Screenshot of Creative Librarian using Am I Responsive.
Stop resizing that browser, you’re gonna wear it out! How many times have you heard that one? Well okay, maybe not so many times, but if you develop responsive design web sites, you know what I’m talking about: with every DOM or CSS edit you’re dragging that browser edge back and forth, testing your changes and looking for anything broken.
Ultimately, most of this effort is an attempt to emulate the screen size of different devices.
So what is a developer to do? Thankfully, there is a growing number of browser-based tools available that emulate the screen sizes of a wide variety of devices. Different tools come with different feature sets and varying levels of utility, of course. We’ll look at several of them here.
A very useful list of services for fast side-by-side comparisons at different sizes. Am I Responsive is particularly nice in that it works with localhost so you can use it on projects still in development.