Amazon, eBay and Shopify each publish their own product-image rules - minimum and recommended pixel dimensions, accepted formats, file size caps, and (for Amazon specifically) background and framing requirements for the main image. Getting one of these wrong after a listing is live usually means a rejected upload or a flagged listing, not a helpful error message telling you what to fix.

When you'd use this

Before uploading a batch of product photos to a new marketplace, especially when the same image set needs to satisfy more than one platform's requirements at once - this checks all three simultaneously so you're not testing them one at a time.

It also catches a subtler problem: an image whose actual pixel content doesn't match its file extension (a PNG saved with a .jpg extension, for instance), which some upload pipelines silently reject or mis-handle.

Common errors

A "fail" on Dimensions or Format is a hard technical check - the pixel size, aspect ratio, or actual file format genuinely doesn't meet that marketplace's stated minimum or accepted list.

Background whiteness and subject-fill are shown as "estimate" or "warn", never as a plain pass or fail. They're rough pixel-sampling heuristics, not real computer vision - treat a poor estimate as a prompt to look at the image yourself, not as a verdict.

Frequently asked questions