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Dedupify

Find and remove duplicate photos on your computer.

Dedupify app screenshot

How it works

Pick a folder

Choose any directory on your machine to scan.

Find duplicates

Images are embedded via CNN and matched by cosine similarity.

Review & clean up

See grouped results, keep the best, move the rest to Trash.

Under the hood

Each photo is run through a small CNN (MobileNetV3) locally on your machine to produce a feature embedding — a vector that captures the visual content of an image.

These vectors are L2-normalized and indexed with FAISS (Facebook AI Similarity Search). Cosine similarity between any two vectors determines how alike they are. Pairs above a threshold are grouped as duplicates using Union-Find.

ONNX Runtime·MobileNetV3·FAISS·Cosine Similarity·Union-Find

Features

Sensitivity control

Tune matching strictness — from near-exact copies to visually similar photos.

Quality ranking

Surfaces the best version per group by resolution, sharpness, and metadata.

Autocrop

Strips borders and whitespace before comparing so padded images still match.

Safe by default

Deletions go to Trash. Nothing is permanently removed.

Fully local

Runs entirely on your machine. No cloud, no uploads, no internet required.

HEIC support

iPhone photos just work — HEIC, JPEG, PNG, WebP, and more.