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What Is My User Agent?
What every website can learn about your browser and device without asking.
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About Browser Info
Your browser exposes more than most people expect. This page lists the details that JavaScript can read without any permission prompt, including your user agent, platform, screen and viewport size, pixel density, language preferences, timezone and hardware hints. Nothing on this page is sent anywhere. It is all read locally in your browser.
Frequently asked questions
What is a user agent?
A user agent is a line of text your browser sends to every website to say which browser, version and operating system you use. Sites use it to serve the right version of a page. You can see yours at the top of this page and copy it with one click.
Can I change my user agent?
Yes. Browser developer tools and some extensions can override it for testing. Changing it does not hide your IP address, and sites can often still tell your real browser from other signals.
What can websites learn from my browser?
Without asking, a site can read your browser and operating system, screen size, language, timezone and often your processor thread count and memory. Combined, these details can make your browser surprisingly unique, which is called fingerprinting.
How do I reduce what my browser reveals?
Use a browser with fingerprinting protection such as Firefox with strict tracking protection, Brave or Safari. Keep it updated, avoid unusual extensions that make your setup more unique, and consider a VPN if you also want to hide your IP address.