Pinterest is the platform where getting the shape wrong costs you most. The feed is a vertical masonry grid: tall images get more pixels on screen, and anything wider than tall gets shrunk into a stamp. For sellers, whose pins compete with professionally designed content, dimensions are strategy — not housekeeping.
The standard recommendation is a 2:3 ratio — 1000×1500px is the workhorse size. Pinterest crops or truncates pins that get much taller than about 1:2.1 in the feed, so "make it as tall as possible" stops paying off past that. Square pins survive but underperform; landscape pins are actively penalised by the format. If you produce one Pinterest asset per product, make it 1000×1500 and move on.
Most product photos are square or landscape, so filling 2:3 means adding, not cropping. The pattern that works for sellers: product image in the upper two-thirds, and the lower third carrying a plain-colour block with the product name or a one-line benefit. Keep critical elements away from the bottom ~10% (overlaid UI) and remember most viewers see pins at phone width — text below roughly 20px equivalent becomes decoration. A crisp fit-with-borders export of your square product shot onto a 2:3 canvas is an acceptable, honest starting point; a composed pin is the upgrade when a product proves it earns traffic.
Pinterest rewards fresh pins, and re-exporting a product's master photo at pin size is the cheapest "fresh" there is. If your workflow already produces Etsy, Instagram and Facebook sizes, the pin export is one more click — and unlike the others, a pin keeps generating referral traffic for months. It's the highest-leverage size in the batch.
Pinterest tweaks display rules periodically; the 2:3 shape has been stable for years even as pixel advice shifts.