When an iPhone says storage is full, the quickest route is to open Settings, tap General, tap iPhone Storage, and look at which categories and apps are largest. Most of the space you can safely recover comes from apps, videos and photos. The System and Other categories (often called System Data) are managed by iOS, and you cannot delete them directly.
This guide is for anyone who sees a "Storage Almost Full" alert, cannot take photos or install updates, or is confused by a large gray System Data bar. By the end you will know how to read the storage screen, what each category means according to Apple, which actions are safe, and how to use iCloud Photos without losing originals.
Who this is for and what you will have at the end
This is written for iPhone owners in the US who want to free space without paying for a new phone or deleting memories. It assumes nothing technical. You will finish with:
- A clear picture of what is using space on your phone.
- An ordered list of actions, from safest to most disruptive.
- A safe setup for photos, so you do not delete the only copy of anything.
- A short checklist to keep the problem from coming back.
If you want a broader overview that also covers Android, read Phone Storage Full: How to Free Up Space on Android and iPhone. For Mac owners, Mac Storage Full: Free Up Space and Understand System Data covers the same confusion on a computer.
Before you start: protect what you cannot replace
Deleting is permanent once the recovery window closes, so spend two minutes on safety first.
- Confirm that your photos exist somewhere other than this phone. That means iCloud Photos, a computer, or another backup. See iPhone Backup: iCloud vs Computer and How to Restore for how to check.
- Connect to Wi-Fi and plug in the charger if you plan to let iCloud upload photos.
- Do not start with the Photos app. Start by looking at what is using space, because the biggest item is often not photos.
One warning from Apple's iCloud Photos page matters throughout this guide: when you delete photos and videos on one device, they are deleted everywhere that you use iCloud Photos. Deleted items stay in the Recently Deleted folder for 30 days, after which they are permanently removed.
Step 1: read the iPhone Storage screen
- Open Settings.
- Tap General.
- Tap iPhone Storage.
You see a colored bar at the top, a list of recommendations, and a list of apps sorted by the space they use. Tap any app name to see details. Apple notes that cached data and temporary data might not count as usage in the app details, which is one reason app totals do not always add up to the whole bar.
What System and Other mean
Apple's storage page does not use the phrase "System Data". It describes categories instead:
| Category | What Apple says it is | Can you remove it? |
|---|---|---|
| System | Space taken by the operating system; it varies by device and model | No |
| Other | Non-removable items such as Siri voices, fonts, dictionaries, logs, caches, the Spotlight index, and system data such as Keychain and the CloudKit database | Not directly |
Apple adds that your device removes cached and temporary files on its own when it needs space, and that you cannot delete cached files yourself. In practice this means a large System or Other number is not something to fight with settings. Free space elsewhere and iOS will reclaim its own temporary files as needed.
Synced content from a computer
If you ever synced music, videos or photos from a Mac or PC, Apple says that content is counted under Other in Finder, the Apple Devices app or iTunes, and can only be removed from the computer. You deselect the content there and click Sync. You cannot remove it from the iPhone itself.
Step 2: turn on the storage recommendations
Right under the colored bar you may see recommendations. Apple's steps:
- In the storage section, tap Show All to see every recommendation for your device.
- Read each description.
- Tap Enable to turn one on, or tap the recommendation to review what you can delete.
Recommendations are the safest first move because iOS shows you what it will do. One example you may see is Offload Unused Apps.
Step 3: offload apps instead of deleting them
Offloading and deleting are different actions, and the difference matters if you worry about losing app data.
| Action | What happens to the app | What happens to documents and data |
|---|---|---|
| Offload | Removed, freeing its storage | Kept |
| Delete | Removed | Removed with the app |
To offload one app:
- Go to Settings > General > iPhone Storage.
- Tap the app's name.
- Choose the offload option in the detail view.
Start with large apps you rarely open, such as games, airline apps, or streaming apps you can sign back into. Reinstalling an offloaded app puts it back with its data. If the app has no data you care about and you are sure you will not use it, delete it instead.
Step 4: review photos and videos with iCloud Photos in mind
Photos and videos are often the largest item on the list. Before deleting any, understand how iCloud Photos works, because it changes what "delete" means.
How Optimize Storage works
When iCloud Photos is on, Apple's guide says the iPhone can keep smaller, space-saving copies while iCloud keeps the full-resolution originals. Optimize Storage is on by default when iCloud Photos is turned on, according to Apple's photo storage page.
To check or change it:
- Open Settings, tap your name, then tap iCloud.
- Tap Photos. Under Saved to iCloud, this is the Photos row.
- Make sure the sync switch is on. Apple's wording differs by version: it appears as Sync this iPhone or Sync this device.
- On iOS 27 or later, tap iPhone Storage and make sure Optimize iPhone Storage is on. On iOS 26 or earlier, choose Optimize Storage directly on this screen.
Menu wording changes between iOS versions, so if your screen differs slightly, look for the Photos row under iCloud and the word Optimize.
This only saves space if your iCloud plan has room for the full library. If iCloud storage is full, uploads stop. See iCloud Storage Plans and Pricing in the US: What to Choose before deciding on a paid plan.
Recommended for You (iOS 17 or later)
Apple's photo storage page says that on iOS 17 or later you can use the Recommended for You feature to find photos, large files and backups you may no longer need, and then delete them. Use it as a list of candidates, not as a command. Look at each item before removing it.
Deleting safely
If you do delete photos or videos:
- Delete from the Photos app on the phone.
- Remember that with iCloud Photos on, the same photos disappear from your other devices and from iCloud.
- Open the Recently Deleted album if you need the space immediately. Items remain there for 30 days, so the storage is only freed when they are removed from that album or the 30 days pass.
- If you want to keep photos but not store them in iCloud, move them to a computer first. See Transfer Photos from iPhone to a Windows PC.
Long videos take far more space than photos, so look for long clips in the Videos album first and move the ones you want to a computer before deleting.
Step 5: clear browser data
Safari stores history and website data. Apple's support pages describe the path as Settings, then Apps, then Safari on current iOS versions. From there:
- Confirm the timeframe, then tap Clear History to remove history.
- To clear cookies and cache while keeping history, open Advanced, choose Website Data, and remove the website data.
Clearing website data signs you out of some sites, so make sure you know your passwords first. The freed space is usually small compared with video and apps, so do this after the larger steps. Menu labels vary between iOS versions.
Verify that space was freed
- Return to Settings > General > iPhone Storage.
- Compare the total used with what you saw before.
- Check Recently Deleted in Photos. If it holds gigabytes, the space is not yet free.
If you have freed several gigabytes and the storage alert disappears, you are done. If you are still full, repeat the offload step for more apps or move more videos to a computer.
Troubleshooting
Storage will not drop after deleting photos
The most common cause is Recently Deleted. Items stay there for 30 days. Open the Recently Deleted album and delete the items there if you are certain you do not need them.
System or Other stays large
Apple describes these as managed by iOS and not removable by you, and says cached and temporary files are cleared automatically when the device needs space. Free space by removing apps and videos, and let iOS handle the rest.
Optimize Storage is on but photos still fill the phone
Optimize Storage keeps smaller copies only when space is needed, according to Apple. If photos are still large, confirm that iCloud Photos is actually syncing and that your iCloud plan has room. See the iCloud plans article above.
I deleted a photo and it vanished from my iPad
This is expected. Apple states that deleting photos on one device deletes them everywhere you use iCloud Photos. If it was a mistake, check Recently Deleted within 30 days.
A Storage Almost Full alert keeps returning
Apple's guidance is to check the recommendations or remove content such as videos and apps. If you cannot get below the limit, the phone may simply be too small for how you use it. Consider moving photos to a computer permanently or paying for iCloud so Optimize Storage has room to work. If the phone is also slow to update, see iPhone Software Update Stuck: How to Fix It.
Closing checklist
- Confirm photos are backed up somewhere before deleting anything.
- Open Settings, General, iPhone Storage and note the top three items.
- Tap Show All under recommendations and enable the ones you understand.
- Offload large apps you rarely use rather than deleting them.
- Check that iCloud Photos and Optimize Storage are set the way you expect.
- Remember that deleting a photo deletes it everywhere on iCloud Photos, with a 30-day recovery window.
- Empty Recently Deleted only when you are sure.
- Do not try to delete System or Other directly; free space elsewhere instead.
- Recheck the storage screen after emptying Recently Deleted.
References
Checked on 2026-11-05.
- Apple Support, Check storage on your iPhone, iPad and iPod touch: https://support.apple.com/en-us/108429
- Apple Support, Set up and use iCloud Photos: https://support.apple.com/en-us/108782
- Apple Support, Manage your photo and video storage: https://support.apple.com/en-us/105061
- Apple Support, Delete your Safari history, cache, and cookies on iPhone: https://support.apple.com/en-us/105082
This guide was researched and drafted with AI assistance and checked against the vendor documentation listed in its References. Read the maintained version and related guides on EpiFive.
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