What Is My User Agent?
Your Full User Agent String
Parsed Information
About User Agent Checker
Shows the user agent string your browser sends with every request, along with the browser, version and operating system it declares.
What the string contains
The user agent is a line of text identifying the browser and platform. It is also famously misleading: almost every browser still claims to be 'Mozilla/5.0' for historical compatibility, and Chrome, Edge and Opera all include 'Safari' and 'Chrome' in theirs. The string is a record of thirty years of websites blocking browsers by name, and browsers lying to get through.
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0 Safari/537.36, only Chrome/120.0 and Windows NT 10.0 carry real information. Everything else is compatibility theatre.Should I use it to detect browsers in code?
No. Detect features, not browsers — check whether the capability you need exists rather than guessing from a name. User agent detection breaks with every release, misidentifies new browsers, and is being deliberately reduced: Chrome now freezes parts of the string and offers structured Client Hints instead.
Why does my phone say it is a desktop?
Because you enabled 'Request desktop site', which makes the browser send a desktop user agent so servers return the full layout. Some browsers also do this automatically on tablets. It is the clearest demonstration of why the string cannot be trusted as fact.