Depositphotos publishes a short, specific list. The file format should be JPEG. The file resolution should be a minimum of 3.4 MP, which it writes out as 2400 x 1600. The file size must not exceed 50 MB. Files should not be modified from their original size, and you should not artificially enlarge, distort or stretch the file in order to increase its size or resolution. Read those last two lines together and the compression rule follows: nothing in the requirements asks you to make the file smaller unless it is breaking 50 MB, and the agency explicitly penalises the opposite move — pumping up resolution to look bigger. For illustrations the same 3.4 MP floor applies to the JPEG preview that has to be ZIP-archived with the EPS or AI source. So the correct workflow for a photo that fails the ceiling is: export as JPEG at the native dimensions, step the quality down until the file lands comfortably under 50 MB, and leave the pixel dimensions exactly where the camera put them. A 45 MB submission at 24 MP is fine. A 12 MP submission that was resized down to hit a byte target is a downgrade you did not need to make.