What Is My Browser?

What Is a User Agent String?

Your user agent is like an ID card your browser shows to every website you visit. It's a text string that tells websites what browser you're using, your operating system, and what type of device you have.

You can't see your user agent normally, but it's sent automatically with every web request. Think of it as your browser introducing itself to websites.

What Information Your User Agent Reveals

Your user agent string contains several pieces of information:

• Browser name and version (Chrome 119, Firefox 118, Safari 17)
• Operating system (Windows 10, macOS Ventura, Android 13)
• Device type (desktop, mobile, tablet)
• Rendering engine (WebKit, Gecko, Blink)

For example, a typical user agent might say you're using Chrome 119 on Windows 10 with a 64-bit processor.

Why Websites Collect User Agent Data

Websites use your user agent for two main reasons. First, they need to know what your browser can handle. Different browsers support different features, so websites adjust their code accordingly.

Second, companies use user agents for analytics. They track which browsers and devices are popular to help make business decisions about what to support.

Privacy Concerns and Browser Fingerprinting

Your user agent alone isn't a huge privacy risk, but it's part of a bigger picture. Websites can combine your user agent with other information to create a "browser fingerprint."

This fingerprint might include your screen resolution, installed fonts, time zone, language settings, and enabled plugins. Together, these details can identify you uniquely, even without cookies.

Browser fingerprinting lets websites track you across different sites, which many people find concerning.

How to Change or Spoof Your User Agent

You can change your user agent if you want more privacy or need to test how websites work with different browsers.

Most browsers let you modify your user agent through developer tools. Press F12, open the console, and look for device emulation options.

Browser extensions can also spoof your user agent automatically. Popular options include User-Agent Switcher for Chrome and Firefox.

Keep in mind that changing your user agent might break some websites that depend on detecting your real browser.