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User-Agent Parser

Parse user-agent strings into browser, engine, operating system and device hints for support and compatibility debugging.

Tool Workspace

Processing is intended to run locally in your browser whenever possible. Avoid pasting production secrets, access tokens, private keys or sensitive business data into any online tool unless you fully understand the risk.

Ready. Processing runs in your browser.

Core Features

  • Parse browser, engine, OS and device hints.
  • Explain why user-agent detection is imperfect.
  • Support debugging analytics and compatibility issues.
  • Link to browser and network references.

How to Use

  1. Paste a user-agent string copied from logs or DevTools.
  2. Run the parser and review browser, OS and device output.
  3. Treat results as hints rather than guaranteed identity.
  4. Use feature detection when browser behavior matters.

Common Errors

  • Assuming user-agent strings are always truthful.
  • Relying on browser detection instead of feature detection.
  • Misreading reduced or frozen user-agent values.
  • Ignoring mobile browser compatibility modes.

Real Developer Use Cases

  • Debugging browser-specific reports from logs.
  • Checking analytics classification issues.
  • Explaining support tickets that include a copied user-agent string.

Technical Explanation

User-agent strings were designed to identify client software, but they have become messy compatibility strings. Modern browsers may reduce or freeze parts of the value, and many strings include historical tokens. Parsing is useful for support and analytics context, but it should not replace capability checks for important application behavior.

FAQ

Is my input uploaded to your server?

Tool input is processed in the browser for these utilities unless a page explicitly states otherwise.

Can I use this with production secrets?

Do not paste production passwords, private keys, access tokens or sensitive business data into any online tool unless you fully understand the risk.

Why does this page include explanations below the tool?

Developer Data Tools is designed to help users understand the data problem, not just transform input and output.

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