Image requirements
Amazon image validator
Amazon product images need enough detail, a square crop, a clean background, and enough room around the product.
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Main product images are safest as square images at 1000 x 1000 pixels or larger.
Centered products with a clean background are easier to inspect and less likely to feel cropped.
JPG, PNG, and GIF are commonly accepted, but JPG is usually the simplest product-photo choice.