What Is My User-Agent
Show your browser's user-agent string with a quick breakdown of browser, OS, and device class — runs entirely in your browser.
Quick answer: Show your browser's user-agent string with a quick breakdown of browser, OS, and device class — runs entirely in your browser.
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Frequently asked questions
- What is a user-agent?
- A header your browser sends with every HTTP request that identifies the browser, version, operating system, and device. Servers use it to render different pages or send compatible responses.
- How do I check my user-agent?
- It's printed at the top of this page. Click Copy to put it on your clipboard.
- Why is the user-agent important?
- Servers use it to deliver mobile vs desktop layouts, send the right software updates, and gather analytics. It also lets a website know if you're using an outdated browser.
- Can I change my user-agent?
- Yes — most browser dev tools let you spoof it. Note that doing so often breaks sites that send tailored HTML or assets based on the UA.
- What's the difference between user-agent and headers?
- The user-agent IS one of the request headers. Other common ones include Accept, Accept-Language, Cookie, and Authorization.
- Is the user-agent privacy-sensitive?
- Somewhat — combined with other signals it contributes to browser fingerprinting. Modern browsers (Chrome, Firefox) increasingly send a reduced UA to push back on that.
- Why does a site see me as mobile or desktop?
- It looks for keywords in the UA: 'Mobile', 'iPhone', 'Android' for mobile, 'Windows', 'Macintosh', 'X11' for desktop. The calculator above uses the same approach.
- How do I detect browser and OS?
- Look for 'Firefox/', 'Chrome/', 'Edg/', 'Safari Version/' for browsers, and 'Windows NT', 'Mac OS X', 'Android', 'iPhone OS' for the OS. The tool above does this for you.
- What is a bot user-agent?
- Search engines and crawlers identify themselves with strings like 'Googlebot', 'Bingbot', 'facebookexternalhit'. Servers can serve them differently — but check before assuming a UA isn't being spoofed.
- Can I copy and share my user-agent?
- Yes — click Copy. Paste it into a support ticket, a forum post, or a bug report so the maintainer can reproduce in the same environment.