Amazon: pure white background (RGB 255, 255, 255), product fills 85 percent of the frame, minimum 1000 pixels on the long side, 2000 for zoom. JPEG preferred.
Shopify: no strict requirements but consistent backgrounds look more professional. 2048 by 2048 pixels recommended for the best zoom experience.
Etsy: clean backgrounds perform better. 2000 pixels on the longest side recommended.
Meesho: white backgrounds improve listing performance. Square thumbnails work best.
Flipkart: white background for most categories. Minimum 500 by 500, 1000 by 1000 preferred.