Marketplace tiles are a fill-percentage problem
Amazon’s main image is picky: product on a white background, filling most of the frame (sellers often aim for 85%+ of the area), no badges, no watermarks, no inset lifestyle scenes on that first slot. Extra images can be infographics and lifestyle; the main slot cannot. Recommended long edge is often 1600 px or more so zoom works. This page helps you place the object with even padding after the background is already clean. Shopify theme grids are frequently square or a consistent portrait; a mix of 4:3 and 16:9 in one collection looks like a junk drawer. eBay search tiles shrink aggressively — the item must read at a glance. Etsy buyers tolerate lifestyle, but the first photo still needs an obvious object. None of these rules are identical, which is why a single “amazon crop” dumped onto Etsy can feel sterile, and an Etsy lifestyle dump can fail Amazon. Workflow: shoot or isolate the subject (Background Remover when a white sweep was not in camera), frame with consistent margins across colourways, export, then resize to each channel’s pixel floor. HEIC from a phone shoot should become JPG before Canvas. Do not add text in the crop step; that belongs in a design tool and may violate main-image policy. Convertify4u does not list the SKU for you — it only prepares the still so the marketplace zoom and the theme grid stop fighting your photography.