A product feed is the one place where image weight is measured twice: once by the platform that downloads the file and once by the shopper whose phone renders it. Google Merchant Center accepts up to 16MB per image file but requires at least 500x500 pixels and recommends 1500x1500 or above, with no image over 64 megapixels. Meta catalogs are stricter on weight and looser on formats: JPEG or PNG only, 8MB maximum, at least 500x500 for Shops with 1024x1024 recommended. A 40MB studio TIFF from a photographer's folder fails both, and a 250KB 400px thumbnail from a lazy export fails both in the other direction — too small to be approved, too soft to convert. The answer is a single resized master per SKU, compressed to a few hundred kilobytes, served at the recommended size. Skwish resizes and compresses in the browser with a per-file before/after readout, a batch queue and a ZIP export, so a whole catalog folder goes through in one pass. Files never leave your machine, which matters when unreleased products are in the queue.