User-Agent Parser
Decode any User-Agent string to identify browser, OS, device type, and rendering engine.
Examples
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36
Mozilla/5.0 (Macintosh; Intel Mac OS X 14.4; rv:125.0) Gecko/20100101 Firefox/125.0
Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) … Safari/604.1
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
curl/8.4.0
How it works
Parsing is regex-based heuristic detection. UA strings are not standardized - browsers intentionally include tokens from other browsers for compatibility (e.g., Chrome includes "Safari"). Detection order matters: Edge must be checked before Chrome, Opera before Chrome, to avoid misclassification.
The navigator.userAgent value for the current browser is accessible via the "Use my UA" button.
Security note
User-Agent strings cannot be trusted for security decisions - any client can send any UA string. Use UA parsing only for analytics and UX optimization, never for access control or security enforcement.