User Agent Checker – View Your Browser's User Agent String
View your browser user agent string and device information.
How to use this user agent checker
- Open this page and your full user agent string is detected and displayed automatically
- View the parsed summary showing your detected browser, operating system, and device type
- Click the copy button to copy the raw user agent string to your clipboard
- Paste the copied string into a bug report, support ticket, or compatibility test as needed
- Reload the page after switching browsers or devices to see how the string and parsed values change
Frequently Asked Questions
What is a user agent?
A user agent is a string that identifies your browser and operating system to websites. It helps websites deliver content optimized for your device.
Can websites track me using my user agent?
User agents provide general information about your browser and device, but cannot uniquely identify you. However, combined with other data, they can be used for fingerprinting.
Can I change my user agent?
Yes, some browsers allow you to change your user agent through developer tools or extensions. This is useful for testing how websites appear on different devices.
Related Tools
A user agent checker lets you instantly see the exact user agent string your browser sends to every website you visit, broken down into readable browser, operating system, and device type information. This tool is useful for web developers debugging browser-specific rendering issues, QA testers verifying that device detection scripts work correctly, support staff asking a customer to paste their user agent to diagnose a bug, and anyone curious what their browser reveals about their setup. Because the same string is used by servers and analytics tools for browser sniffing and compatibility checks, seeing it in plain view helps you understand exactly what information your browser is disclosing on every request, without needing to open developer tools.
What is user agent checker?
This tool reads the navigator.userAgent property, a string every browser exposes through JavaScript that identifies the browser name, rendering engine, and operating system in a compact format. It then runs simple pattern matching against that string, checking for substrings like 'Chrome', 'Firefox', 'Safari', 'Edg', or 'Windows', 'Mac', 'Android', 'iOS' to classify the browser, operating system, and device type into a readable summary. Because the raw string follows an inconsistent, historically layered format shared across browser vendors, parsing it involves checking for specific known keywords rather than a single reliable standard. All of this happens directly in your browser via JavaScript - the user agent string never has to be sent anywhere for this tool to read and parse it.
Common use cases
- Web development debugging: Checking exactly what user agent string a browser sends when diagnosing a rendering or compatibility bug
- Customer support: Asking a user to share their user agent string to help identify the cause of a browser-specific issue
- QA and cross-browser testing: Confirming that a site or script correctly detects browser, OS, and device type across test environments
- Analytics and logging verification: Comparing the raw user agent against what a server log or analytics dashboard recorded
- Extension and spoofing checks: Verifying whether a user agent switcher extension is successfully changing the reported string
- General curiosity: Seeing exactly what a browser reveals about itself to every website it connects to
Limitations and common mistakes
- User agent strings are easily spoofed by browser extensions, developer tools, or command-line flags, so the value shown is not proof of the actual browser in use
- Modern Chrome and Edge versions are moving toward a frozen, less detailed user agent string as part of User-Agent Reduction, so version and OS details may be less precise than in older browsers
- The browser, OS, and device detection in this tool uses simple substring matching, which can misclassify newer or less common browsers, forks, or embedded webviews
- Device type detection (mobile vs. tablet vs. desktop) relies on keywords that not all browsers include consistently, so results may be inaccurate on some devices
- Safari on iOS and iPadOS can report a user agent nearly identical to desktop Safari, making device type especially unreliable on Apple hardware