What Is My User Agent?
Your browser introduces itself to every website with a line of text called a user agent. Here is yours, and what it says.
Your user agent
This tool runs in your browser and needs JavaScript turned on.
What it says about you
Client hints
Checking what your browser offers.
Paste one from a server log or a support ticket. It is decoded in your browser and not sent anywhere.
What a user agent is
Each time your browser asks for a page, it sends a header called User-Agent. It names the browser, its version, and the operating system. Sites use it to send the right version of a page, to work around bugs in specific browsers, and to count which browsers their visitors use.
Why it looks so strange
Almost every user agent starts with Mozilla/5.0 and mentions several browsers at once. That is history, not a mistake. For years, sites checked the user agent and sent their best pages only to browsers they recognized. New browsers responded by claiming to be the ones already on the list. The result is that Chrome says it is also Safari, Edge says it is also Chrome, and all of them say they are Mozilla.
The parts that matter are usually near the end, such as Chrome/141.0.0.0 or Firefox/143.0, and the system details inside the first set of brackets.
Why it is less precise than it used to be
A detailed user agent helps sites tell visitors apart, which is a privacy problem. Browsers now freeze parts of it. Chrome reports a rounded version and a generic system. Safari on a Mac reports an old macOS version no matter which one you run. Windows 10 and Windows 11 look the same. So the "System version" above can be vaguer than the truth, on purpose.
Client hints
Chrome and other browsers built on it offer a newer system called client hints. The browser sends a short, low-detail description by default, and a site must ask for anything more, such as the exact version or device model. The section above shows what your browser provides. Firefox and Safari do not support it.
Can I change it?
Yes. Browser developer tools can send a different user agent, which is how developers test mobile layouts on a computer. Because it is so easy to change, a user agent is a hint about a visitor and never proof. The other details a site sees about your connection are on the home page, and what your IP address reveals explains how they fit together.