Glossary · Amazon
Zoom threshold (1,000 px)
The zoom threshold is the image size at which a marketplace lets shoppers magnify a product photo; on Amazon, images 1,000 px or larger on the longest side enable zoom.
Zoom is the hover or pinch magnification on a product page, and for many shoppers it stands in for picking the item up. Platforms only offer it when an image has enough pixels to show detail.
Amazon's product image requirements set the longest side between 500 and 10,000 px and say that 1,000 px or more enables zoom. Walmart's guidelines recommend 2,200 x 2,200 px and set 1,500 x 1,500 as the minimum for zoom. Etsy recommends at least 2,000 px in width and height. Shopify says 2,048 x 2,048 "usually displays best" for square images and accepts up to 5,000 x 5,000 px or 25 megapixels.
The common mistake is upscaling a small image to cross the threshold. The platform then offers zoom, but the magnified view is blurry, which looks worse than no zoom at all; Walmart's guidelines say not to upscale. A second mistake is meeting the pixel count while leaving the product small in the frame, so zoom mostly magnifies white space. The 85% frame fill rule on Amazon helps here.
File size limits sit alongside pixel limits: Walmart's maximum is 5 MB, Shopify's is 20 MB, and Etsy warns that files over 1 MB may fail to upload. Save at high quality, then check the file size per platform.
PicBarn's per-platform exports are sized for each marketplace, but zoom detail still depends on the resolution of the photo you start with.
See also
- 85% frame fill85% frame fill is Amazon's main-image rule that the product should take up 85% of the image frame, so it reads clearly as a thumbnail while still being shown whole.
- DPI vs pixelsDPI is a print setting that says how densely dots are placed on paper, while pixel dimensions are the actual size of a digital image; marketplaces judge product photos by pixels, not DPI.
- Aspect ratioAspect ratio is the proportion of an image's width to its height, written as 1:1 for square or 4:5 for portrait, and it decides how a photo is cropped in grids and thumbnails.
Related
- Amazon image requirements checkerFree: upload an image, see which marketplace rules it passes.
- Shopify product image sizes and how to export every one from a single photoShopify’s official limits (5,000 × 5,000 px, 25 MP, 20 MB), the 2,048 × 2,048 size that displays best, how the CDN serves every other size from one master, and how to get the Amazon, TikTok Shop and Etsy sizes from the same photo.