Pet photos are a harder compression target than most. Fur is high-frequency detail, so a blunt quality slider turns a sharp coat into a smear faster than it degrades a flat wall or a product shot. That matters because the destinations all have caps: Adopt-a-Pet recommends 2MB and calls 100k plenty, Petfinder wants at least 570 pixels wide under a 25MB ceiling, Rover's profile square is about 400x400, and insurance claim portals routinely bounce multi-megabyte phone photos. The order of operations is what saves quality — resize down to the pixels the destination renders, then compress, never the reverse, and never compress an already-compressed copy. Skwish does both in the browser with a live per-file before/after readout, so you can find the quality point where a 4000px photo lands at 200KB and still has visible whiskers. Batch the folder, export a ZIP, and the originals on your disk stay untouched.