says so instead of guessing.
Privacy signals on this page
Do Not Track is a browser setting that asks sites not to track you. Global Privacy Control is a similar signal that some browsers send and that some laws make a site honour. Neither one blocks anything: a site decides whether to respect it. Many browsers do not send either signal, and the page shows that as not set.
- Cookies allowed shows whether the browser accepts cookies at all; it does not show which sites set them.
- Device memory is a rounded value the browser gives; not every browser provides it.
Example: a Windows PC with Edge
A user agent string that ends with Edg/120.0.0.0 comes from Microsoft Edge: the Chrome part of the string is the engine, and Edg names the browser. On Windows the string says NT 10.0, so the page shows Windows 10 or 11 until the browser's client hints tell which.
The rows below are what the parser makes of the Edge string of Microsoft's own documentation.
| Field | Value from the string |
|---|---|
| Browser | Edge 120.0.0.0 |
| Engine | Blink 120.0.0.0 |
| Operating system | Windows 10 (or 11, from the hint) |
| Device type | Desktop |
Frequently asked questions
Why does the page say Windows 10 or 11?
Both systems send the same string, Windows NT 10.0. The page can tell them apart only from the client hint platformVersion, which Windows 11 reports as 13.0.0 or higher. If your browser does not share that hint, the page cannot decide.
Why is my macOS version shown as 10.15.7?
Browsers freeze the macOS part of the user agent string at 10_15_7 for compatibility, so it does not show your real version. The true version is not available to websites in this string.
Does Do Not Track stop websites tracking me?
No. It is a request that sites may choose to honour. Many sites ignore it, and it does not stop cookies or other techniques by itself.
What is Global Privacy Control?
A browser signal that tells sites you do not want your personal data sold or shared. You switch it on in browsers that offer it; a site decides whether to respect it. The page shows Not reported when your browser has no such setting.
Is this information sent to your server?
No. The page reads these values in your browser and draws them on the screen. It does not send them to us or store them.
Why do the screen and the window sizes differ?
The screen size is the whole display; the window size is the part of it your browser uses, which is smaller when a window is not maximised. Both are measured in CSS pixels, which differ from physical pixels on high-density screens. The screen resolution tool shows both.
Sources
- MDN: User-Agent header, with examples of user agent strings
- Chromium: user-agent string reduction
- Microsoft Edge: user-agent guidance
- Microsoft Edge: detecting Windows 11 with client hints
- Samsung Internet: user agent string format
- MDN: Navigator.doNotTrack
- MDN: Navigator.globalPrivacyControl
Figures and text last checked on Tuesday, November 10, 2026.