How to Use the User Agent Parser & Client Inspector
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1
Click "Use My Current Browser" to auto-detect your active device user-agent string.
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Or paste any custom user-agent string from server access logs or bug reports.
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3
Inspect detailed breakdown cards: Browser name and version, Rendering Engine, OS, Device type, and CPU.
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Copy the parsed breakdown as a JSON summary.
Practical Example & Use Case
Common Real-World Scenario
Diagnosing bug reports from users by checking their exact browser version and operating system from error logs.
Technical Notes & Limitations
Browser Engine Architecture
All parsing occurs locally in JavaScript using regular expression signatures without contacting third-party databases.
Frequently Asked Questions
What is a User-Agent header?
A characteristic string that web browsers and crawlers send in HTTP requests to identify their software, version, and host OS to web servers.