How to use the Browser Info and User Agent Checker
- 1. Open the toolYour own user agent string is filled in automatically.
- 2. CheckOr paste another user agent from a log or bug report first.
- 3. Copy the reportShare the details with support or attach them to a bug report.
What the report shows
- Browser and version, operating system and device type, read from the user agent string.
- Screen size vs viewport: the screen is the whole display; the viewport is the part of the window your page can use. Media queries use the viewport.
- Device pixel ratio: 2 or 3 on most phones, meaning images need 2× or 3× pixels to look sharp.
- Language, time zone, cookies, touch support, CPU threads and, where shared, memory.
- Dark-mode and reduced-motion preferences, which your CSS can respond to.
Everything is read in your browser with standard web APIs. Nothing is sent or stored.
Worked example and caution
A user agent like Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Mobile Safari/537.36 is read as Chrome 129 on Android 14, Phone. The tool checks for Edge, Opera and Samsung Internet before Chrome, because those browsers also include "Chrome" in their strings.
Be careful about relying on user agents in code:
- Browsers now reduce and freeze parts of the string for privacy. Windows 11 still reports Windows NT 10.0, for example, so the tool shows "10 or 11".
- Users and bots can fake any user agent.
- For features, test for the feature itself (like
'share' in navigator) instead of guessing from the browser name.
The best use is support and debugging: when someone reports a bug, ask them to send this report.
Frequently asked questions
Why does it say Windows 10 or 11?
Windows 11 browsers still send the Windows 10 version number in the user agent, so the two can't be told apart from it.
Is any of this sent to Uncodemy?
The details are shown only to you. The lead form asks for your name and number separately; browser details are not attached.
Can I check a user agent from my server logs?
Yes. Paste it into the box; screen details are shown only for your own browser.
Is the browser info and user agent checker free?
Yes, it is free. Your first check asks for your name and WhatsApp number once, and after that the browser info and user agent checker and every other Uncodemy tool open without the form.