Zen Image Optimizer

Zen Image Optimizer compresses and resizes the images already in your store. Each image is rewritten in place: the media ID and the CDN URL stay the same, so themes, links and indexed pages keep working without redirects.Before a bulk run you can preview the result on a sample of your own photos — measured in memory, with nothing uploaded. Originals are stored for 30 days and any run can be restored, one image or all of them.