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What Is My User Agent?

Your browser's full user agent string and parsed details.

User Agent String

Parse a different user agent string

Your user agent, decoded

The user agent string is a line of text your browser sends with every request to identify itself. This page reads it locally with navigator.userAgent and breaks it into the parts people actually want: browser and version, rendering engine, operating system, and whether the request looks like a phone, a tablet or a bot.

When you need it

Filing a bug report — support teams almost always ask for it.
Checking that a device or emulator is presenting the browser you expect.
Debugging user-agent sniffing, feature detection or a device-specific CSS issue.
Decoding a UA string out of a server log: paste it into the second box to have it parsed.

Modern user agent strings are deliberately misleading for historical reasons — nearly all of them still begin with Mozilla/5.0, and Chrome, Edge and Opera all mention Safari and WebKit. That is why the parsed breakdown is more useful than the raw line. Nothing here is logged or transmitted; the string never leaves your browser.