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Duplicate Image Finder

Find duplicates and near-duplicates in a batch of images.

Image Tools Reviews Free · no sign-up

Drop a folder of images here, or click to choose them

Fingerprinted in your browser · nothing is uploaded and nothing on disk is touched

Quick Tool Overview

The Duplicate Image Finder fingerprints every image in a batch perceptually and groups the ones that match, so resized, re-compressed and lightly edited copies are caught — not just byte-identical files. Results are grouped with thumbnails and a similarity percentage, and nothing on your disk is touched.

What it does
Finds duplicate and near-duplicate images
You give it
A folder of images and a sensitivity
You get back
Groups of matches with similarity scores
Best for
Cleaning up photo libraries and asset folders
Image Tools Free, unlimited use No sign-up Runs in your browser

About the Duplicate Image Finder

A photo library accumulates duplicates in two forms: exact copies with different filenames, and near-copies that have been resized, re-compressed or lightly edited. Filename and file size comparison catches the first and misses the second entirely.

Perceptual hashing catches both. Every image is reduced to a 64-bit fingerprint of what it looks like, and any pair whose fingerprints differ by fewer bits than your threshold is flagged as a match. Resized copies, quality variants and re-saved versions all cluster together. Results are grouped with thumbnails and the similarity percentage, so you can see what has been matched before deciding what to delete.

Key features of the Duplicate Image Finder

Catches resized copies

Perceptual hashing matches a thumbnail to its original, which filename or file size comparison never will.

Adjustable sensitivity

Strict for genuine duplicates, loose for burst shots and near-identical frames.

Grouped results

Matches are shown together with thumbnails, sizes and a similarity percentage rather than as a flat list.

Flags the keeper

The largest version in each group is marked, since it is usually the original worth keeping.

Never deletes anything

Nothing is uploaded and nothing on disk is touched — the tool reports, and the deleting is yours.

How to use the Duplicate Image Finder

  1. 1

    Add the images

    Drag a whole folder in. Every file is fingerprinted as it loads.

  2. 2

    Set the sensitivity

    Strict finds near-identical copies; loose finds visually similar shots.

  3. 3

    Review the groups

    Matches are grouped with thumbnails, sizes and a similarity percentage.

  4. 4

    Decide what to keep

    The largest version of each group is flagged, since it is usually the original.

Frequently asked questions

Yes — that is the point of perceptual hashing. A thumbnail and its full-resolution original produce nearly identical fingerprints, which filename or size comparison would never match.

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