StockX buyers shop on a grid of near-identical pairs, comparing colourways and condition at thumbnail speed, so the listing whose photos paint first is the one that earns the tap. Sellers shoot every angle — lateral, medial, heel, box label, tag — and camera-original files turn that five-photo set into a heavy page for buyers on mobile data. Skwish compresses images locally in your browser with a live before/after size readout per file, so stitching, texture, and the box label stay sharp while each file drops to a fraction of its size. Compress the whole set in one batch and export a ZIP. Nothing leaves your device.