My User Agent

What is My User Agent?

🔍 Detect your browser's User Agent string and identify your browser, operating system, device type, screen resolution, and other system information instantly.

What is a User Agent?

A User Agent is a text string that your browser sends to websites to identify itself. It contains information about your browser name, version, operating system, device type, and rendering engine.

User Agent Format

Example: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

User Agent Components

• Mozilla/5.0: Historical compatibility identifier
• Platform: Operating system and architecture (Windows NT 10.0; Win64; x64)
• Browser Engine: AppleWebKit, Gecko, Trident
• Browser Name & Version: Chrome/120.0.0.0, Firefox/121.0, Safari/17.2

Why User Agents Matter

• Responsive Design: Websites detect mobile vs desktop to serve appropriate layouts
• Browser Compatibility: Sites can enable/disable features based on browser capabilities
• Analytics: Track which browsers and devices visitors use
• Security: Identify and block malicious bots
• Content Delivery: Serve optimized content for specific devices

Common Browsers

• Google Chrome: Most popular, Chromium-based (Blink engine)
• Mozilla Firefox: Privacy-focused (Gecko engine)
• Safari: Apple's browser (WebKit engine)
• Microsoft Edge: Chromium-based since 2020
• Opera: Chromium-based, built-in VPN

Operating Systems

• Windows: Windows NT 10.0 (Win 10), NT 11.0 (Win 11)
• macOS: Mac OS X 10_15, macOS 14.0
• Linux: Ubuntu, Fedora, Debian
• iOS: iPhone, iPad
• Android: Various versions and manufacturers

Privacy Considerations

User Agents can be used for browser fingerprinting to track users. Modern browsers are working to reduce the amount of identifying information in User Agent strings through initiatives like User-Agent Client Hints.

💡 Did You Know? All User Agents start with "Mozilla/5.0" for historical compatibility reasons, even though the original Mozilla browser is no longer used. This dates back to the early browser wars of the 1990s.