Fingerprint
also: perceptual hash
A photo, shrunk to 64 bits that stay the same when the photo is resized or recompressed. The photo is reduced to a tiny greyscale picture and turned into 64 ones and zeros that describe its shape of light and dark. As of October 23, 2026, Vessim has fingerprinted 387 listings and compared 74,691 photo pairs.
33b6 6f5b 2204 91f233b6 6f5b 2204 91f2Merged: “12.5 M Durable Flagpole Halyard Rope Flags Pole Rope Nylon Braided Cord White”
6337 9cd8 9262 26e6629f 98b0 a662 e6a6Kept apart, same title: “Magnetic Phone Case Stand Drop-proof”
At Vessim.
Two copies of the same photo give the same, or nearly the same, fingerprint, even after a store resizes it. It is how Vessim recognises one product across sellers whose titles disagree. Resellers reuse the supplier's photos, so the fingerprint follows the product from shop to shop.
Watch it happenWhere fingerprint shows up on the site.Now say it your own way.
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