Platform Image Specs

Every platform re-processes what you upload. Marketplaces reject listings whose main image breaks their background rules, social networks crop thumbnails to their own aspect ratios, and almost everyone re-compresses your file — so an image that looked crisp on your screen can arrive blurry, cropped, or bounced entirely. Knowing the target platform’s requirements before you export is the difference between uploading once and uploading four times.

Each page below collects one platform’s official image specifications in a single place: minimum and recommended pixel dimensions, accepted file formats, file-size ceilings, aspect ratios for each placement, and — where the platform enforces them — background and content rules like Amazon’s pure-white main image requirement. The numbers come from each platform’s own published guidelines, so you can use them as a pre-flight checklist rather than guessing from forum posts.

The specs are also built to be acted on with the tools on this site. Hit an exact pixel target with the image resizer, convert to an accepted format with the format converter, get under a size ceiling with the image compressor, and produce the clean white or transparent backdrop marketplaces demand with the background remover. For the reasoning behind quality-versus-size trade-offs, the file size guide covers how to choose. Platforms revise these rules from time to time, so each spec sheet notes when it was last verified — and when in doubt, the platform’s own documentation is the final word.