Listing floors are pixels; zoom quality is still the capture
Amazon-style main images often want at least 1600 px on the longest side so zoom works. Shopify themes vary; many look crisp at 2048 on the long side. A 900 px phone snap will pass a “minimum 1000” warning after a 2× Canvas pass and still look soft when a shopper pinch-zooms fabric. Growing pixels helps when you are slightly under a published floor. It hurts when you try to fake a studio capture from a warehouse snapshot. Crop or remove backgrounds first so you are not enlarging seamless paper you will knock out anyway. White-background rules still apply after scale — interpolation can introduce gray fringes; inspect edges. Jewelry and fabric need a real capture; a 2× pass will not weave threads that were one pixel wide. Convert HEIC product shoots first. Progressive 2× plus light sharpen; stop before halos on jewelry. Cap 10,000 px — far above typical PDP needs. Compress per channel after you lock pixels because Amazon and Shopify also enforce megabyte caps. Keep a color-accurate master. This Instant path never uploads SKUs to Convertify4u.