Inspect and decode your browser's User-Agent string with our free User Agent Lookup tool. Extract browser name, operating system platform, rendering engine, and architecture tokens with 100% offline privacy.
The tool extracts navigator.userAgent automatically on page load.
Review extracted tokens categorizing Browser, OS, Rendering Engine, and Platform.
Click Copy User Agent to copy your complete raw UA string for debugging.
Extracts exact navigator.userAgent strings for HTTP request debugging and cross-browser testing.
Parses layout engines (Gecko, WebKit/Blink), operating systems, and vendor tokens without server calls.
User-Agent inspection runs entirely inside browser memory. No device signatures are sent to external analytics.
The User-Agent request header follows RFC 7231 syntax: Mozilla/5.0 (Platform; OS) Engine/Version Browser/Version. Tokens reveal operating system build types, rendering engine numbers, and browser vendor release cycles.
To combat passive browser fingerprinting, modern standards bodies are phasing out detailed User-Agent strings in favor of User-Agent Client Hints (UA-CH) (navigator.userAgentData), which require explicit opt-in headers to access fine-grained device data.
Understanding UA strings remains vital for web developers diagnosing cross-browser compatibility issues, polyfill loading strategies, and server-side device routing rules.