Short answer: open Settings → General → iPhone Storage and read the bar at the top before deleting anything. On most phones that are full, Photos is the largest single item, and within Photos the weight is in video, not images. Apps come second, and much of that is re-downloadable.
Clear in this order, because it is the order of space recovered per minute spent: large videos first, then screenshots, then near-duplicate photo bursts, then apps you have not opened in a year. Offload rather than delete apps you still want — the documents stay, only the app itself goes. Ignore System Data at the start: it is mostly caches iOS reclaims on its own, and there is no supported way to clear it directly. And whatever you delete, remember it still counts against your storage until Recently Deleted is emptied, which is why the free space often appears not to move at first.
How do I see what is using my iPhone storage?
- Open Settings → General → iPhone Storage.
- Wait for the bar to finish calculating — it is slow on a full phone.
- Read the list underneath, sorted largest first. That list, not the bar's colours, tells you where the space went.
Photos at the top is the normal case for anyone who takes pictures. A 128 GB iPhone with a few years of use is routinely carrying 60–90 GB of photos and video.
Why is System Data so large, and can I clear it?
System Data (older iOS calls it "Other") holds caches, logs, streaming buffers and update files. It inflates after big downloads and usually shrinks by itself when the system needs room. There is no Apple-supported button to empty it, and no third-party app can reach it either — iOS sandboxing does not allow it.
If it has grown to tens of gigabytes and stayed there, the reliable fix is a backup and restore, not an app. Treat it as the last resort, after the photo library is genuinely clean.
What should I clear first?
| Order | What | Why it is first |
|---|---|---|
| 1 | Large videos | One 4K clip can equal a thousand photos |
| 2 | Old screenshots | Hundreds of them, almost never needed twice |
| 3 | Burst and near-duplicate photos | Bulk of a camera roll; needs your judgement |
| 4 | Unused apps | Offload keeps the data, frees the binary |
Each of the first three has its own guide: large videos, screenshots, and duplicate and similar photos.
How do I clear photos without spending an evening on it?
The slow part is deciding, not deleting. CleanRoll scans on the device and groups the library into the categories above, so each decision is one swipe instead of a hunt.
- Install CleanRoll: Camera Roll Cleaner (iPhone, iOS 26.2 or later).
- Grant Photos access. The scan runs on the device — nothing is uploaded.
- Start with Large videos, sorted biggest first, then Old screenshots, then Near-duplicates.
- Confirm each batch yourself. Deleted items sit in Recently Deleted for about 30 days.
50 reviews per 24 hours are free; unlimited is a one-time $7.99 unlock, with no subscription.
Frequently asked questions
Does iCloud Photos free up space on my iPhone?
Partly, and it is the most misunderstood setting on the phone. With iCloud Photos on and "Optimise iPhone Storage" selected, full-resolution originals live in iCloud and the device keeps smaller versions, downloading the original only when you open or edit it. That genuinely reclaims space — but the library is still there, still listed under Photos in Settings, and still growing. You have moved the cost, not removed it, and past 5 GB you are paying iCloud+ for the privilege.
It also does not mean the photos are backed up somewhere separate: iCloud Photos is sync, not backup, so a deletion on the iPhone removes the photo from iCloud and from every other device signed in to the same Apple Account. If the phone is full and the library is genuinely cluttered, deleting is still the fix; optimisation just buys time. Apple's setup details are in Set up and use iCloud Photos.
Why is my storage still full after deleting photos?
Because deleting a photo does not immediately remove it. It moves to Recently Deleted, where it stays for 30 days and keeps occupying exactly as much storage as before. Clear a few gigabytes of video and the free-space number can look almost unchanged until you empty that album: Photos → Collections → Utilities → Recently Deleted → Select → Delete All.
Two other reasons the number lags. Settings → General → iPhone Storage caches its figures and can take a minute or two to recalculate on a full phone, so it is worth backing out and reopening rather than trusting the first reading. And if iCloud Photos is on with Optimise iPhone Storage, iOS may quietly re-download originals into the space you just cleared. If the number still has not moved after emptying Recently Deleted and waiting, restart the phone before assuming something is wrong.
Do cleaner apps actually work, or are they a scam?
Both exist, and the difference is easy to spot once you know what to look for. A legitimate cleaner does exactly one useful thing: it groups and presents your own library so you can decide faster. It cannot free a single byte on its own — the space comes from deletions you confirm, and iOS sandboxing means no third-party app can reach caches, logs or System Data at all.
So treat these as warning signs: a promise to "clean System Data" or "junk files", which no App Store app can do; a one-tap clean that deletes without showing you what; a scan that reports a dramatic number before you have granted any access; and a subscription charged monthly to delete files you already own. A cleanup tool is a sorting aid you might use a few times a year, and its pricing should look like that.
Should I delete apps or photos first?
Photos, usually — but the reasoning is worth separating. Apps are the reversible choice: Settings → General → iPhone Storage lets you Offload an app, which removes the binary and keeps its documents and data, so reinstalling restores it as you left it. Deleting an app outright removes its data too. Either way, anything you bought stays bought.
Photos are the irreversible choice, which is why they deserve the slower, more deliberate pass — and also where the gigabytes actually are. On a full phone the photo library routinely outweighs every app combined several times over, so clearing apps first often means an hour spent for a couple of gigabytes, then discovering you still have to do the photos. Start with the largest videos, which is the best space-per-decision in the whole library, and offload unused apps at the end as a top-up.
CleanRoll is a free download from SLOCC LLC. Review 50 items per 24 hours, or unlock unlimited once for $7.99.
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