Free Online User Agent Parser Tool

1. Your current user-agent string loads automatically.
2. Read the parsed browser, engine, OS and device type.
3. Paste a different UA string to decode it instead.
4. Use the breakdown for debugging or analytics, not security.

Every browser sends a User-Agent header — and exposes it as navigator.userAgent — to identify itself. The format, loosely described in RFC 9110, has grown into a tangle of historical tokens (Mozilla/5.0, AppleWebKit, like Gecko) carried for compatibility, which is why raw UA strings are notoriously hard to read.

This parser picks the meaningful signals out of that noise: the browser name and version, the rendering engine (Blink, WebKit, Gecko), the operating system, and whether the string suggests a phone, tablet or desktop. It loads your current UA automatically, and you can paste any other string to decode it.

Use it for log analysis, reproducing a user's environment in a support ticket, or quick device detection. But treat the result as a hint, not proof — UA strings are trivially spoofed and browsers are actively freezing and reducing them, so for real capability checks the standard recommendation is feature detection rather than UA sniffing. Parsing runs entirely in your browser.