What Is My User Agent
See your browser's user agent string and the device details it reveals.
How to use the What Is My User Agent
- Open the page — your details are read from your browser instantly.
- Read your browser, OS, screen and more.
- Copy the user agent string if you need it.
About the What Is My User Agent
Your browser sends a user agent string with every request — a line of text that names the browser, its version and the operating system it is running on. This tool reads that string directly from your own browser and, alongside it, shows what the string and the browser reveal: the detected browser and OS, your platform and languages, screen and viewport size, pixel ratio, CPU cores, touch support, and whether cookies and Do Not Track are on.
It is handy for a few everyday jobs: grabbing your exact user agent to paste into a bug report, checking what a website sees when it decides which layout or download to give you, or confirming your screen and viewport size while testing a responsive design. Everything is read on the page with JavaScript — nothing is sent to a server, so it is simply reporting what your own browser already knows about itself.
Bear in mind the user agent is not proof of anything: it can be changed or spoofed, and modern browsers deliberately freeze parts of it for privacy, so two different setups can report the same string. To see what your server-side requests look like instead, use the HTTP header checker, and to find your public IP see what is my IP.
Frequently asked questions
What is a user agent string?
It is a line of text your browser sends with each request, naming the browser, its version and your operating system, so sites can adapt what they serve.
Is any of this sent to your server?
No. Everything shown is read from your own browser with JavaScript and stays on your device. The page is only reporting what your browser already exposes.
Why does my browser or OS show as "Unknown"?
Modern browsers freeze or trim the user agent for privacy, so detection is not always exact. The raw string is still shown so you can read it yourself.
Can a user agent be faked?
Yes. It is easily changed by extensions, developer tools or bots, so it should never be treated as proof of who or what is visiting.
How do I copy my user agent?
Use the copy button next to the user agent string at the bottom of the results.