What What is My Browser does
What is My Browser reads browser-exposed values including brand information, operating-system or platform hints, mobile state, languages, cookieEnabled, screen dimensions, viewport dimensions, device pixel ratio, and the raw user-agent string. It performs the inspection in the page and displays the values without a server lookup.
Modern browsers deliberately reduce, freeze, or generalize identifying information, and privacy tools can modify it. The result is therefore a best-effort report of what this page sees, not authoritative device inventory. A browser brand or operating-system label can be incomplete, and cookieEnabled does not prove that every first- or third-party cookie is accepted.
How to use What is My Browser
- Open the tool in the browser session you want to inspect.
- Review the detected browser, operating system, device class, platform, and languages.
- Compare screen size, live viewport size, and device pixel ratio.
- Copy the reported user-agent string when it is useful for an authorized support case.
Important details
Client Hints are preferred when available
The tool uses exposed User-Agent Client Hints brands, mobile state, and platform first, then applies a simple user-agent parser when those hints are unavailable.
Screen and viewport measure different areas
Screen reports the display dimensions exposed by the browser, while viewport reports the current page layout area. Resizing the window updates the viewport value without changing the physical screen value.
Detection can be intentionally vague
User-agent reduction, anti-fingerprinting modes, extensions, remote desktops, emulation, and spoofing can generalize or change values. Unavailable or unknown is a valid privacy-preserving outcome.
Practical uses
- Collect browser and viewport context for a reproducible support report.
- Confirm the page's current language list and exposed device class.
- Compare screen, viewport, and pixel-ratio values during responsive debugging.
Privacy and limitations
All inspection runs in your browser, and this tool does not send the displayed browser details or user-agent string to PagesTools or a third-party service. Sharing or copying the report is your choice.
Values are self-reported and may be reduced, generalized, spoofed, or unavailable. The report cannot identify exact hardware, prove operating-system or browser versions, test all cookie policies, or replace real cross-browser and device testing.