Podcast cover art size
Apple requires between 1400 and 3000 square.
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3000 × 3000 square, RGB, under 512 KB. Apple accepts anything from 1400 to 3000 square, and 3000 is the sensible choice since it is used for the large now-playing view.
How to use the podcast cover art size
Podcast artwork is the clearest case of designing for the smallest size rather than the largest. Directories display it at around 55 pixels in a now-playing bar and around 300 in a listing, so the 3000-pixel file exists for one large view almost nobody opens. A show name in small type is illegible at 55 pixels; a bold two- or three-word title or a strong symbol is not. Two technical requirements catch people out: the file must be RGB rather than CMYK, which is easy to get wrong exporting from print software, and Apple rejects artwork with explicit references to platforms other than the one it is submitted to.
Questions
3000 × 3000 square. Apple accepts 1400 to 3000, and larger is better for the now-playing view.