Compress

Shrink images under a size limit while keeping them as clear as possible. The original format is kept by default, including transparency.

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When to use it

A main or detail image is over the shop or upload size limit.
Thumbnails and list images should stay around 200 KB.
A batch of PNGs is too large, and you still want to keep transparency.

Steps

Upload the images and set a maximum size: 200 KB, 500 KB, 1 MB, 2 MB, or a custom limit from 50 to 10240 KB.
Keep the original format, or convert to JPG.
Download the result. A file already under the limit, with the format unchanged, is copied as-is.

Listing requirements

For most main images, a limit of 500 KB to 1 MB is a practical target. Thumbnails can use 200 KB.
If you keep the format, PNG and WebP transparency stays. PNG size comes down mainly by shrinking the pixel dimensions.
JPG is smaller, but transparency becomes white. Do not use it for artwork you still need to cut out.