Pic Prune / Guide
How to free up iPhone storage
Start by finding out where the space actually went. It takes about a minute, it is free, and it stops you deleting the wrong things for an hour.
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The short version
Open Settings → General → iPhone Storage and wait for the bar at the top to fill in. It shows exactly what's using your space, by category, largest first. On most personal iPhones the answer is Photos, then video inside Photos, then apps.
Clear things in that order. Deleting apps you rarely open feels productive and usually recovers the least.
First, find out where it actually went
This is the step nearly every list of storage tips skips, and it's the one that saves you the most time.
- Open Settings.
- Tap General.
- Tap iPhone Storage, and give it a few seconds. The breakdown is calculated when you open it, so it's briefly blank.
You get a coloured bar showing usage by category, then a list of apps ordered by size, then a set of recommendations from iOS itself. The recommendations are worth reading: they're generated from your actual library rather than from a generic list.
Reading that screen
The bar is the important part, and the categories mean specific things.
| Band | What is in it | Worth attacking? |
|---|---|---|
| Photos | Your photo and video library | Usually the biggest, and usually yes |
| Apps | The apps themselves, plus their data | Only the two or three largest |
| Media | Downloaded music, podcasts, video | Often surprisingly large |
| Messages | Conversations and their attachments | Yes, if you've never cleared it |
| System Data | Caches, logs, temporary files | No, and you can't directly |
Ignore anything telling you to clear System Data. It is caches and logs that iOS manages itself, it shrinks when the device needs room, and there's no supported way to empty it. Apps that claim to do so aren't doing what they say.
The biggest wins, in order
Ordered by space recovered per minute spent, not by how satisfying it feels.
Video
If you shoot 4K, this is almost certainly your answer. These are the per-minute sizes iOS shows on your own phone under Settings → Camera → Record Video, and they vary a little by model, so read yours rather than trusting the table below.
| Setting | Per minute | Photos, at ~2.5 MB each |
|---|---|---|
| 4K, 60 fps | ~400 MB | about 160 |
| 4K, 30 fps | ~190 MB | about 75 |
| 1080p, 30 fps | ~65 MB | about 25 |
The right-hand column is arithmetic rather than a measurement: a HEIC photo from a recent iPhone is roughly 2.5 MB, so it is there for a sense of scale and not as a promise about your own library.
In Photos, tap Search and then Videos, and sort through the longest ones. A handful of forgotten screen recordings and one accidental twenty-minute clip in a pocket will often be several gigabytes between them.
Turning the camera down to 1080p for everyday use is the single change that stops the problem coming back.
Photos
The Photos band is usually the largest, and most of it isn't photos you chose to keep. It is the burst of nine, the fourteen tries at the same shot, the three versions of a group photo where somebody blinked.
Two things to do, in order:
- Merge the exact duplicates. Photos does this itself, free, under Collections → Utilities → Duplicates. It takes a couple of minutes.
- Clear the near-identical shots. The built-in tool deliberately leaves these alone, because each one is a genuinely different file. This is the larger pile and it needs comparing rather than merging.
The full method for both, including what iOS catches and what it doesn't, is in the companion guide: how to delete duplicate photos on iPhone. It's the deeper dive on the band that's usually biggest.
Pic Prune is built for the second job specifically: it groups the shots you took seconds apart so you can keep the best one and clear the rest, and the grouping runs on your iPhone rather than on a server.
Apps and Messages
Worth doing, though usually smaller than people hope.
- Offload the big ones. In the iPhone Storage list, tap any app and choose Offload App. The app goes, its data stays, and tapping the icon reinstalls it. Safe, and reversible.
- Streaming downloads. Netflix, Spotify, Podcasts and YouTube all cache downloads that are easy to forget. Podcasts in particular will happily hold a year of episodes you've already listened to.
- Message attachments. Go to Settings → Apps → Messages → Keep Messages and set it to 1 year instead of Forever. In the iPhone Storage screen, Review Large Attachments lets you delete the biggest videos people have sent you without losing the conversations.
Why buying iCloud storage didn't help
This is the most common misunderstanding about iPhone storage, and it costs people real money.
iCloud storage and iPhone storage are two different things. iCloud is space on Apple's servers for backups and syncing. Your iPhone's storage is the chip inside the phone. Buying more of the first doesn't empty the second.
What buying iCloud space does fix is backups that were failing and photo syncing that had stopped. Those are real problems, and if that was your symptom then the purchase was the right call. It is just not the same symptom as "Storage Almost Full" on the device.
The one setting that connects the two is under Settings → your name → iCloud → Photos, which is the route Apple documents in Set up and use iCloud Photos: choosing Optimise iPhone Storage keeps smaller versions on the device and the full-resolution originals in iCloud. That genuinely frees space on the phone, and it needs enough iCloud storage to hold the originals. It also means the originals only exist in one place, which is worth knowing before you rely on it.
If it is the iCloud side you are short of rather than the phone, Apple has a shortlist of its own. Recommended for You, under Settings → your name → iCloud, offers to remove photos, large files and old backups you probably no longer need. Apple added it in iOS 17 and documents it in Manage your iCloud storage and Manage your photo and video storage. It is framed as a low-storage tool, so it may have nothing to show you if the account is comfortable, and it will not touch the runs of nearly identical photos either way.
Why the number didn't move
You deleted a few hundred photos and the storage figure barely changed. There are two ordinary reasons.
Recently Deleted. Deleted photos sit in that album for 30 days and count against your storage the whole time. Open Collections → Utilities → Recently Deleted, tap Select, then Delete All to get the space back now. That step is permanent.
The figure is recalculated lazily. The iPhone Storage screen doesn't update live. Leave it, come back, and it'll have caught up.
Questions people actually ask
Does buying more iCloud storage free up space on my iPhone?
Not on its own. iCloud storage and iPhone storage are two separate things. Buying more iCloud space stops your backups and photo syncing from failing, but it does not by itself remove anything from the device. The one setting that does is Optimise iPhone Storage under Photos, which keeps smaller versions on the phone and the full-resolution originals in iCloud.
What is "System Data" and how do I clear it?
System Data is caches, logs and temporary files that do not belong to any one app. It grows and shrinks on its own, and iOS clears it when the device needs room. There is no supported way to empty it directly, and apps promising to do so are not doing what they claim. If it is genuinely enormous, a backup and restore is the only reliable reset.
What does "Offload Unused Apps" actually do?
It removes the app itself but keeps its documents and data, so the icon stays on your Home Screen with a small cloud symbol and tapping it reinstalls the app with your data intact. It is a safe first move, though on most phones it recovers less than people expect, because app binaries are small next to photos and video.
Why is my iPhone storage full when I have hardly any apps?
On most personal iPhones the answer is photos and video. Check Settings → General → iPhone Storage and read the bar at the top: it breaks usage down by category, and Photos is usually the largest band by a wide margin.
How much space does a minute of video use?
Roughly 190 MB per minute at 4K 30fps on a recent iPhone, climbing steeply at 60fps. Your own phone prints the figure for each setting under Settings → Camera → Record Video, and it varies a little by model. Either way a minute of 4K costs about the same as a hundred photos.
Is it safe to delete photos from Recently Deleted?
It is permanent, so only do it when you are sure. Everything in that album is already deleted from your library; emptying it just gives the space back now rather than in 30 days. If iCloud Photos is on, it is gone from every signed-in device too.
Where to go next
- What Optimize iPhone Storage Does, and What It Leaves Behind. What Optimize iPhone Storage does to your photos, how to turn it off, and why a phone can still run short of room after you switch it on.
- What an iPhone Storage Cleaner Can and Cannot Clear. What an iPhone storage cleaner can genuinely reach, why Apple ships no cleaner app of its own, and where the space on a full phone actually goes.
- How Much Is iCloud Storage? Plans, Prices, How to Need Less. Which iCloud+ tier suits you, where to read the current price on your own phone, and how to get under a plan boundary so you stop paying for the tier above.
- How to Clear iCloud Storage. What is actually taking up your iCloud storage, how to see it in about a minute, and how to clear it in the order that frees the most space.
- How to Delete Screenshots (and Stop Them Piling Up). Screenshots are the easiest thing in a photo library to clear, because almost none of them were meant to be kept. Here is how to find and delete them in bulk.
- iCloud Storage Full? What It Means and How to Fix It. What actually stops working when iCloud storage is full, what is safe to ignore, and the order to clear things in so backups and photo syncing start again.
- Why Is My iPhone Storage Full After Deleting Everything?. Recently Deleted, System Data and a storage figure that updates lazily explain almost every case where you deleted a lot and the number barely moved.
- How to delete duplicate photos on iPhone. The deeper dive on the band that is usually biggest.
- All articles. More on photo storage, iCloud and keeping a library under control.