Browser User-Agent Checker
Instantly view the User-Agent string and browser information reported by your current web browser.
Your Browser User-Agent
Your browser provides this information through the navigator.userAgent property.
What Is a User-Agent?
A User-Agent is a browser-provided string that identifies information about the client making a web request. Websites and web services can use User-Agent information as one signal when determining how to handle a request.
A User-Agent string can contain information associated with the browser, browser engine, operating system, device, and compatibility.
What Does a User-Agent String Look Like?
The exact format varies between browsers, operating systems, and devices. Modern browsers may also reduce or standardize some information exposed through traditional User-Agent strings.
How to Use This Browser User-Agent Checker
- Open the tool in your browser.
- Your User-Agent string is detected automatically.
- Review the browser, operating system, device, and platform information.
- Select Copy User-Agent if you need to use the string elsewhere.
Why Check Your User-Agent?
- Identify the User-Agent string reported by your browser.
- Help troubleshoot browser-specific website behavior.
- Provide browser information when reporting technical issues.
- Check browser and operating-system details for testing.
- Copy the User-Agent string for development and debugging.
User-Agent and Web Development
Developers may encounter User-Agent strings while working with HTTP requests, analytics, compatibility testing, server logs, APIs, and browser-specific behavior.
However, User-Agent information should not be treated as a perfect or permanent identifier. Browsers can change the information they expose, and some User-Agent details may be intentionally reduced or standardized.
User-Agent vs Browser Detection
Browser detection based solely on User-Agent strings can be unreliable. A User-Agent string is primarily a compatibility and client-identification mechanism, and different browsers may contain overlapping or historical identifiers.
For modern web development, feature detection is generally preferable when the goal is to determine whether a browser supports a particular capability.
User-Agent Client Hints
Modern browsers may also expose additional browser and platform information through User-Agent Client Hints. These mechanisms can provide more structured information than relying entirely on the traditional User-Agent string.
Common Uses for a User-Agent String
Technical Support
A support team may ask for your browser and User-Agent information when troubleshooting compatibility or website problems.
Web Testing
Developers can use User-Agent information while testing how applications behave across different browsers and operating systems.
Server Logs
Web servers may record User-Agent strings as part of request information, allowing administrators to analyze the types of clients accessing a service.
Debugging
Checking your current User-Agent can help developers reproduce browser-specific issues.
Important Limitations
- The User-Agent does not provide a guaranteed unique identity.
- Browser information can be changed or reduced by browser privacy features.
- Some browser and operating-system information may be generalized.
- User-Agent strings can contain compatibility identifiers that do not directly describe the browser in a simple way.
- Device detection based on User-Agent alone may not always be accurate.
Frequently Asked Questions
What is my current User-Agent?
Your current User-Agent is displayed automatically at the top of the checker when you open this page.
How do I find my browser User-Agent?
Open this Browser User-Agent Checker and the browser's current navigator.userAgent value will be displayed automatically.
Does this tool send my User-Agent to a server?
No. The tool reads the User-Agent information directly from your browser using JavaScript and does not need to send it to a server.
Can I copy my User-Agent?
Yes. Select the Copy User-Agent button to copy the displayed User-Agent string to your clipboard.
Is a User-Agent a unique identifier?
No. A User-Agent string is not designed to be a guaranteed unique identifier and may be shared by many users with similar browsers and devices.
Why does my User-Agent contain Mozilla?
Many modern browsers retain historical compatibility tokens such as Mozilla in their User-Agent strings. Its presence does not necessarily mean that the browser is Mozilla Firefox.
Can User-Agent information change?
Yes. It can vary after browser updates, operating-system changes, device changes, privacy changes, browser settings, or changes to how browsers expose client information.
Related Tools
Check Your Browser User-Agent
View and copy the User-Agent string reported by your current browser instantly.
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