Free tool

Duplicate photo finder

Drop in a folder of photos and see which ones are copies of each other. Free, private, and nothing leaves your device.

Drop your photos here

Up to 500 at a time, from any folder. Nothing is uploaded: the comparison runs inside your browser.

Your photos never leave your device. No upload, no server, no account.

How it finds duplicates that file names miss

Most duplicate finders compare file names or the exact bytes of each file. That catches a photo copied twice into the same folder, and misses almost everything else: the same picture sent over WhatsApp comes back smaller and recompressed, a download from a shared album has a new name, and an edited copy has different bytes. None of those look like duplicates to a byte-for-byte check.

This finder compares what the photos look like instead. Each one is shrunk to a tiny grey thumbnail and turned into a perceptual fingerprint: the broad shape of its light and dark areas. Copies of one picture keep nearly the same fingerprint through resizing and recompression, while different pictures end up far apart. Switch to "Also similar shots" and it also groups photos of the same moment taken within a few minutes of each other, such as a burst of five frames of the same toast.

Why your photos are never uploaded

Online duplicate finders usually ask you to upload your library to their server. For personal photos — faces, children, home addresses in the background, GPS coordinates in the metadata — that is a lot to hand over to a website you found a minute ago.

Here, the decoding, fingerprinting and comparison all happen in your browser. Your photos are read from your disk into memory, compared, and nothing is transmitted: you can disconnect from the internet once the page has loaded and it keeps working. That is also why there is no account, no queue and no limit on how many times you use it.

Cleaning up the photos from an event

Duplicates pile up fastest after a wedding or a party. Several guests share the same group photo, someone forwards a whole album through a messaging app, and everybody shoots bursts of the cake and the first dance. A few hundred photos can easily hide a hundred copies.

This tool helps with a folder you already have. If you are collecting photos from guests, EventUploader does it for you: guests upload originals through one QR code, and its Similar photos tool groups the duplicates and bursts of your event automatically, with AI marking the best shot of each so you can clear the rest in a few taps.

Common questions

Are my photos uploaded anywhere?

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No. Everything runs inside your browser: the photos are read from your device, compared in memory, and never sent to our servers or anyone else's. You can check by disconnecting from the internet after the page loads; the finder keeps working.

Does it delete the duplicates for me?

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A web page is not allowed to delete files on your computer or phone, so it shows you the copies instead. Select the ones you don't want, then download the list of their file names to delete them yourself, or download every other photo as a ZIP and use that as your cleaned-up folder.

What is the difference between duplicates and similar shots?

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Exact duplicates are the same picture, even if one copy was resized, recompressed or renamed. Similar shots are different pictures of the same moment, taken within about three minutes of each other, like a burst or a retake. Start with exact duplicates: those are always safe to remove.

How does it choose which copy to keep?

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In each group, the photo with the most pixels comes first, then the biggest file, then the oldest. That is usually the original rather than a copy a messaging app shrank. It is only a suggestion: you choose what to select.

How many photos can I check at once?

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Up to 500 per batch, and you can add more photos to the same batch until you reach that. Large photos take a moment each to read, so a full batch can take a minute or two on a phone.

Does it work with iPhone HEIC photos?

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In Safari, yes: it reads HEIC directly. Chrome, Firefox and Edge can't decode HEIC, so those files are skipped; convert them first with our free HEIC to JPG converter, which also runs in the browser.

Let duplicates sort themselves at your next event

EventUploader collects every guest's photos and videos through one branded QR-code page, in original quality, then groups the duplicates and bursts for you, with AI pointing out the best shot of each.

500MB free • No credit card required

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