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.

• Catalogue scan — reads size of every product and Files library image, resumable,
• Savings estimate — shows what is optimizable and how much before anything runs
• Preview run — compresses 5 of your own images in memory to measure the real
• Bulk compression — JPEG, PNG and WebP with lossless, balanced or aggressive
• Usage tracking — per-cycle counter of what was optimized, with skipped images