The book’s cover art that appears on Apple Books, also known as the marketing image, is the image delivered alongside the book asset. It does not refer to the interior cover image included in the book asset. The pixel limit for the interior cover, as with all interior book images, is 5.6 million pixels.
The book’s cover art must use RGB color mode and should be at least 1400 pixels along the shorter axis. For best results, a good rule of thumb is to use an image that is a minimum of 300 dpi.
The book’s cover art file must be a high-quality JPEG with .jpg or .jpeg extension or PNG with .png extension.
The 5.6 million pixel limit on interior book images does not apply to the external cover/marketing image that is sent alongside the book asset.
Important: Do not increase the size of a smaller image to meet the minimum image size dimension standard. Excessively blurry or pixelated images are rejected.