RoundPic is a free web service that makes it easy to convert an image with square corners, to an image with nice smooth round corners. It’s possible to make rounded corners Photoshop, but RoundPic makes it dead simple and fast. This is great when you want a modern, web 2.0, look and feel for your logo or avatar, or when your client does. It also works great for making buttons.
Take a look at the before and after.
Of course, the difference is extremely subtle, but we believe that the little details, when you add them all up, make a big difference.