See your complete browser user agent string, parsed into browser, version, OS and engine. Copy your UA instantly.
A user agent string is a text identifier your browser sends with every HTTP request. It tells websites which browser, version, and operating system you're using, so they can serve compatible content.
Example: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0
User agent strings are used for browser detection, analytics, content negotiation, and A/B testing. They can also be spoofed — meaning you can change your UA to appear as a different browser.
User agents are sent with every HTTP request. Servers use them for browser detection, device-appropriate content serving, and analytics. Feature detection is now preferred over UA sniffing as UAs can be spoofed and are increasingly reduced for privacy.
Chrome and other browsers are reducing UA string detail to prevent fingerprinting as part of the Privacy Sandbox initiative. Future UAs will contain less specific OS and version information. The User-Agent Client Hints API is the modern replacement.