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User-Agent Parser

A tool that parses User-Agent strings from HTTP request headers and extracts and displays browser, OS, and device information.

User-Agent String

How to use

About this tool

Parses User-Agent strings and shows browser, OS, device type, and similar info.

How to use

Paste a UA or use your own; view the result by field.

Use cases

• Debugging device detection • Bot detection • Compatibility checks • Access analysis

FAQ

Q: What information does a User-Agent string contain?
A: A User-Agent (UA) string typically encodes the browser name and version, rendering engine (e.g. WebKit, Gecko), operating system and version, device type (desktop, mobile, tablet), and sometimes architecture. The parser extracts each field so you can inspect them individually.
Q: Can I test my own browser's User-Agent?
A: Yes. The tool automatically pre-fills the input with your current browser's UA string so you can inspect it immediately without pasting anything.
Q: How can I use this for bot detection?
A: Bots and crawlers (Googlebot, Bingbot, etc.) have distinctive UA strings. Paste a suspicious UA from your access logs to identify whether it belongs to a known crawler, scraper, or headless browser.
Q: Why do some fields show "unknown"?
A: Some UA strings are minimal, non-standard, or deliberately obfuscated. When the parser cannot confidently identify a field (e.g. OS or device type), it shows "unknown" rather than guessing incorrectly.
Q: Does this tool send my User-Agent to a server?
A: No. All parsing is performed entirely in the browser. Your UA string is never sent to any server.