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Every time your browser requests a page, it tells the website which browser, operating system and device it runs on. These tools show exactly what your browser shares and how websites read it.
Browser and version
- User agent: the full text your browser sends with every request.
- Browser version: which browser you use and its major version, useful for checking whether you’re up to date.
- Full browser version: the complete version number, including the build and patch numbers the user agent hides.
Operating system and device
- Operating system: the OS reported in your user agent, such as Windows, macOS, Android or iOS.
- OS version: your exact Windows, macOS or Android version, read with Client Hints instead of the frozen user agent.
- CPU architecture: whether your processor is ARM or x86, 32-bit or 64-bit.
- Device type: whether you appear to be on a desktop, phone or tablet.
- Device model: the phone or tablet model your browser shares with websites.
To check whether JavaScript, cookies and local storage are switched on, see the browser settings checks. For your screen size, browser window size, pixel ratio and color depth, see the display tools.
Why the details can look out of date
To reduce fingerprinting, modern browsers deliberately report less in the user agent than they used to. Chrome, Edge, Safari and Firefox freeze parts of it: macOS is always reported as version 10.15, Windows 11 appears as Windows 10, and Chrome hides its minor version numbers. Websites that need precise details can request them through User-Agent Client Hints, which Chromium-based browsers support.
When these tools are useful
- telling a support team exactly which browser and OS you use
- checking which version of a browser you have before updating
- choosing the right download for your operating system and processor
- checking whether a site or app supports your browser