How to use the checker
- Pick the marketplace you're listing on — Amazon, eBay, or Etsy. The rules and thresholds change with the choice, and the spec line under the dropdown shows exactly which ones apply.
- Drop in one photo or a whole batch (up to 20 JPG, PNG, or WEBP files). Nothing uploads; the files are read straight off your disk into the page.
- Read the report card for each image. Every rule gets a pass, warning, or fail, with the measured value next to it.
- Apply a one-click fix where one is offered, re-check, and download the corrected file — individually or as a
.zipfor the batch.
What the report actually shows you
Take a common case: an Amazon main image shot in a lightbox. To your eye the background is white. The report card comes back with:
- Background colour — FAIL. Measured
249, 250, 248at the border. Amazon wants255, 255, 255. Because every channel is above 244, it's flagged as snappable — the "Snap background to white" button will push it to pure white without touching the product. - Dimensions — PASS. 2000 × 2000px, comfortably over the 1000px zoom threshold and the 1600px comfort mark.
- Frame fill — WARN. Product occupies about 71% of the frame; Amazon's guideline is 85%. Crop tighter, then re-check you didn't drop below the size minimum.
- Edge shadow / stray text — ESTIMATE. Shown with a badge. These are heuristics, so the tool says "worth a look" rather than pass or fail. Zoom in and confirm by eye.
One snap, one crop, one re-check, and the same photo comes back all-green — before it ever reaches Seller Central. The full method behind each measurement is in how ListingLint checks your photos.
When it helps most
- Before a first upload, so a launch isn't held up by a silent rejection you can't see.
- After an unexplained rejection, to find the measurable cause fast — work the diagnostic checklist alongside it.
- Before a bulk / flat-file upload, to catch the photo that will fail across 50 SKUs at once.
- When cross-listing, to see whether one hero shot can serve Amazon, eBay, and Etsy or needs a white-background version for Amazon only.
How it compares to the alternatives
- Uploading and waiting for the marketplace to tell you. The slowest loop, and the rejection message is often vague ("image does not meet requirements"). ListingLint gives you the specific value now.
- The eyedropper in Photoshop or GIMP. Accurate for background colour if you know to check the exact corner pixels, but it won't measure frame fill, won't judge zoom eligibility, and there's no batch mode or one-click fix.
- Paid listing-audit or repricer suites. Some include image checks, bundled into a subscription aimed at larger sellers. ListingLint does the image part only, free, with nothing to install and nothing uploaded.
- Background-removal web apps. Great when you genuinely need to cut the product out, but they upload your image and they don't tell you whether you needed to. Check first; only reshoot or cut out if the background is truly coloured.