Serves different images based on the device being used by the viewer, all you have to do is create a high-res version of each image. And we create the necessary css to view them.
We integrated auto-alignment. All your images get aligned automatically, saving as much space as possible. Simply magic!
With retina displays comes bigger filesize. Keep them reduced to the same as the 1x size with the new image-webp format
Decide the default background color and have another color for the unused dead space
If you want to add the same padding/margin around all images you can do that indivudual to all images
Add a sprite by draggin in your image to the sprite.