Browser

What Is My User Agent?

Check your browser user agent string. Instantly lookup the exact user agent your browser sends to websites.

Live Result

Detecting…

What is it?

A User-Agent string is a line of text that your web browser sends to every website you visit. It acts as a digital ID card, identifying your browser name, browser version, operating system, and device type.

Why this matters

Web servers read your User-Agent to determine what content to send back. For example, a website might serve a mobile-optimized layout if it detects "iPhone" or "Android" in the string, or block access if it detects an outdated browser.

Practical Use Cases

Developers debugging server-side routing logic that relies on device detection.
Security analysts reviewing server logs to identify potentially malicious automated scrapers (bots).
Users checking if their privacy extensions are successfully spoofing or stripping their User-Agent data.

Troubleshooting

My User Agent is missing details

Modern browsers are actively reducing the amount of information in the User-Agent string (called "User-Agent Reduction") to improve privacy and prevent fingerprinting.

Frequently asked questions

What is a user agent checker?

A user agent checker is a tool that reads the HTTP headers sent by your browser and displays the raw User-Agent string, allowing you to see exactly how your device identifies itself.

Can I change my user agent?

Yes. Browser developer tools let you override the user agent for testing purposes. Additionally, privacy extensions and specialized browsers can spoof the user agent.

Related Tools

Explore more diagnostics

Visit the DeviceScope homepage for a complete live dashboard, or browse all tools in the Browser category.