What Is My Browser
betaThis tool shows what your browser reports about itself: user agent string, detected browser and operating system, screen resolution, viewport size, device pixel ratio, CPU cores, timezone, language and network status. It reads only what your own browser already exposes to any web page — nothing is uploaded.
See what your browser reports about itself — user agent, browser & OS, screen and viewport size, timezone and more. Nothing is uploaded; this reads only what your own browser exposes to any web page.
How to use What Is My Browser
- 1 Open the page — your details are detected automatically.
- 2 Read your user agent, browser, screen and viewport size.
- 3 Resize the window to watch the viewport values update live.
- 4 Copy any single value, or copy everything as JSON.
Frequently asked questions
What is a user agent?
The user agent is a string your browser sends with every request that identifies the browser, its version and your operating system.
Is any of this sent to a server?
No. Everything shown is read locally from your browser; nothing is uploaded or stored.
Why is my screen size different from my viewport size?
Screen size is your whole display; the viewport is the visible area of the browser window, which is smaller due to toolbars, scrollbars and window chrome.
What is device pixel ratio?
It is how many physical screen pixels map to one CSS pixel — 2 or 3 on high-DPI "Retina" displays, 1 on standard screens.