What Is My User Agent?
Instantly see your browser's user agent string, plus detected browser, operating system, language and platform details. Free user agent checker.
What a user agent is
Your browser sends a user agent string with every request, describing the browser and operating system so sites can adapt. Support teams ask for it when debugging ("what browser are you on?"), developers use it to reproduce issues, and analytics tools parse it for platform stats. Copy yours above with one click.
Historical baggage makes the string weird — every modern browser claims to be "Mozilla/5.0" and often "Safari" too, for compatibility with ancient sniffing code. Note it's also one ingredient in browser fingerprinting, alongside your IP address — see how tracking actually works.
Frequently asked questions
Why does my user agent mention Mozilla and Safari when I use Chrome?
Compatibility theatre: sites once served different content based on these tokens, so every new browser imitated its predecessors. The real identity is usually the last distinctive token (e.g. Chrome/126, Edg/126).
Can I change my user agent?
Yes — browser dev tools and extensions can override it, which is useful for testing how sites respond to other devices.