The short answer
Open Settings › General › iPhone Storage, accept the Recommendations, offload unused apps and clear large attachments. Then clean your photo library — duplicates, bursts and screenshots — and empty Recently Deleted. For most people that last step recovers more space than everything else combined.
Step 01
Find out what is actually using your storage
Before deleting anything, look at the breakdown. On most iPhones, Photos is the single biggest category — often more than apps, messages and podcasts combined.
- 1Open Settings › General › iPhone Storage.
- 2Wait for the coloured bar to finish calculating.
- 3Read the list underneath: it is sorted largest first.
- 4Note the top three categories — that is where your effort pays off.
If Photos sits at the top, skip straight to method 03. Everything else is rounding error by comparison.
Step 02
Accept the automatic recommendations
iOS suggests safe, reversible wins at the top of the iPhone Storage screen. They cost nothing and take seconds.
- 1In Settings › General › iPhone Storage, look at Recommendations.
- 2Turn on Offload Unused Apps — the app icon and its data stay, the binary is removed.
- 3Turn on Auto Delete Old Conversations if you keep years of iMessages.
- 4Enable Review Large Attachments and clear the videos you no longer need.
Offloading is reversible: tap the icon and the app redownloads with your data intact.
Step 03
Clean your photo library (usually the biggest win)
A camera roll of 10,000+ photos is normal, and most of it is duplicates, bursts, retakes and screenshots. Clearing those routinely frees several gigabytes without losing a single memory you care about.
- 1Start with Photos › Albums › Utilities › Duplicates and merge exact duplicates.
- 2Then Albums › Media Types › Screenshots — select and delete in bulk.
- 3Work through bursts and retakes: keep the sharpest frame, bin the rest.
- 4Check Albums › Media Types › Videos and sort by size; a few 4K clips can outweigh thousands of photos.
- 5Finally open Albums › Recently Deleted and tap Delete All.
Nothing frees space until Recently Deleted is emptied — files sit there for 30 days by default.
If photos are taking up most of your storage, Clean Cut can find the duplicate, similar and unnecessary photos for you — it groups every burst, retake and screenshot, suggests the sharpest keeper, and stages everything in a review pile so nothing is deleted without your confirmation. It runs entirely on your iPhone.
Step 04
Turn on Optimise iPhone Storage
If you use iCloud Photos, full-resolution originals can live in iCloud while your iPhone keeps smaller versions.
- 1Open Settings › your name › iCloud › Photos.
- 2Select Optimise iPhone Storage.
- 3Leave the phone on Wi-Fi and charging so it can swap the originals out.
This reduces local usage, not iCloud usage. If your iCloud plan is full, you still need to delete photos.
Step 05
Clear Safari and app caches
Browsers and streaming apps quietly cache gigabytes. Caches rebuild themselves, so clearing them is low risk.
- 1Settings › Apps › Safari › Clear History and Website Data.
- 2In Spotify, Netflix or podcast apps, delete downloads you have already watched or heard.
- 3For stubborn apps, offload and reinstall — that wipes the cache without losing account data.
Do not clear Safari data if you rely on saved site logins; you will be signed out.
Step 06
Delete apps you have not opened in a year
The iPhone Storage list shows a Last Used date under every app. It is a brutally honest audit.
- 1In Settings › General › iPhone Storage, scroll the app list.
- 2Tap any app with a Last Used date over a year ago.
- 3Choose Delete App to remove it and its data entirely.
Games are the usual culprits — a single AAA mobile game can take 5–10 GB.
Where the space usually is
| Category | Typical size | Effort to clear |
|---|---|---|
| Photos & videos | 20–120 GB | Low with a cleaner, high manually |
| Apps & games | 5–40 GB | Low |
| Messages & attachments | 2–20 GB | Low |
| Streaming downloads | 1–15 GB | Very low |
| System Data / caches | 2–10 GB | Indirect |
Frequently asked questions
Why is my iPhone storage full after deleting photos?
Deleted photos move to Recently Deleted and stay there for 30 days. Open Photos › Albums › Recently Deleted and tap Delete All. iOS also reports an 'Other'/System Data category that can hold caches; it usually shrinks on its own after a restart.
What is System Data on iPhone and can I delete it?
System Data covers caches, logs and temporary files. You cannot delete it directly, but restarting your iPhone, clearing Safari website data, and removing large streaming downloads all shrink it.
Does deleting photos free up iCloud storage too?
Yes, when iCloud Photos is on. Deletions sync across devices, but only count against your iCloud usage after Recently Deleted is emptied.
How much storage can photo cleanup realistically free?
It depends on library size, but a 10,000-photo camera roll typically hides thousands of duplicates, bursts and screenshots. Clearing those commonly recovers 5–25 GB.
Is it safer to clean photos manually or with an app?
Both are safe if the app never deletes without confirmation. Manual cleanup gives full control but takes hours; a cleaner that groups near-duplicates and stages deletions for review gets the same result far faster.
Photos eating your storage?
Clean Cut finds duplicate, similar and unnecessary photos, keeps your best shots, and never deletes anything without your say-so.