User Agent Parser
Parse any user-agent string to reveal the browser, operating system and device, or inspect your own. Runs locally in your browser.
Optional Client Hints
UA alone cannot distinguish Windows 10 from Windows 11. Browser/OS versions, architecture and device model may be frozen, reduced, omitted or spoofed; high-entropy Client Hints can add evidence but are also client-provided.
Detection rules: 2026-07-20 snapshot.
HTTP errors? HTTP status codes · responsive CSS: CSS minifier.
Inspect any user agent
Parse desktop, mobile, tablet and common crawler signatures with a confidence level. Optional Client Hints are merged locally; nothing leaves your device.
FAQ
What is a user-agent string?
A line of text your browser sends with every request, describing the browser, rendering engine, operating system and device type.
Can I parse someone else’s UA?
Yes. Paste any user-agent string into the box to break it down. Your own is loaded by default.
Is detection always right?
No. User agents can be spoofed, and modern browsers freeze or reduce some fields. The parser reports confidence and keeps Windows 10/11 unresolved when the UA cannot distinguish them.
Can it identify crawlers?
It recognizes versioned signatures for common search, social-preview and AI crawlers, while noting that any user-agent token can be forged.
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