Direct answer: Each marketplace enforces different minimum and maximum pixel dimensions, file-size caps, and aspect-ratio rules. Getting these right before upload avoids rejection loops and keeps your listings live on the first attempt.
Sellers who upload the same image to five platforms often discover that each one has its own size rules. Amazon wants a main image of at least 1600 px on the longest side for zoom, Shopify prefers square 1:1 crops for grid consistency, Etsy recommends 2000×1500 for a 4:3 ratio that fills the listing card, and eBay gallery images cap at 1600×1600. Upload a 4000 px original to all five and you waste bandwidth; upload a 800 px square and Amazon zoom breaks.
The fix is to prepare a master export at 2048 px on the longest side in sRGB, then resize per platform before upload. PicTools batch resize handles this in one pass: pick the platform preset, choose fit or fill-crop, and export a ZIP per marketplace. The whole batch finishes in under a minute for 50 images.
Keep your master files at the highest resolution you can, and treat the platform-specific export as a final pass. That way the next seasonal update starts from one source of truth instead of five different exports.
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