What Is My User Agent
Free, fast, and easy to use.
The What Is My User Agent tool instantly shows the full user agent string your browser sends to websites. No signup required — just open the page and see your result immediately.
This information is useful for troubleshooting network issues, testing responsive designs, or confirming what data your browser exposes to the websites you visit.
How It Works
- Open the tool page
- Your result is detected and displayed automatically
Best Practices
- Refresh the page if you've changed networks or browser settings and want an updated reading
- Use this information to verify VPN or proxy connections are working as expected
This tool is free to use with no signup required.
Frequently Asked Questions
What is a user agent?
A user agent is a text string your browser automatically sends to every website you visit, identifying details like your browser name, version, and operating system.
Why would I need to check this?
Common reasons include troubleshooting browser-specific website issues, verifying a script or bot is correctly identifying itself, or providing details to a developer debugging cross-browser compatibility.
Is my data saved anywhere?
No — this simply displays your browser's current user agent string and does not store or log the information.
Can websites identify me personally from my user agent?
No — a user agent string reveals browser and OS details, not personal identity, though combined with other data points it can contribute to broader device fingerprinting techniques used by some tracking systems.
Why do some websites behave differently based on my user agent?
Sites sometimes use the user agent to serve mobile-optimized layouts, apply browser-specific compatibility fixes, or (in some cases) restrict access based on outdated or unsupported browsers.
Can I change or spoof my user agent?
Yes — most browsers offer developer tools or extensions that let you manually override the reported user agent string, often used for testing how a site behaves for different browsers or devices.
Is this useful for web developers testing browser compatibility?
Yes — confirming exactly what user agent string a browser sends is a common troubleshooting step when debugging browser-specific rendering or functionality issues.
Why does my user agent string look so complicated?
Historically, browsers added extra compatibility tokens (mimicking older browsers) to avoid being blocked by sites with outdated browser-detection logic, resulting in famously convoluted user agent strings that persist for legacy compatibility today.
Does my user agent change if I update my browser?
Yes — the user agent string typically includes your browser's version number, so it updates automatically whenever you install a browser update.
Is checking my user agent free and unlimited?
Yes, completely free with no signup, no limits, and no software to install.
The What Is My User Agent tool displays the exact user agent string your browser currently sends to every website you visit.
What a User Agent String Actually Is
Every time a browser requests a page, it identifies itself to the server through a short text string containing the browser name, version, rendering engine, and operating system. Servers use this to decide how to serve content — for example, choosing a mobile-optimized layout, or checking whether your browser supports a particular feature before serving code that depends on it.
Common Reasons to Check Your Own User Agent
- Debugging browser-specific issues — when a website behaves differently than expected, confirming the exact user agent string helps developers reproduce and diagnose the problem.
- Verifying browser extensions — some privacy extensions modify or spoof the user agent string, and checking confirms whether that modification is actually taking effect.
- Testing responsive or mobile detection code — developers building user-agent-based device detection can verify their own current string matches what their code expects to parse.
A Note on Accuracy
Modern browsers are increasingly reducing the specificity of the default user agent string for privacy reasons (a trend often called "user agent reduction"), meaning the string shown may contain less granular version detail than it once did — this is an intentional privacy improvement, not a detection error.
