Screen Sizes is a measurement and dimensioning tool for websites. It shows you the size of the screen of the device on which the website is displayed.

There is a built-in screen viewer that allows you to quickly find and see the exact size of the window. 

This is a tool that allows you to measure the height and width of all of the elements on the screen. You can measure the size of any element in the page. This means that you can see the size of all of the images, inputs, buttons, videos, and icons in the browser.

This tool is very easy to use and will help you discover what dimension you should be using when designing a website.