What is my user agent?
Your browser’s user agent string is:
Browser details
- Browser
- Unknown
- Engine
- WebKit
- Operating system
- Unknown
- Device type
- Bot or script
- Screen
- –
- Window
- –
- Language
- –
- Timezone
- –
- Cookies enabled
- –
- Do Not Track
- –
What is a user agent string?
Every time your browser loads a page it sends a User-Agent header that describes itself. Websites use it to choose a mobile or desktop layout, offer the right app download, work around browser bugs and count which browsers visitors use. Command-line tools send one too: try curl https://www.ferntool.com/api/user-agent.
A typical Chrome string reads Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/… Safari/537.36. Most of it is legacy: “Mozilla”, “KHTML, like Gecko” and “Safari” remain for compatibility with old sites. The parts that matter are the platform in brackets and the final browser token.
Why browsers are shrinking the user agent
Detailed user agents help trackers fingerprint you, so Chrome, Edge and Safari now freeze or reduce the details, such as the exact OS version. Sites that genuinely need more ask for it through User-Agent Client Hints. That’s why Windows 11 shows as Windows NT 10.0 and macOS is often stuck at 10_15_7.
Learn more in our guide what is a user agent?
Frequently asked questions
What is a user agent?
A user agent string is a line of text your browser sends with every request, naming the browser, its version, the rendering engine and your operating system, so websites can send pages that work on your device.
Why does my user agent say Mozilla?
Historical reasons. In the 1990s sites sent better pages to Netscape (code-named Mozilla), so other browsers started claiming to be “Mozilla compatible”. Nearly every browser still begins its user agent with Mozilla/5.0.
Why does Windows 11 show as Windows NT 10.0?
Browsers froze the Windows version in the user agent at 10.0, so Windows 10 and 11 look identical. Sites that need to tell them apart use the newer User-Agent Client Hints instead.
Can I change my user agent?
Yes. Browser developer tools (Chrome: DevTools → Network conditions) and extensions can override it. It changes how sites detect your device but does not hide your IP address or make you anonymous.
Does my user agent identify me?
Not on its own; millions of people share the same one. Combined with screen size, fonts and other details it becomes part of a browser fingerprint that trackers can use.