How to find and delete duplicate photos on iPhone

Duplicates are the best photos to delete, because deleting one costs you nothing. You still have the photo. You just stop having it twice.

There are two problems worth separating, and most advice online conflates them:

• Exact duplicates — the same image saved twice.
• Near-duplicates — eleven shots of the same moment, seconds apart, all slightly different.

iOS handles the first. It does not handle the second at all.

Method 1: the built-in Duplicates album

Since iOS 16, the Photos app finds exact and near-exact duplicates for you.

1. Open Photos.
2. Go to the Albums tab.
3. Scroll to the bottom, to Utilities.
4. Tap Duplicates.

You'll see pairs or groups, with a Merge button on each. Merging keeps the highest quality version and combines the metadata — favourites, keywords, captions — then moves the rest to Recently Deleted. There's a Select button at the top right if you want to merge several groups at once.

Things that trip people up

The album isn't there. Two common reasons. Either your iPhone hasn't finished analysing your library yet — it only does this while the phone is locked, charging and on Wi-Fi, which on a large library can take several days — or it genuinely found no duplicates. Plug the phone in overnight and check again.

It finds almost nothing. This is normal, and it's the real limitation. The matching is conservative by design: Apple would rather miss duplicates than merge two photos you thought were different. A library with thousands of near-identical shots can show a Duplicates album with a couple of dozen entries in it.

Merging doesn't free space immediately. Merged photos go to Recently Deleted, where they stay for 30 days. To get the space back now, go to Albums → Recently Deleted and delete them permanently.

iCloud is synced. If iCloud Photos is on, merging on one device merges everywhere. That's usually what you want, but it means there's no "just on this phone" option.

Method 2: the near-duplicates nobody's finding

This is where the actual gigabytes are.

Think about how you take photos. Someone's face is half-turned, so you take another. The dog moves, so you take three more. You hold the shutter for a burst. You end up with a cluster of eight images of one moment, seven of which you will never look at, and none of which is a "duplicate" in any strict sense.

Apple's Duplicates album won't offer these to you, because they're not the same photo. But they're the single largest category of deletable material in a normal camera roll.

Doing it by hand

You can. Open Photos, scroll to a date you remember taking a lot of shots, and work through it. Tap Select, tap the ones you don't want, tap the bin.

Two things make this harder than it sounds. First, the grid view is too small to tell which of five near-identical shots is actually sharp — you have to open each one. Second, there's no progress: you clean up one afternoon in 2023 and the library looks exactly as full as it did before.

Most people do this once and never again.

What a tool should do

The useful version of this is a tool that groups the cluster for you, shows the photos big enough to judge, and gives you a one-gesture decision per photo. That's the whole design problem — not finding the photos, but making the decisions cheap.

How duplicate detection actually works

Worth understanding, because it tells you which tools to trust.

A naive cleaner compares file size and date. That's fast and almost useless: it misses the same photo saved at a different quality, and it produces false matches between unrelated photos that happen to be a similar size.

A good one computes a perceptual hash — a short fingerprint derived from the image's actual visual structure, usually by shrinking it right down, converting to greyscale, and recording the pattern of light and dark. Two versions of the same photo produce nearly the same fingerprint even if one is a JPEG at 2 MB and the other a HEIC at 800 KB.

Then it compares fingerprints and measures how many bits differ. A difference of nearly zero means it's the same image. A slightly larger difference means it's the same scene a moment later — which is exactly how you separate "duplicate" from "similar" instead of guessing.

If a cleaner can tell those two piles apart, it's doing real image analysis. If it only ever shows you exact copies, it isn't.

Before you delete anything

• Check Recently Deleted afterwards. Nothing is really gone until you empty it, and nothing is really freed either.
• If you use iCloud Photos, deleting is everywhere. That's the point of sync, but be deliberate about it.
• Beware anything that wants to upload your library. There is no technical reason a duplicate finder needs to send your photos to a server — the fingerprinting runs fine on a phone. If it asks to upload, ask why.

The short version

Use the built-in Albums → Utilities → Duplicates for exact copies. It's free, it's safe, and it takes two minutes. Then empty Recently Deleted so the space actually comes back.

For the near-duplicates — the bursts, the retakes, the eleven photos of one moment — you need something that groups them and makes each decision a single gesture. SwipeDrop keeps Duplicates and Similar as separate piles for that reason, shows each photo full-size, and lets you swipe left to drop or right to keep. Nothing is deleted until you've reviewed the batch and confirmed it, and none of it leaves your phone.