Etsy listing image size

2000 × 2000 square, under 20 MB. The important part is that your first image is cropped to 4:3 for the search thumbnail, so the top and bottom of a square are cut off where it matters most.

That crop is what decides whether anyone clicks. Etsy search shows a 4:3 landscape thumbnail cut from your square first image, taking roughly the middle — so a product photographed to fill a square vertically gets its top and bottom removed in the one place shoppers are choosing between listings. Compose the first image so the product reads within the central landscape band, and use the remaining nine slots for the vertical framing, detail and scale shots. Etsy allows ten images and video, and listings that use most of the slots convert better simply because there is less left to wonder about.