Adopt-a-Pet's own shelter guidance is unusually blunt: use the lowest resolution your camera offers, because the site only shows low-resolution images and a smaller file uploads much faster. Their stated max recommended photo size is 2MB, with 100k called out as usually plenty big. That is a fraction of what a phone produces, and it is the whole reason shelter uploads crawl when staff post dozens of animals in a sitting. Their photo advice also shapes the crop: the first photo should run from the head down to the lower shoulders or chest with the pet filling most of the frame, in natural light, ideally on grass or plain fabric, with up to four photos per listing. Compressing to roughly 100-300KB keeps that framing intact while making the upload instant. Skwish runs in the browser with a before/after readout per file and a batch queue, so an intake folder is one pass and one ZIP. The photos stay on your device.