What is a User-Agent string?

A line of text every browser sends with its web requests, identifying itself — including the browser name and version, operating system, and rendering engine. Servers use it to serve browser-appropriate content, and analytics tools use it to report visitor browser/OS breakdowns.

Why do User-Agent strings look so messy, with multiple browser names in them?

For historical compatibility — many browsers include tokens for older browsers they're compatible with (e.g. Chrome includes "Safari" since it's WebKit/Blink-based) so older sites that check for specific strings don't break. This tool checks tokens in the right order of specificity to identify the actual browser.

Can a User-Agent string be spoofed?

Yes — any client can send any User-Agent value it wants, including browser dev tools, extensions, or scripts. This tool reports what the string claims, which is useful for debugging but isn't a reliable security signal.

Is my User-Agent string sent anywhere?

No. Parsing runs locally in your browser with JavaScript — nothing is transmitted or stored.

USER-AGENT PARSER

Decode any User-Agent string into browser, OS, and device info. Nothing leaves your browser.

User-Agent string

BrowserChrome128.0.0.0

Operating systemmacOS10.15.7

Device / EngineDesktopBlink

How to use the User-Agent parser

1
Paste a User-Agent string, or click "Use my browser's" to parse your own.
2
Read the detected browser name and version.
3
Read the detected operating system and version.
4
Check the device type (desktop, mobile, tablet) and rendering engine.

Questions

What is a User-Agent string?: A line of text every browser sends with its web requests, identifying itself — including the browser name and version, operating system, and rendering engine. Servers use it to serve browser-appropriate content, and analytics tools use it to report visitor browser/OS breakdowns.
Why do User-Agent strings look so messy, with multiple browser names in them?: For historical compatibility — many browsers include tokens for older browsers they're compatible with (e.g. Chrome includes "Safari" since it's WebKit/Blink-based) so older sites that check for specific strings don't break. This tool checks tokens in the right order of specificity to identify the actual browser.
Can a User-Agent string be spoofed?: Yes — any client can send any User-Agent value it wants, including browser dev tools, extensions, or scripts. This tool reports what the string claims, which is useful for debugging but isn't a reliable security signal.
Is my User-Agent string sent anywhere?: No. Parsing runs locally in your browser with JavaScript — nothing is transmitted or stored.