To check what is using iPhone storage, open Settings › General › iPhone Storage. iOS shows a color-coded bar at the top and a ranked list of every app and category below it, sorted by how much space each one uses. From there you free up space fastest by tackling the biggest items first, usually videos, photo libraries, app caches, and "System Data."
TL;DR
- The storage breakdown lives in Settings › General › iPhone Storage and lists apps by size.
- Start with the largest categories: Photos, large videos, and oversized app caches.
- "System Data" (formerly "Other") is caches and logs; it shrinks on its own and after a restart.
- Check Recently Deleted, Downloads, and Messages attachments before assuming the system is at fault.
- Review before bulk-deleting so you keep the photos and files that still matter.
Where is the iPhone storage breakdown?
The iPhone storage breakdown is a built-in screen at Settings › General › iPhone Storage. iOS analyzes your device and draws a stacked bar showing categories like Photos, Apps, Media, Messages, and System Data, then lists individual apps from largest to smallest. Tap any app to see how much space the app itself uses versus its documents and data. iOS also surfaces personalized Recommendations near the top, such as "Review Large Attachments" or "Offload Unused Apps," which are safe, reversible suggestions tailored to your usage.
What usually takes up the most space on an iPhone?
On most iPhones the biggest space users are, in order: the Photos library (especially 4K video and 48MP ProRAW shots), large individual videos, streaming and social apps caching content, and Messages with years of attachments. "System Data" can also balloon temporarily. The fastest wins come from media, not from deleting small apps. Here is how the common categories typically compare:
| Category | Why it grows | Fastest fix |
|---|---|---|
| Photos & Videos | 4K/48MP capture, duplicates, bursts | Delete large videos and duplicates first |
| Apps & app data | Cached streams, downloads, offline files | Offload unused apps; clear in-app caches |
| Messages | Years of photos, videos, GIFs | Review Large Attachments; auto-delete old messages |
| System Data | Caches, logs, temp files | Restart; it self-clears over time |
How do I free up space after checking what's using it?
Once you know what's using your storage, work top-down so you reclaim the most gigabytes in the fewest taps:
- Open Settings › General › iPhone Storage and note the top three space users.
- In Photos, delete the largest videos and obvious duplicates, then empty Photos › Albums › Recently Deleted.
- Tap each large app and choose Offload App to remove the app but keep its data, or clear its in-app cache.
- In Messages, open Review Large Attachments from the Recommendations and delete bulky media.
- Empty Files › Browse › Recently Deleted and your Downloads folder.
- Restart the iPhone to let "System Data" recalculate.
Is it safe to delete these items?
Yes, when you stick to the built-in tools. Offloading an app deletes the app binary but preserves your documents and settings, so reinstalling restores everything. Clearing an app cache removes only re-downloadable data, not your accounts or saved files. The one thing to watch is Photos: deleted items sit in Recently Deleted for 30 days, so anything you remove is recoverable for a month, but emptying that album is permanent. Review before you empty it, and confirm your photos are backed up to iCloud or Google Photos first.
FAQ
Why is my iPhone storage full even after deleting photos?
Deleted photos stay in Photos › Albums › Recently Deleted for 30 days and still occupy space until you empty that album. "System Data" caches can also temporarily mask the freed space; a restart usually corrects the number. See why iPhone storage stays full after deleting photos.
What is "System Data" on my iPhone?
System Data (formerly "Other") is caches, logs, Siri voices, and temporary files iOS keeps to run smoothly. It grows and shrinks automatically and usually drops after a restart, so it rarely needs manual intervention. Read more on why System Data is so high on iPhone.
How do I see which apps use the most storage?
Open Settings › General › iPhone Storage and the apps are listed largest-first. Tap any app to split its size into the app itself versus its documents and data.
Does offloading an app delete my data?
No. Offloading removes the app binary to free space but keeps all your documents and data. Reinstalling the app restores your previous state exactly.
Where to go next
If manual review feels slow, a guided flow makes the cleanup faster. See our clean up phone storage hub for the full method, learn how to check what's taking up space step by step, or read how to free up 5-10 GB on iPhone in 10 minutes. To find duplicates and large videos automatically and review each one before it's deleted, the Cleanor iPhone app handles the scanning so you only confirm.