Google launches Resizer to help with responsive design

An interactive viewer to see and test how digital products respond to material design breakpoints across desktop, mobile, and tablet.

Basically Resizer is a website that lets you look at how your responsive design is going to look across multiple screens. It provides instant access to a number of different screen sizes and orientations in a way that is a lot less fussy than resizing browser windows. Give it a try and enter the address of any website to see how the layout responds at different break points.