iPhone storage full? Here's where the space actually went

First, see what is actually using the space

Before deleting anything, get the real numbers. Open Settings → General → iPhone Storage. iOS draws a bar at the top broken down by category, and below it a list of every app ranked by size.

Two things on this screen matter more than people expect:

• The bar takes a minute to settle. When you first open it, iOS is still calculating. Wait until the segments stop moving before drawing conclusions.
• "System Data" is not a bug. It absorbs caches, logs and temporary files, and it grows and shrinks on its own. It is usually the last thing worth attacking, not the first.

On most phones, Photos is the largest single entry by a wide margin. That is where this guide spends most of its time.

Empty Recently Deleted — the fastest gigabytes you will get back

This is the one almost everybody misses. Photos and videos you delete are not removed. They move to a holding album for 30 days, and they occupy exactly as much space there as they did before.

If you have had a clear-out at any point in the last month, that space is still gone.

1. Open Photos.
2. Tap Albums, scroll to the bottom, open Recently Deleted.
3. Tap Select, then Delete All.

This is permanent, so check the album before you empty it. But if you have already decided those photos were going, this recovers their full size immediately.

Delete duplicate photos

Duplicates accumulate quietly: a photo arrives over AirDrop and you save it, someone sends the same picture in two group chats, an app re-saves an image after editing it. Each copy is full size.

iOS has a built-in tool. In Photos → Albums → Utilities → Duplicates you will find exact duplicates that iOS detected, with a Merge button that keeps the highest quality version.

It is worth running, but be aware of its limits: it only catches items iOS considers identical, it does not find similar photos, and on large libraries it can take days to populate — or never appear at all if iOS decides there is nothing to show.

For a complete pass you need something that compares the images themselves rather than only the file. Full guide to deleting duplicate photos on iPhone →

Clear out near-identical shots

Duplicates are the small half of the problem. The bigger half is photos that are not identical but may as well be: burst sequences, four attempts at the same group shot, the same view taken twice because the first one looked slightly off.

These are different files, so no duplicate finder — including Apple's — will touch them. But a library that has been used normally for a few years is usually 20–30% near-identical shots, and each one is a full-size photo.

The only way through is to see them grouped side by side, keep the best of each set, and delete the rest. Doing that by hand in the Photos app is impractical; this is the specific job iPhone Cleaner was built for, using on-device analysis to group visually similar shots so you pick one keeper per group.

Find the videos eating the most space

One minute of 4K video at 60 fps is roughly 400 MB. A ten-minute clip you recorded once and never watched is 4 GB — more than a thousand photos.

To find them without third-party help, open Photos → Albums → Media Types → Videos. There is no sort-by-size in the Photos app, so you are checking durations by eye and opening each one's info panel.

Two settings worth changing while you are here, both under Settings → Camera:

• Record Video — 4K/60 looks superb and costs about four times what 1080p/30 costs. For everyday recording, 1080p/60 is a reasonable middle.
• Formats → High Efficiency — records in HEVC/HEIF instead of the older formats, roughly halving the size of everything you shoot from now on.

For videos you want to keep, compression is a better answer than deletion. How to compress photos and videos on iPhone →

Delete screenshots you will never open again

Screenshots are the easiest storage to give up, because almost nobody wants them a month later: boarding passes from a trip you have taken, receipts, a Wi-Fi password, memes, a recipe you screenshotted instead of saving.

Open Photos → Albums → Media Types → Screenshots, tap Select, and work backwards from the oldest. A phone that is a few years old commonly has several thousand.

Screen recordings live in the Videos album rather than here, and they are much larger per item — worth a separate pass.

Stop Messages keeping everything forever

By default, iOS keeps every message and every attachment you have ever received, indefinitely. Years of photos, videos and voice notes sent in chats sit in Messages, separate from your photo library.

Two fixes:

1. Settings → Apps → Messages → Keep Messages → 30 Days (or 1 Year). iOS asks whether to delete older messages now — accept, and it clears them.
2. Settings → General → iPhone Storage → Messages shows Review Large Attachments, which lists the heaviest photos and videos ever sent to you, biggest first. This is often several gigabytes on its own.

Offload apps instead of deleting them

Offloading removes an app's program files but keeps its documents and data. Reinstall it later and you carry on where you left off — useful for large apps you use twice a year.

For a single app: Settings → General → iPhone Storage, tap the app, tap Offload App.

To let iOS do it automatically when space runs low, turn on Offload Unused Apps on the same screen.

Check the Documents & Data figure for each app too. Streaming apps are the usual offenders — downloaded episodes and offline playlists can run to many gigabytes, and offloading does not remove them. Delete downloads from inside the app itself.

Clear the Safari cache

Smaller than the others, but free and instant: Settings → Apps → Safari → Clear History and Website Data.

This signs you out of websites, so expect to log back in to things. It typically returns a few hundred megabytes rather than gigabytes.

Use iCloud Photos properly — and understand what it does not do

Turning on Settings → [your name] → iCloud → Photos → Optimise iPhone Storage keeps full-resolution originals in iCloud and smaller versions on the device, downloading the original when you need it.

Two things to be clear about:

• It is not a backup. iCloud Photos is a sync service. Delete a photo on your iPhone and it is deleted from iCloud and from every other device signed in to the same Apple Account.
• The free tier is 5 GB, which no real photo library fits into. Beyond that it is a monthly subscription — which is a perfectly reasonable choice, but it is renting space rather than recovering it.

What not to bother with

A few widely-shared tips that do not hold up:

• "Rent a film to clear cache." This referred to an old iOS behaviour that no longer applies. It does not work, and you have rented a film.
• Restarting to fix System Data. A restart clears some temporary files, but System Data regrows within days. It is not where your storage went.
• Apps promising to clean "junk files". iOS sandboxes every app: no third-party app can see or delete another app's caches. Any app claiming to clear system junk on iPhone is describing something the platform does not permit. What a cleaner app can legitimately do is work with your photo library, contacts and — with your permission — a connected email account.

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