User Agent Checker — Free Online Tool
See your browser, operating system, and full user agent details.
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About User Agent Checker
The User Agent Checker reveals the user agent string your browser sends with every request and breaks it down into readable details. It identifies your likely browser and operating system and lists your platform, language, cookie status, connection state, CPU threads, and Do Not Track setting.
This information is helpful for debugging website issues, confirming how your browser presents itself to servers, and understanding compatibility. Everything is read locally from the navigator object, so the details reflect your own device and are never sent anywhere.
How to Use User Agent Checker
- Open the page to see your full user agent string at the top.
- Review the breakdown table for browser and system details.
- Click Copy User Agent to copy the raw string.
- Use the details when reporting bugs or testing compatibility.
Key Features
Displays your complete user agent string
Detects likely browser and operating system
Shows platform, language, and cookie status
Reports online state, CPU threads, and Do Not Track
One-click copy of the user agent
Frequently Asked Questions
What is a user agent string?
It is a line of text your browser sends to websites describing its name, version, rendering engine, and operating system.
How accurate is the browser and OS detection?
Detection is based on patterns in the user agent string, which is reliable for common browsers but can be simplified or spoofed by some browsers.
What does Do Not Track indicate?
It shows whether your browser is set to request that websites not track you, though honoring that request is up to each site.
Is my information collected?
No. All details are read locally in your browser and are not transmitted or stored by this tool.