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What Is My Browser
What is my browser? This tool answers that question the moment the page loads. It detects your browser name and version, your operating system, the rendering engine, your screen and viewport size, your language, and whether cookies and JavaScript are turned on — then shows your full user-agent string. Press Copy details to save the whole readout for a support ticket or a bug report.
Nothing is sent or stored — the detection runs entirely in your browser.
Your browser at a glance
The panel shows the browser and operating system this page detected. The full table on the left has every detail, including the user-agent string itself.
How it works
Every time your browser asks a website for a page, it introduces itself with a line of text called the user-agent string. It names the browser and its version, the operating system, and the rendering engine, and it looks something like this: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36. The "Mozilla/5.0" at the start is a historical leftover from the early web; the useful part is near the end, where it says Chrome/131.0.0.0.
This tool reads that string and pulls it apart. It looks for the known browser names in order: Edge (Edg/), Opera (OPR/), Chrome (Chrome/), Firefox (Firefox/), and Safari (Version/ … Safari). The number after the name is the version. The operating system comes from the part in brackets: Windows NT 10.0 means Windows 10 or 11, Mac OS X means a Mac, Android means an Android phone or tablet, and Linux means a Linux computer. The rendering engine follows from the browser: Chrome, Edge, and Opera use Blink, Firefox uses Gecko, and Safari uses WebKit.
The tool also reads facts the browser reports directly, without the user-agent string. Screen resolution comes from screen.width and screen.height, which describe the whole display. Viewport size comes from window.innerWidth and window.innerHeight, which describe the part of the window showing the page — smaller than the screen when the browser is not maximised. Language comes from navigator.language, cookies from navigator.cookieEnabled, and online status from navigator.onLine. JavaScript is on by definition here, because this very page uses JavaScript to run the detection.
Websites use this information to serve the right version of a page: a download button for Windows on a Windows computer, a Mac download on a Mac, or a feature that is only switched on in browsers that support it. Support teams ask for it because many problems only appear in one browser or one version, and knowing the exact version saves a long round of guessing. Your browser sends the user-agent string to every site you visit, so it is not private from websites — but this page never sends or stores it. The detection happens on your device, and the only copy that leaves the page is the one you make yourself with the Copy details button.
Worked example
The readout below is an example — it shows what the tool reports for a typical visitor, not necessarily for you. Imagine opening this page in Google Chrome version 131 on a Windows 11 computer with a 1920 by 1080 screen.
Step 1: The tool reads the user-agent string and finds "Chrome/131.0.0.0", so the browser is Chrome and the version is 131.
Step 2: The brackets say "Windows NT 10.0; Win64; x64", so the operating system is Windows 10 or 11, 64-bit.
Step 3: Chrome uses the Blink rendering engine, and the string mentions AppleWebKit for compatibility.
Step 4: The screen reports 1920 by 1080 pixels, the viewport reports 1920 by 950 with the browser maximised, the language is en-US, cookies are enabled, JavaScript is enabled, and the device is online.
Open the page in your own browser and press Detect again. The tool gives your own readout — for the example visitor it reads "Chrome 131 on Windows 10/11, Blink engine, screen 1920 × 1080" — and the table lists every detail, including the full user-agent string you can paste into a support ticket.
FAQ
What browser am I using right now?
The tool above answers that for you the moment the page loads. It reads your browser's user-agent string and shows the browser name and version, your operating system, the rendering engine, your screen and window size, your language, and whether cookies and JavaScript are on. Press Copy details to save the whole readout as text.
What is a user-agent string?
A user-agent string is a line of text your browser sends to every website you visit. It names the browser and its version, the operating system, and the rendering engine, for example Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36. Websites use it to serve the right version of a page, and support teams use it to work out what a visitor is running.
Is my browser information private?
Your browser sends its user-agent string to every site you visit, so it is not private from websites, but this page does not store or send it anywhere. The detection runs entirely in your browser, and nothing is uploaded or logged. The only copy of the readout is the one you choose to make with the Copy details button.
Why does a website need to know my browser?
Websites use the browser and operating system to decide which features to offer and how to lay out the page. A site may show a download button for Windows on a Windows computer and for Mac on a Mac, or turn on a feature only in browsers that support it. Support teams also ask for browser details because many problems only happen in one browser or one version.
What is the difference between screen resolution and viewport size?
Screen resolution is the size of your whole display in pixels, for example 1920 by 1080. Viewport size is the size of the browser window area that shows the web page, which is smaller when the browser is not full screen or when toolbars and side panels take up space. A page that looks right at one viewport size can look cramped at another, which is why both numbers are shown.