What Is My User Agent?

User Agent

A User Agent (UA) is a text string your browser sends to websites to identify itself. It tells the website what browser you’re using, your operating system, device type, and sometimes additional details such as rendering engine or version numbers. Every time you open a webpage, your browser includes a User Agent string in the HTTP request header.

This helps websites deliver the correct layout, scripts, and compatibility settings for your device.

Why User Agent Matters

Your User Agent influences how websites behave and what version of a site you see. It helps servers adjust content, troubleshoot issues, detect bots, and analyze visitor technology data.

Why Knowing Your User Agent Is Useful:

• Helps developers reproduce bugs
• Detects browser compatibility issues
• Confirms whether a site is showing mobile/desktop content correctly
• Important for analytics and device testing
• Helps identify if a bot or script is accessing a site
• Useful for troubleshooting security or login problems