Preferred File Format: PDF.Accepted File Formats: DOC, JPEG, JPG, PNG, TIFF, AI, PSD, PUB, PPT.Resolution: 300 DPI.Color Space: We prefer CMYK (Cyan/Magenta/Yellow/blacK). If you use RGB, the colors on the print may turn out, in some cases, different than what you're expecting.Fonts: Please flatten your documents before sending your file. If you use a special font which our system can not recognize, the document will replace your font with another font in our system.