Network · Browser
What operating system do I have?
Windows, macOS, Linux, Android, iOS or ChromeOS, read from your browser, with the version and CPU type when your browser shares them.
Your operating system
Details
How to read your result
The first answer comes from the User-Agent string, which has no fixed structure (RFC 9110) and is being reduced by browsers for privacy. In it, Windows 10 and Windows 11 look identical, so the page shows "10 or 11" until it can check better.
Where your browser supports User-Agent Client Hints (Chrome, Edge and other Chromium browsers), the page asks for the platform version, architecture, bitness and device model. Microsoft documents that a platform version of 13.0.0 or above means Windows 11 and 1.0.0 to 10.0.0 means Windows 10, and this page applies that rule. Firefox and Safari do not offer these hints, so they keep the "10 or 11" answer.
Browsers reduce the detail in the User-Agent string for privacy, so the macOS version shown from the string may be older than the real one. To be exact, check About This Mac, Settings, System, About or your phone's About screen.
Sources (retrieved October 2026): RFC 9110, HTTP Semantics, sections 10.1.5 and 12.5.4; Chrome: What is User-Agent reduction?; User-Agent Client Hints (WICG); Microsoft Edge: detect Windows 11 with Client Hints.
Frequently asked questions
How do I tell whether I have Windows 10 or Windows 11?
On Chromium browsers this page reads the Client Hints platform version and reports Windows 11 when it is 13.0.0 or above. On other browsers, open Settings, then System, then About on the PC.
Why does my Mac show an old macOS version?
Browsers reduce the detail in the User-Agent string for privacy, so the number can be older than what you run. The About This Mac screen is exact.
What does the CPU architecture row mean?
It shows x86 or arm and the bitness (32 or 64) when the browser shares them through Client Hints. It describes the device, for example an Apple silicon or Intel Mac.
Can a website see my exact operating system?
It sees what your browser shares: the User-Agent string, and Client Hints when the site asks and the browser allows. Browsers are reducing the detail in the string over time.
Is anything sent to a server?
No. The page reads your browser locally and nothing is stored or transmitted by it.
Private by design
This tool reads values from your own browser and shows them on this page. The tool does not store them, send them to TNAADO or pass them to any other service. What your browser reports can be reduced or changed by privacy settings and extensions, so treat it as what the browser says, not as proof.