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Guide

What Is a User-Agent?

A user-agent string is request metadata that describes the software making an HTTP request.

Parse a user-agent string

What it can contain

User-agent strings often include browser family, browser version, rendering engine, operating system, device type, app name, or bot name.

They are useful for debugging compatibility, rough analytics, and identifying obvious crawlers.

Why it is imperfect

User-agent strings are sent by the client and can be spoofed, shortened, frozen, or intentionally generic.

Treat parsed user-agent data as a hint. It is not a secure identity signal and should not be used as the only fraud or access-control signal.

Key terms

Browser
Application family such as Chrome, Safari, or Firefox
Engine
Rendering engine such as WebKit, Blink, or Gecko
Bot
Crawler or automated client signal when detectable

Examples

Browser string

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 Chrome/148.0.0.0 Safari/537.36 A browser-style user-agent string with platform and engine hints. Parse this browser string
User agent parser Parse a browser, crawler, app, or bot user-agent string. HTTP request headers explained Understand where user-agent appears in the request header set. View request headers Inspect the user-agent sent by your current browser.

FAQ

Can a user-agent be fake?

Yes. Clients control the user-agent string, so it can be changed or spoofed.

Why do many user agents start with Mozilla?

It is a long-lived compatibility convention. Many modern browsers include Mozilla/5.0 even though they are not the old Mozilla browser.