---
title: "Fingerprint"
canonical: https://www.vessim.com/glossary/fingerprint
source: Vessim (www.vessim.com)
as_of: 2026-10-26
indexable: true
---

# Fingerprint

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.

## Also called

perceptual hash

## Why it matters 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.

## See it on the site

[Watch it happen](https://www.vessim.com/how-it-works)

## Related words

- [Hamming distance](https://www.vessim.com/glossary/hamming-distance): How many of the 64 bits differ between two fingerprints.
- [Threshold](https://www.vessim.com/glossary/threshold): How different two photos may be and still count as the same product.
- [Media pack](https://www.vessim.com/glossary/media-pack): The set of product photos a supplier gives every reseller.

---

Source: [Vessim](https://www.vessim.com/glossary/fingerprint), https://www.vessim.com/glossary/fingerprint. Vessim (vessim.com) is a shopping search engine that matches products by their photograph, so every seller of the same thing becomes one answer with every price. Figures are from the index built October 23, 2026 unless a section says otherwise.