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User Agent Parser

Break down a user-agent string into browser, engine, operating system and device.

To parse a user-agent string, paste it above and the browser, rendering engine, operating system and device are identified. This is the quickest way to decode the strings in your server logs when investigating a browser-specific bug.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Why does every user agent start with Mozilla/5.0?

Legacy browser sniffing. In the 1990s servers checked for "Mozilla" before sending modern HTML, so every browser started claiming it. The prefix has been meaningless for decades but removing it would break old sites.

How to use the user agent parser

  1. 1Enter or paste your user agent string.
  2. 2The result appears immediately — copy or download it.

Embed this tool

Put the working user agent parser on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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