What browser am I using?
Browser name and version, operating system, language, touch screen and cookies: everything detected instantly, ready to copy and paste into a support ticket.
Why does tech support always ask for your browser and version?
Many website problems come down to the browser itself: an outdated version of Chrome or Firefox may not support newer features, blocked cookies can break your login, and some bugs only show up on a specific operating system. Sharing your browser, its version and your OS lets support engineers reproduce the issue exactly as it happens on your device, instead of going back and forth over email with a dozen questions. This page gathers everything they typically ask for, and the copy button puts it on your clipboard in one click.
What is the user agent, and why does it look so strange?
The user agent is the identification string your browser sends to every website it visits. For historical reasons it's full of names that seem out of place: nearly every browser claims to be "Mozilla/5.0", and Chrome even mentions "Safari" for compatibility with older sites. That's why the actual brand name has to be extracted with careful rules, which is exactly what this tool does, while also showing you the full raw string in case you need to report it verbatim.
The user agent is a layered lie
Every modern browser declares itself Mozilla, then Chrome, then Safari, even when it is none of the three. The reason is historical: in the 1990s sites sent the good version only to Netscape (codenamed Mozilla), and every new browser had to impersonate the previous one to avoid getting the worse version.
The result is that today Edge claims to be Chrome, Safari and Mozilla at once, and the string is unreadable. It is also why browsers are cutting back what they write in it: it had become a source of identification more than of information.
Why support always asks for browser and version
It is not bureaucracy: the same page behaves differently on different engines, and some features reach Chrome months before Safari. A problem that appears on one browser only is valuable information, because it narrows the field immediately.
The other half of the answer is the version: a two-year-old browser lacks features the site takes for granted, and the fault disappears with an update. Knowing version and operating system saves half an hour of blind attempts, which is why it is the first question.
What a site knows without asking
A site sees far more than the browser string: language, time zone, screen resolution, number of processors, whether the device has touch, and dozens more details. Taken one by one they are trivial; combined they become a fingerprint identifying one device among millions.
The technique is called fingerprinting, and it works without cookies and in private browsing. Defending against it completely is hard, but some browsers deliberately reduce the precision of what they expose, which is why some values here may come out rounded.
Nearby tools
To try out the keyboard you are using there is Keyboard test. If the problem is the screen, look at Dead pixel test, and for camera and microphone Webcam test.