What is User Agent?
A user agent is a line of text your browser sends to every website to identify itself — including the browser name and version, the operating system and the rendering engine. This page shows your full user agent string and breaks it down into your browser, OS, device type, language and other details, read live in your browser.
How User Agent works
Every HTTP request includes a User-Agent header. For example Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0 Safari/537.36 tells the server it is Chrome on 64-bit Windows. This tool parses that string with JavaScript.
Common uses
- Find your exact user agent string for bug reports
- Check which browser and version you are using
- Confirm your OS and device type
- Test responsive or browser-specific behaviour
Frequently asked questions
What is a user agent?
A text string your browser sends to websites identifying the browser, version and operating system.
What browser am I using?
This page detects and shows it from your user agent — see the Browser row.
Can I change my user agent?
Yes, via browser developer tools or extensions, which is useful for testing — but most users never need to.