How to Free Up iPhone Storage Before an iOS Update

Q: How much space do I need for iOS update?

Minor updates need roughly 500 MB–1 GB free. Major iOS version updates need 2–5 GB. The installer also temporarily needs 2× the file size during installation, so having 5 GB free before a major update is safe.

Q: Why can't I update my iPhone due to storage?

iOS updates require free space both to download and to install. If your available storage is lower than the update size (plus working room), iOS shows 'Cannot Install Update.' Free up space using the steps above, or update via Mac/PC.

Q: Does installing iOS update free up storage?

Sometimes. iOS updates occasionally clean up old system files during installation. But you should not count on this — free the space first, then update.

Fastest fix: Delete all screenshots (Photos > Albums > Screenshots > Select All > Delete), then empty Recently Deleted (Photos > Albums > Recently Deleted > Delete All). This alone frees 1–5 GB for most users in under 2 minutes.

How Much Space Does an iOS Update Need?

Update Type	Minimum Free Space	Recommended Free Space
Minor update (x.x.x)	500 MB–1 GB	2 GB
Major update (new iOS)	2–3 GB	5 GB

Step 1 — Check Available Storage

Settings → General → iPhone Storage. The colored bar at the top shows how much is used and available. Note the exact available amount and compare to what the update notification says it needs.

Step 2 — Delete Screenshots (Fastest Win)

Open Photos → Albums → Screenshots
Tap Select
Tap the first screenshot, drag all the way to the bottom
Tap Delete

The average iPhone has 200–500 screenshots. At ~500 KB each, deleting all screenshots can free 100 MB–250 MB immediately — plus screenshots from apps are often larger.

Step 3 — Empty Recently Deleted Immediately

Photos → Albums → Recently Deleted
Tap Select → Delete All → Delete

This is critical. Deleted photos sit in Recently Deleted for 30 days and still consume storage. If you've deleted anything recently, this step can free gigabytes instantly.

Step 4 — Offload Unused Apps

Settings → General → iPhone Storage
The app list is sorted by size — look at the top
Tap a large app you don't use often → Offload App

Offloading removes the app binary but keeps its data — so if you reinstall later, your data is still there. A single large game can free 1–3 GB.

Step 5 — The App Store Cache-Clearing Trick

This is a legitimate iOS behavior that most people don't know about:

Open the App Store
Search for a large app (search "GTA San Andreas" or any large game — look for 2+ GB)
Tap Get to start downloading it
iOS automatically clears cached files to make room for the download
Cancel the download immediately after it starts

This can clear 500 MB–2 GB of system caches that iOS won't let you delete manually. Try it once, then check available storage again.

Step 6 — Update via Mac or PC (Last Resort)

If you still don't have enough space after all the above:

Connect iPhone to Mac or PC with a USB cable
Open Finder (Mac) or iTunes (PC)
Select your iPhone and click Check for Update
The update file downloads to your computer — not your iPhone
Only a small amount of device space is needed for installation

Frequently Asked Questions

How much space do I need for iOS update?

5 GB free is safe for a major update. Minor updates need 1–2 GB. The installer temporarily needs 2× the file size during the process.

Why can't I update my iPhone due to storage?

iOS needs space to download the update AND temporarily unpack it. Use the steps above or update via Mac/PC.

Does installing iOS update free up storage?

Sometimes — updates occasionally clean old system files. Don't count on it. Free space first.