What Is a User Agent?
A user agent is a text string your browser sends with every request. It tells websites your browser name, version, operating system, and device type. Websites use it to serve the right layout and features for your setup.
It's also one of the key signals used in browser fingerprinting. Combined with other data points from your IP address and device, it helps build a profile that can track you across websites — even without cookies.
What This User Agent Checker Shows
- Your full user agent string
- Browser name and rendering engine
- Operating system and version
- Device type (desktop, mobile, tablet)
Why Checking Your User Agent Matters
Checking your user agent helps you understand what websites see when you connect. It's useful for debugging compatibility issues, verifying that a user agent spoofer is working, or simply learning how your browser identifies itself.
If you're concerned about fingerprinting, the best approach is to use a common, widely-shared user agent rather than randomizing it — randomization can actually make you stand out more.
Privacy Note
Your user agent string is sent to every website you visit automatically. It can reveal your browser, OS, and device type. This tool shows you exactly what's shared. We don't store, track, or log any of your data.