Find out your exact screen resolution and browser viewport size in one glance. This tool reads the values your browser already exposes and shows your full screen dimensions, the usable viewport of this window, your device pixel ratio, and the color depth of your display. The numbers update live as you resize the window, which is useful when you are testing a responsive layout or need to report your setup for support. Screen resolution is the total pixels your monitor shows, while the viewport is the area the web page actually gets, and the two differ once you account for browser chrome and zoom. Everything is read locally in your browser, so nothing about your device is transmitted anywhere and no permissions are required.