🔍User Agent Parser

Parse and analyze browser user agent strings.

User Agent String

About User Agent Parser

Parse browser user agent strings to extract detailed information about the browser name and version, operating system, device type, and rendering engine. Paste any user agent string from server logs or HTTP headers and get a structured breakdown of all its components.

How to Use User Agent Parser

1
Paste a user agent string
Enter a user agent string from server logs, HTTP headers, or browser developer tools.
2
Parse
Click Parse to extract all components from the user agent string.
3
Review the details
See the browser name, version, OS, device type, and rendering engine in a structured format.

Common Use Cases

Analyzing server log entries to understand visitor browsers
Debugging browser-specific issues using user agent data
Identifying bot and crawler traffic in access logs
Testing conditional content delivery based on device type

Frequently Asked Questions

What is a user agent string?

A user agent string is a text identifier sent by browsers in the User-Agent HTTP header. It contains information about the browser, operating system, and device making the request.

Why are user agent strings so long and complex?

User agent strings accumulated extra identifiers over decades of browser history, with each new browser including previous browser names for compatibility. This is why Chrome's UA contains 'Mozilla', 'AppleWebKit', and 'Safari'.

Can it detect mobile devices?

Yes, the parser identifies mobile devices, tablets, and desktop computers based on keywords and patterns in the user agent string.