Find identical and resized copies of your photos, grouped, with the best one to keep
Processed in your browser. Nothing is uploaded. Updated on 24 Oct 2026.Choose a folder or drop up to 2,000 photos and the page finds byte-identical copies by SHA-256 and resized or recompressed copies by comparing the pictures. Each group shows thumbnails with the largest copy marked to keep. Download the list as CSV, or a ZIP without the duplicates. Nothing is deleted or uploaded.
Press Choose a photo folder, or drop up to 2,000 photos on the page; they are read in your browser and nothing is uploaded.
Leave Also find resized and recompressed copies on to catch smaller or lower-quality versions, not only identical files.
Look through each group: the copy suggested to keep is marked Keep, and tapping a photo switches it between Keep and Remove.
Press List (CSV) for the file names, or Download photos without duplicates (ZIP); no file is deleted.
A photo library collects copies without anyone meaning to: the same picture from a phone backup and from WhatsApp, a camera card copied twice, an album exported at a smaller size. This page finds them and tells you which copy is worth keeping.
Two kinds of duplicate. Files with exactly the same bytes are found by their SHA-256 fingerprint, which never mistakes two different files for one. Copies that were resized, recompressed or saved in another format share no bytes, so each picture is also shrunk to a small grey grid and turned into a 128-bit difference hash. Two photos count as similar when only a few of those 128 bits differ; a halved copy of a photo usually differs in 0 to 4.
The slider. Strict matches only resized and recompressed copies. Normal, the default, also catches light edits. Loose may group different shots of the same scene, so check those groups before acting on them. Photos of a different shape (a square crop of a wide photo) are never grouped.
Which one to keep. In each group the copy with the most pixels is marked Keep, then the larger file, then the one higher in the folder tree and with the plainer name. Tap any thumbnail to switch it between Keep and Remove.
What you take away. A CSV list of every group, a ZIP of the whole set without the duplicates, or a ZIP of just the copies marked Remove. The page never deletes, moves or renames a file: clean up the folder yourself with the list beside you.
What it does not do. A crop, a rotation or a mirror image is a different picture to the hash. RAW files and damaged images that the browser cannot open are checked for identical copies only. Photos are read in small batches with a progress line and a Stop button, so hundreds of files do not freeze the page, and none of them leave your device.
Press Choose a folder, or drop the folder or the photos on the page. Every photo is read on your device, subfolders included, and the duplicates appear in groups with thumbnails and the best copy marked Keep. Up to 2,000 photos are read in one go.
Yes. Besides identical files, each picture gets a 128-bit difference hash from a small grey version of itself. A copy saved at half the size or a lower JPEG quality usually differs in 0 to 4 of those bits, well inside the default limit of 12.
No. Nothing is deleted, moved or renamed. Download the CSV list to see which files to remove, or download a ZIP of the set without the duplicates and use that instead of the old folder. Deleting the originals is left to you.
The copy with the most pixels, then the larger file, which usually means less compression, then the one higher in the folder tree with the plainer name, so IMG_1.jpg wins over IMG_1 (1).jpg. Tap any thumbnail to switch it between Keep and Remove.
At the Loose end of the slider, shots of the same scene taken a moment apart can look alike to the hash. Move the slider towards Strict and the groups rebuild at once. Each photo shows how many of its 128 bits differ from the one kept.
No. The photos are read, fingerprinted and shrunk to thumbnails inside your browser, and the ZIP is built there too. Nothing is sent to a server, and closing the tab leaves no copy of any photo behind.
Still stuck? Ask about Duplicate Image Finder and anybody who knows can answer. No account needed.
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Also works as: Find Duplicate Photos.