Browser User Agent Checker
Detect and analyze your browser's user agent string. Get detailed information about your browser, operating system, device type, and browser capabilities.
Your Current Browser Information
Detected in real-time from your browser
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Test Any User Agent String
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Popular Browser User Agents
Search Engine Bot User Agents
What is a User Agent String?
A User Agent (UA) string is a text string that web browsers and other applications send to web servers to identify themselves. It's like a digital ID card that tells websites what browser you're using, what version, what operating system, and sometimes even what device type (desktop, mobile, tablet).
When you visit a website, your browser automatically sends this information in the HTTP request headers. Websites use this data to deliver the most compatible version of their content, optimize layouts for different screen sizes, or track browser usage statistics.
User Agent String Structure
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Frequently Asked Questions
Why do all user agents start with "Mozilla/5.0"?
This is a historical compatibility convention. Early browsers used "Mozilla" to indicate support for certain features. Modern browsers continue this tradition to ensure compatibility with older websites.
Can I change my user agent?
Yes! Most browsers allow you to change the user agent through developer tools or extensions. In Chrome/Edge, press F12, go to Network tab, and you can override the user agent.
Do search engines use user agents?
Yes! Search engine bots have specific user agents (Googlebot, Bingbot, etc.). Websites can detect these and serve different content to search engines versus regular users.