What does User Agent Parser actually do?

The user-agent parser tokenizes a UA string into browser, engine, OS, and device hints. UA strings are not a reliable identity. Chrome, Edge, and many in-app browsers deliberately look alike. It does not fingerprint the visitor of this site beyond the string you paste.

When should I use User Agent Parser?

Use it to decode a UA copied from a log line.

When should I not use User Agent Parser?

Do not use UA parsing as an auth or device-trust decision.

What does User Agent Parser not do?

A parsed “Chrome” can still be another Chromium shell. Does not detect client hints (Sec-CH-UA) unless you paste them as text.

User Agent Parser

Parse User-Agent strings to detect browser, OS, device type, and rendering engine. Free online — runs locally, no upload.

User Agent String

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User Agent Parser