Challenge submissions must be JPEGs or GIFs, saved for web. The file must be under 200KB and the larger side must be set at 550px. Download a submission kit for the challenge you'd like to enter (found at www.minted.com/contest) more details.
If your design is selected as a winner, you will need to turn in final files in Illustrator for stationery and as a high-resolution JPEG for art prints. We can not accept final files in Photoshop.