You can upload any jpeg or png image to put on your shirt. We recommend to upload png file types as they have a transparent background.
Make sure you upload LARGE images! To cover the width of a medium t-shirt, an image should be at least 1200 pixels wide. If you are not having to shrink your uploaded image during the design, they are probably too small. Small images might look fine on your screen but they will pixelate when we print them bigger.