About the What Is My Browser & Screen Size
The What Is My Browser tool shows the technical details of your device and browser at a glance. It is useful when a website or app support team asks for your browser version, when you are testing a responsive design, or when you just want to know your screen resolution.
You will see your browser name and version, operating system, screen resolution, current viewport size (which updates as you resize the window), device pixel ratio, color depth, language, time zone, CPU cores, approximate memory, touch support, cookie status and your full user agent string. Click Copy all details to paste everything into a support ticket. All information is read locally and never sent anywhere.
How to use the What Is My Browser & Screen Size
- Open the page; details appear instantly.
- Resize your window to see the viewport size update.
- Click Copy all details to copy everything.
- Paste the details into a support request or bug report.
Frequently asked questions
What is the difference between screen resolution and viewport?
Screen resolution is the size of your whole display. The viewport is the visible area of the web page inside the browser window, which is what responsive designs react to.
Why does my screen resolution look smaller than expected?
Browsers report CSS pixels. On high-density screens (device pixel ratio above 1), multiply by the pixel ratio to get the physical resolution.