What is My User Agent? - Free Online Checker

Understanding User Agent Strings

A User Agent string is a text identifier that your web browser sends to every website you visit. It contains information about your browser type, version, operating system, and device. Web developers use this information to ensure websites display correctly across different browsers and devices.

What Information Does Your User Agent Reveal?

• Browser Information: The name and version of your web browser (Chrome, Firefox, Safari, Edge, etc.).
• Operating System: Your operating system and version (Windows, macOS, Linux, iOS, Android).
• Device Type: Whether you're using a desktop, mobile device, tablet, or other hardware.
• Rendering Engine: The engine used to display web pages (Blink, WebKit, Gecko, Trident).
• Architecture: Your device's processor architecture (x86, x64, ARM).

How User Agents Work

Every time your browser requests a web page, it includes the User Agent string in the HTTP headers. Websites use this information to serve appropriate content, apply browser-specific CSS fixes, enable or disable features based on browser capabilities, and provide mobile-optimized versions for mobile devices.

User Agent Structure

User Agent strings follow a specific format that includes the browser name, version, operating system, and various compatibility tokens. Modern browsers often include multiple identifiers for backwards compatibility, which is why User Agent strings can appear complex and contain seemingly redundant information.

Privacy Considerations

While User Agent strings are essential for web compatibility, they can also be used for browser fingerprinting to track users across websites. Modern browsers are working to reduce the amount of identifying information in User Agent strings while maintaining compatibility with existing websites.

Why Check Your User Agent?

• Web Development: Test how websites detect your browser and ensure proper functionality.
• Troubleshooting: Diagnose browser-specific issues and compatibility problems.
• Privacy Analysis: Understand what information your browser reveals to websites.
• Feature Detection: Verify browser capabilities and supported technologies.
• Security Research: Analyze browser fingerprinting and tracking techniques.

Quick User Agent Lookup

Use QuickTooly.com's User Agent tool to instantly discover your browser's User Agent string along with detailed parsed information about your browser, operating system, and device capabilities. Our tool provides comprehensive analysis without storing any personal data.

Whether you're debugging web compatibility issues, researching browser capabilities, or simply curious about what information your browser shares with websites, our User Agent analyzer gives you all the details in an easy-to-understand format.