Supported file types: PNG, TIF, PSD, GIF, JPEG. Our recommended format is transparent PNG file in CMYK color profile. Files that are provided as RGB are automatically converted to CMYK and may result in some color shifting. Files MUST have a transparent background. For example providing an image with a black background will have the black printed on the t-shirt that will be visible which isn’t always ideal in t-shirt designs. Please understand that designs on a screen are different than prints on fabric.