how to find and delete duplicate photos, without losing the good ones.

if you've been bringing photos home from old phones, hard drives and apps, you'll have copies. that's not a mistake, it's how gathering works. the same picture was backed up to the cloud, copied to a laptop, saved to a drive and downloaded again years later.

cleaning them up is worth doing, but it's also the one step in sorting photos where a hurried click can cost you something real. so the aim here isn't to delete as much as possible. it's to end up with one good copy of every moment, and to be sure of it.

what counts as a duplicate

not every pair of similar pictures is a duplicate. it helps to tell three kinds apart before you start.

• exact copies. the same file, byte for byte, in two places. these are always safe to reduce to one.
• the same photo in different versions. a full-size original and a smaller copy from a messaging app or an old web album. they look the same on screen, but the original holds more detail, and often the date it was taken.
• near-duplicates. five shots of the same birthday candles, a second apart. these aren't really duplicates at all. you may want to keep one, or all of them. that's a choice, not a cleanup.

most of the space and confusion comes from the first two. start there and leave the near-duplicates for another day.

step 1: back up before you delete anything

before removing a single file, make sure everything you're about to clean has a second copy somewhere else, on a separate drive or in a cloud account. deleting duplicates is usually safe, but tools sometimes match pictures that only look alike, and a backup means a wrong guess costs you nothing. the 3-2-1 habit for family videos works just the same for photos.

step 2: gather everything into one place first

duplicate finders can only compare what they can see. if half your photos are on a drive and half are on a laptop, each side looks tidy on its own and the copies hide between them. so bring the photos together first, into one main folder or one photo library, and clean up after.

if you're still gathering, these guides help: getting photos off an old phone, recovering photos from an old hard drive, and downloading everything from google photos, icloud or facebook.

step 3: use the duplicate finder you already have

if your photos live in apple's photos app, you don't need anything extra.

• on an iphone or ipad with ios 16 or later, open the photos app and look for the duplicates album under utilities. it lists exact copies and pictures that look the same but differ in size or quality. tap merge on a pair, or select several and merge them together. the phone keeps the best-quality version, combines the useful details from the others, and moves the extras to recently deleted.
• on a mac running macos ventura or later, open photos and choose duplicates in the sidebar under utilities. it works the same way, with a merge button for each set.

if the duplicates album doesn't appear yet, give it time. the device looks for duplicates in the background, and on a large library that can take a while, often while it's locked and charging.

google photos works differently. it generally won't upload a file it already has, which keeps exact copies down, but it doesn't offer a cleanup tool for duplicates already in your library. if your collection lives there, it's often easier to download it all and clean the copies on your computer.

step 4: for folders on a computer, use a duplicate finder

for photos sitting in folders on a windows pc, a mac or a drive, a dedicated duplicate finder saves hours. free, open-source options such as dupeGuru and czkawka run on windows, mac and linux, and many paid tools do the same job.

whichever you choose, a few settings matter more than the brand:

• start with exact matches. most tools can compare file contents, not just names. two files called IMG_0412.jpg can be completely different pictures, and the same picture can have two different names. matching on contents avoids both mistakes.
• review before deleting. look through the list the tool gives you. a good tool shows each set side by side and lets you choose which one stays.
• move, don't delete. if the tool offers it, send the extras to a folder called something like duplicates to check, or to the recycle bin, rather than deleting them outright.
• treat "similar" matching with care. some tools can match pictures that look alike rather than files that are identical. that catches resized copies, but it also catches the five birthday-candle shots. check every match by eye.

step 5: choose which copy to keep

when two versions of the same photo turn up, keep the one that holds the most. in most cases that means:

• the largest file and the highest resolution. copies sent through messaging apps or saved from old websites are often shrunk.
• the one with the right date taken. some downloads and exports lose or change the date. if one copy says 2009 and the other says the day you downloaded it, keep the 2009 one. if neither is right, fixing wrong dates on photos walks through it.
• the original over the edited copy, unless you prefer the edit. if a cropped or brightened version is the one you love, it's fine to keep both.

step 6: empty the bin slowly

once the extras are in a holding folder or a recently deleted album, don't rush to empty it. on iphone and mac, recently deleted keeps items for up to 30 days before removing them for good. use that time. look through your library over the next week or two, and if nothing is missing, then empty it. if something is, you'll be glad it was still there.

a few things to leave alone

• don't delete across devices that sync. with icloud photos or google photos turned on, deleting a picture on one device usually deletes it everywhere. make sure that's what you mean.
• don't clean up the only copy of a folder you haven't backed up. back up first, every time.
• don't try to finish in one sitting. one year, one folder or one drive at a time is easier to check and easier to undo.

where treasure box fits

treasure box is the private life archive we're building to hold a whole life in one place, ordered by when things happened. the first version starts with photos and videos, laid out on one private timeline by the date each one was taken. a timeline with three copies of every picture is hard to enjoy, which is why clearing duplicates is one of the most useful things you can do before moving your photos anywhere.

the cleanup you do today is worth doing for any archive you use, now or later. if a private timeline sounds like the kind of home you'd want for your photos, see how treasure box works or read our privacy promises.

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