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User Agent Parser

Parse and decode browser user-agent strings

User Agent String

Populated from your browser. Edit to test any UA string.

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About This Calculator

The User-Agent string is an HTTP header sent by browsers and HTTP clients that identifies the application, operating system, device type, and rendering engine making the request. This tool parses any User-Agent string and breaks it down into its components: browser name and version, rendering engine, operating system, device type (desktop, mobile, tablet), and whether it belongs to a known bot or crawler. Developers use User-Agent analysis for browser-specific debugging, responsive design testing, bot detection, analytics filtering, and understanding their audience device distribution. The tool also displays your current browser User-Agent string.

How to Use

1
View or paste a user agent
See your current user-agent string or paste one to analyze.
2
Review parsed details
View the detected browser, OS, device type, and engine information.
3
Copy the results
Copy parsed details for debugging or analytics documentation.

Frequently Asked Questions

Q. Why are User-Agent strings so long and confusing?

User-Agent strings grew complex due to browser wars — browsers added tokens from competing browsers to avoid being blocked by websites that checked for specific browsers. Chrome identifies itself as Mozilla/Safari/Chrome for historical compatibility. This legacy makes parsing User-Agents non-trivial.

Q. Is User-Agent reliable for browser detection?

User-Agent strings can be spoofed and are increasingly unreliable. Chrome is reducing User-Agent granularity via the User-Agent Reduction initiative. For feature detection, use JavaScript feature checks instead. For analytics, User-Agent Client Hints (UA-CH) API provides structured, privacy-conscious browser data.

Q. How do I detect bots using User-Agent strings?

Major bots identify themselves: Googlebot, Bingbot, Slurp (Yahoo), and others include their name in the User-Agent. However, malicious bots often spoof legitimate browser User-Agents. Combine User-Agent analysis with IP reputation, request patterns, and reverse DNS verification for reliable bot detection.

Disclaimer: Results are for informational purposes only and do not constitute professional advice. Always consult qualified professionals for important decisions.

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