When the App Store says it can't download because storage is full, free up space in Settings > General > iPhone Storage by tapping Offload Unused Apps and deleting one or two large videos. Apps need roughly double their final size during install (the package plus unpacking), so free more than the app's listed size. Once you're a gigabyte or two clear, the download resumes automatically.
TL;DR
- Free more than the app's listed size; installs need temporary space to unpack.
- Offload Unused Apps removes the app but keeps its data and icon.
- Deleting one 4K video (300 MB to 2 GB) often clears enough room.
- Clear old downloads, podcasts, and offline videos in their apps.
- Stuck "Waiting" downloads usually free themselves once space is available.
Why won't my iPhone download an app when storage is full?
Installing isn't just copying a file. iOS downloads the app package, then unpacks and verifies it, so it briefly needs more free space than the app's final size. A 1.5 GB game can require 3 GB free mid-install. If you're sitting at a few hundred MB free, the download fails or hangs on "Waiting" with a storage warning.
The fix is to clear comfortably more than the app needs, then let the download retry.
How much space do I actually need to free?
A safe rule: free at least twice the app's listed size, plus a buffer. Check the size on the App Store listing under the app's name.
- Small app (50-200 MB): free ~500 MB.
- Medium app (500 MB-1 GB): free ~2-3 GB.
- Large game (2 GB+): free ~5 GB.
Always leave at least 1-2 GB of general headroom so the phone keeps running smoothly afterward.
What's the fastest way to free that room?
Work top-down in Settings > General > iPhone Storage:
- Offload Unused Apps. Tap the recommendation or open an app you rarely use and choose Offload App. This removes the app binary but keeps its documents and data, so reinstalling later restores everything.
- Delete big videos. Sort your Photos by size or check Review Large Attachments, then remove a couple of 4K clips. This is usually the single biggest win.
- Clear in-app downloads. Streaming and podcast apps hoard offline files: delete downloaded episodes in Podcasts, offline shows in Netflix/YouTube, and offline maps.
- Empty Recently Deleted. In Photos > Albums > Recently Deleted, tap Select > Delete All to actually release deleted media.
Return to the App Store; the download should resume on its own. If it doesn't, tap the cloud/download icon again.
Where does iOS stop helping?
iOS offers Offload Unused Apps and a sorted storage list, which is genuinely useful. But it won't reclaim the space hidden in duplicate photos, similar burst shots, oversized screen recordings, or cached "Other" data. It also won't tell you that ten near-identical photos are wasting a gigabyte. So you can offload every app and still be full because your real bulk is media iOS treats as untouchable.
If your storage seems full with nothing obvious to remove, see iphone storage full but nothing to delete what's actually using it.
What if I still can't download after freeing space?
- Empty Recently Deleted again. Deleted media only frees space once that album is cleared.
- Restart the phone. This forces iOS to recalculate free space and retry pending downloads.
- Check it's storage, not network. If the message is about Wi-Fi or "Unable to Download," that's a different issue.
For a calm, ordered cleanup that frees real gigabytes, use how to free up 10GB on iPhone in 10 minutes safe order.
Will offloading or deleting lose my data?
Offloading is safe: Offload App keeps your documents and settings, and the icon stays with a small cloud badge so you can reinstall and pick up where you left off. Deleting an app removes its data, so only delete apps you truly don't need. For photos, deletions go to Recently Deleted and stay recoverable for about 30 days, so back up to iCloud or your computer first if you're unsure.
FAQ
How much free space do I need to install an app?
Free at least double the app's listed size. A 1 GB app can need 2-3 GB during install because iOS downloads and then unpacks the package. Leave 1-2 GB of headroom beyond that so the phone stays responsive.
Does offloading an app free enough space to download a new one?
It can for small apps, but offloading only removes the app binary, not its data. If you need several gigabytes, deleting a couple of large videos usually frees far more than offloading a single app.
Why does the download say "Waiting" instead of failing?
"Waiting" often means iOS paused the install for lack of space. Free a few gigabytes, then tap the icon to resume; it typically continues automatically once enough room is available.
If you keep hitting "storage full" every time you want a new app, the fix is clearing the media iOS overlooks. Cleanor for iPhone finds your largest videos, duplicate photos, and screen recordings and removes them in a few taps so you can fix a full phone fast. For the full method, see how to free up iPhone space.