ABOUT THIS TOOL
This tool allows you to see whether your website design is responsive. Enter the mail website URL and you will be able to see how responsive your website design is.
WHY MOBILE RESPONSIVE?
Websites are accessed more and more across different devices. Designing your website to be mobile friendly and responsive on all devices ensures it performs well.
GOOGLE MOBILE FRIENDLY TEST
https://search.google.com/test/mobile-friendly is another tool that will allow you to carry out a mobile friendly test.