Image below minimum 500px on longest side

eBay requires every listing photo to be at least 500 pixels on the longest side. Error 21919137 fires when a smaller image is submitted, and the listing is blocked.

The CDN is serving a thumbnail variant, the source photography genuinely is below resolution, or the feed pipeline downscales images during transformation. eBay raised the minimum from 200px to 500px in 2014 and enforces it strictly today.

1. Check every image URL and confirm dimensions are at least 500px on the longest side.
2. Switch CDN URLs from /thumbnail/ to /full/ or remove sizing query parameters.
3. Re-shoot or re-source any product whose original image is under 500px.
4. Use 1600px on the longest side for best zoom performance on eBay's product pages.
5. Resubmit once images meet the minimum.

• Shopify ?width=400 URLs in feeds that should use the master image
• Borders or padding adding pixels visually but not resolution-wise