User Agent Parser

What the User Agent Parser does

The User Agent Parser breaks down a raw user agent string into its readable components — browser name and version, rendering engine, and operating system — turning a cryptic string of technical tokens into information you can actually use.

How to use it

1. Paste a user agent string into the box, or click Use my browser's to load your own automatically.
2. Click Parse User Agent.
3. Review the identified browser, engine, and operating system.

Common uses

• Debugging a browser-specific rendering or compatibility bug reported by a user.
• Checking what browser and OS a support ticket's included user agent string represents.
• Verifying your own browser's reported user agent during cross-browser testing.
• Understanding a log file entry that only recorded a raw user agent string.
• Confirming a bot or crawler's user agent matches what it claims to be.

Good to know

User agent strings can be spoofed or customized by the user, browser extensions, or automated tools, so parsing one tells you what a client claims to be, not necessarily what it verifiably is — useful for debugging and analytics, but not a reliable method for security-critical bot detection on its own.

User agent strings have accumulated a famously messy history — due to decades of browsers spoofing each other's identifiers for compatibility reasons (a legacy of the early browser wars), a single string often contains references to multiple browser engines even though only one actually applies. This is exactly why dedicated parsing logic, rather than simple text searching, is needed to reliably extract the actual browser and OS from what looks like a chaotic string of technical tokens.