How to delete similar photos on iPhone (what the Duplicates album misses)

Everyone with a full phone has been told to check the Duplicates album. Most people check it, find forty photos, delete them, save 90 MB and conclude that the advice was useless.

The advice was not useless. It was answering a different question.

Two different problems

Exact duplicates are the same image on your phone twice — a photo someone AirDropped back to you, a picture saved twice from Messages, an export that landed next to its original. iOS finds these.

Near-duplicates are eleven shots of one moment. The dog moved. Someone blinked. You held the shutter. You now have eight images, seven of which you will never look at, and none of which is a duplicate of any other in any strict sense.

Near-duplicates are where the gigabytes are. In a normal camera roll they outnumber true duplicates by something like twenty to one — and Apple's Duplicates album will not offer you a single one of them.

Method 1: by hand, by date

Free, and effective if you know where your worst days are. The trick is to work by occasion rather than scrolling the whole library.

1. Find a day you shot a lot

   In Photos, use the Years / Months / Days views, or search for a place or a person. A wedding, a holiday, a birthday, a day at the beach — that is where the clusters are.

2. Open the day, then tap Select

   The Days view already groups by moment, which is most of the work done for you.

3. Pick the keeper, not the rejects

   Decide which one shot from each cluster you want, then select everything else. Choosing one to keep is a much faster decision than judging seven photos individually.

4. Delete the batch, and move to the next day

   Do not try to do the whole library. Do three days. It is the difference between finishing something and abandoning it.

Two things make this harder than it should be. The grid thumbnails are too small to tell which of five near-identical shots is actually the sharp one, so you end up opening each — and there is no sense of progress, because clearing one afternoon in 2023 leaves the library looking exactly as full as before.

Most people do this once and never again.

Method 2: let something group them for you

The useful version of this job is a tool that does three things: groups the cluster, shows each photo big enough to judge, and makes the decision one gesture. That is the whole design problem — not finding the photos, but making the decisions cheap enough that you get through thousands of them.

Any of the swipe-based cleaners do this, and they differ mostly in their free tiers rather than their detection. There is a straight comparison in the best iPhone photo cleaner apps.

Ours works this way: a Similar pile that is separate from the Duplicates pile, grouped by fingerprint similarity, dealt one card at a time. Swiping left queues rather than deletes, and the queue goes to a review screen before anything is removed — which matters more here than anywhere else, because near-duplicates are exactly the category where you might change your mind about which take was the good one.

What to keep, and what to drop

A few rules that make the decisions faster:

• Keep the sharp one, not the first one. In a burst, the first frame is usually the one with the camera still settling.
• Drop everything where the subject is mid-blink or mid-word. You will never use it and you know it now.
• Keep one wide and one close, not six of each. Two survivors from a cluster is a perfectly good outcome; you do not have to get to one.
• When two are genuinely equal, keep either and move on. The five seconds you spend comparing them, times four thousand, is why the last cleanup never finished.

Then actually free the space

Nothing above has recovered a single byte yet. Deleted photos sit in Albums → Recently Deleted for 30 days, taking exactly as much room as before.

Go there, tap Select → Delete All, and confirm. That is the step where the storage number finally moves — and if it still does not, here is why.