User Agent Parser

Inspect browser user agent strings and extract practical hints for debugging logs, analytics, bot traffic, and compatibility reports.

Reference

User Agent notes

What is User Agent?

A user agent string is a browser-provided text identifier that often includes browser, rendering engine, operating system, device, and compatibility tokens.

How does the User Agent tool work?

The parser scans the user agent string for common browser, engine, operating system, device, and bot markers and returns practical debugging hints.

When should you use User Agent?

  • Interpreting browser strings from access logs
  • Checking whether traffic looks like a crawler or bot
  • Debugging browser-specific reports
  • Understanding device hints during support triage

What are the limitations of User Agent?

  • User agent strings can be spoofed
  • Modern browsers reduce or freeze some user agent details
  • Detection is heuristic and not a security boundary

User Agent examples

chrome Mozilla/5.0 ... Chrome/... -> Chrome, desktop/mobile hints
bot Googlebot/2.1 -> Likely bot
mobile iPhone Safari UA -> iOS/iPadOS mobile hint
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