What's My Browser Size? Viewport & Screen Resolution Checker

This tool shows the exact size of your browser's viewport (the area a web page can use), your screen resolution and available screen space, your device pixel ratio and the physical resolution it implies. It also shows orientation, light or dark colour-scheme preference, reduced-motion setting, touch support, browser and operating system.

Designers and developers use it to reproduce layout bugs, to tell a client which breakpoint they're seeing, and to check responsive designs. The Tailwind CSS breakpoint (sm, md, lg, xl, 2xl) updates as you resize, and a scale drawing shows your window inside your screen. It's also a quick way to see how much of your page is visible above the fold on a given laptop.

Everything runs in your browser using standard web APIs, and nothing is sent to our servers. Use Copy all to paste the details into a bug report or support ticket, so whoever fixes the issue can recreate your exact screen, zoom level and browser.