How does the Responsive Checker work? Simply enter your website’s URL into the Responsive Checker, and the tool will take care of the rest. What is a Responsive Checker tool? This Responsive Checker tool lets you preview your site on different devices, including popular mobile and tablet devices, as well as custom resolutions. A mobile responsive site will look good across all devices and resolutions. Even screens that appear to be the same size can have different resolutions, and it is the screen resolution (rather than the physical screen size) that mobile responsive websites must adjust to.įor example, iPads may be the same physical size but can have slightly different screen resolutions depending on each generation and whether the device has a ‘retina’ screen. What is mobile Responsiveness? A mobile responsive website is designed to automatically adjust to fit different mobile, tablet, and desktop devices.