TIFF File Format Above all else, our number one preferred format is TIFF, or Tagged Image File Format. Designs saved as TIFFs at the appropriate resolution (300 dpi or higher) work perfectly for our full-color process printing, and we strongly suggest you find a way to "Export", or "Save As" in TIFF format. A number of programs allow you to save as TIFFs: 1 . Photoshop 2 . Illustrator (or EPS files opened in Illustrator) 3 . CorelDraw