Ever wonder why your Facebook profile or cover images look grainy? Do you notice distortion around text in your images? It’s because Facebook further compresses JPG files and it makes your images look nasty. The easy solution is to upload PNG format for your images and they will look much better. In the image above, notice how clean and crisp the right side is compared to the left side? The right side was a PNG and left side was a JPG image uploaded to Facebook.
This is a simple habit to get into that will keep your images looking nice and clean on Facebook, possibly other sites as well.