User-Agent Parser

Overview

• Parses a User-Agent string, such as one found in an HTTP request header, and breaks it down into browser name, version, rendering engine, OS, device information, and CPU architecture.

• Fields that cannot be recognized are shown as "Unknown" rather than causing an error, so even unsupported User-Agent strings are handled safely.

• Many desktop User-Agent strings do not include device vendor/model information, so device information is shown as "Unknown" in that case.

Usage

1. 1

   Paste the User-Agent string you want to parse into the input field.

2. 2

   Click "Parse".

3. 3

   Browser, engine, OS, device, and CPU information is displayed.

Example

Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17.0 / OS: iOS 17.0 / Device: Apple iPhone

Use Cases

• Investigating trends in visitors' browsers and OSes from User-Agent strings recorded in access logs

• Checking how a real User-Agent string is parsed while implementing browser or device detection logic

• Identifying a bug reporter's environment (browser, OS, device) from the User-Agent string included in their report

FAQ

Notes

• Since a browser or app can set its User-Agent string to anything, it may be spoofed (differ from the actual environment). Do not treat the parsed result as absolute fact.

• Entering an unsupported or malformed User-Agent string does not cause an error; the affected fields are simply shown as "Unknown".

• The parsed result exists only on the page and is lost on reload.