To get started, here are some general rules of thumb to keep in mind when thinking about print files when uploading your own design:
Max. printing area: 12×16 inches and we scale print files down depending on the t-shirt model and size.
DPI: Files have to be a minimum of 150 dpi (digital pixels per inch) to ensure optimal quality. Any lower and the print will be blurry and pixelated.
Do submit these file formats: .png, .psd
Don’t submit these file formats: .ai, .pdf, .eps
Another super important thing to keep in mind is the design itself – make sure that your design corresponds to Printage’s Acceptable Content Guidelines. Remember that content that is hateful, illegal, and that violates intellectual property rights may be reviewed and removed at any time.