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What Is My User Agent?

Your browser sends a user agent string to every website you visit. It reveals your browser name, version, operating system, device type, and rendering engine. See exactly what websites know about your browser below.

Your User Agent String

Browser

Name

—

Version

—

Engine

—

Engine Ver

—

Operating System

—

Version

—

Device Type

—

Architecture

—

Browser Capabilities

Language

—

Languages

—

Do Not Track

—

Screen

—

Viewport

—

Color Depth

—

Timezone

—

Supported Features

What Is a User Agent?

A user agent is a string of text your browser sends to every website you visit in the HTTP request header. It identifies your browser, version, operating system, and rendering engine to the server so the website can serve the appropriate content and layout for your device.

While user agents were originally designed for compatibility purposes, they are now commonly used for tracking. Combined with other browser data like screen resolution, installed fonts, and canvas fingerprint, your user agent contributes to a browser fingerprint that can identify you across websites without using cookies.

Most browsers allow you to modify or spoof your user agent string. Privacy-focused browsers like Brave and Firefox can be configured to send a generic or randomized user agent to reduce fingerprint uniqueness.

How to Change Your User Agent

Chrome Developer Tools

Open DevTools (F12), click the three dots menu, select More Tools then Network Conditions. Uncheck Use browser default and select a user agent from the list or enter a custom one.

Firefox about:config

Type about:config in the address bar and search for general.useragent.override. Create a new string preference with your desired user agent value to override the default for all sites.

Browser Extensions

User agent switcher extensions are available for Chrome, Firefox and Edge. They allow you to switch between common user agent strings or set a custom one without modifying browser settings directly.

Frequently Asked Questions

Can websites track me using my user agent?

Yes. Your user agent is one of many signals used to build a browser fingerprint. When combined with screen resolution, installed fonts, canvas rendering and other browser properties, it creates a unique identifier that can track you across sites without cookies.

Does changing my user agent make me anonymous?

Partially. Changing your user agent to a common one reduces your fingerprint uniqueness but does not make you fully anonymous. Your IP address, canvas fingerprint and other signals can still identify you. A VPN combined with a privacy browser provides better protection.

Why do websites need my user agent?

Websites use user agents for compatibility — serving mobile layouts to mobile devices, avoiding features unsupported by older browsers, and adjusting content for different operating systems. This was the original purpose before it became a tracking mechanism.

What browser has the best user agent privacy?

Brave browser provides the strongest user agent privacy by default. It randomizes certain browser properties and presents a generic user agent that is harder to fingerprint uniquely. Firefox with strict privacy settings is a strong alternative.

What is the Gecko rendering engine?

Gecko is the rendering engine used by Firefox and its derivatives. Blink is used by Chrome, Edge and most other modern browsers. WebKit is used by Safari on Apple devices. The rendering engine is a key component of your browser fingerprint.

Can VPNs hide my user agent?

No. A VPN only hides your IP address and encrypts your traffic. Your user agent is part of the HTTP request header sent by your browser, not your network connection. Only browser settings or extensions can modify the user agent string.