Not Enough Space for an iOS Update? How to Free Up Storage Safely

Why updates need free space

An iOS update has to download, unpack, and install while your current system is still running. That temporarily needs more space than the size of the download shown in Settings > General > Software Update. The exact amount varies by update and device, so it is worth freeing a comfortable margin rather than the bare minimum.

Step 1: Back up before you delete anything

Updates are generally safe, but a backup protects you if something goes wrong and protects anything you delete by mistake while making room.

• iCloud: Settings > [your name] > iCloud > iCloud Backup > Back Up Now. It needs enough iCloud storage.
• Computer: connect your iPhone to a Mac (Finder) or a Windows PC (the Apple Devices app or iTunes) and choose Back Up Now.

If you want an extra copy of your photos specifically, see how to back up iPhone photos to a computer or external drive.

Step 2: Look at the update screen's suggestions

When there is not enough room, iOS may offer to temporarily remove apps to make space for the update. If you accept, it deletes some apps during the update and reinstalls them afterward, keeping their data. This is an Apple feature and is generally fine to use, as long as you are on Wi-Fi and do not mind waiting for apps to come back.

You can also open Settings > General > iPhone Storage. The recommendations at the top, like offloading unused apps or reviewing large attachments, are often quick wins.

Step 3: Free space in the order that gives the most back

1. Empty Recently Deleted in Photos. Photos you deleted recently still use space for about 30 days. Open Photos, go to Recently Deleted, and delete all if you are sure. More on why.
2. Remove or offload big videos. A few long clips can be larger than the update. See how to find large videos.
3. Delete downloaded media. Movies, TV episodes, podcasts, and music downloads can be re-downloaded later.
4. Clear large Messages attachments. Here is how.
5. Offload apps you rarely use. Offload removes the app but keeps its data, so you can reinstall later.
6. Clear Safari website data if it is large. See clearing Safari and app caches.

Step 4: Delete the old update download if it is stuck

Sometimes a partially downloaded update sits in storage. In Settings > General > iPhone Storage, look for an entry named after the iOS update. If you see one, tap it and choose Delete Update, then try downloading again once you have more room.

Step 5: Update with a computer instead

Updating through a computer usually needs much less free space on the iPhone, because the computer downloads and prepares the update.

1. Connect your iPhone with a cable to a Mac or a Windows PC.
2. On a Mac, open Finder and select your iPhone in the sidebar. On Windows, open the Apple Devices app (or iTunes on older setups).
3. Back up first, then click Check for Update and follow the prompts.

Choose Update, not Restore. Restore erases the iPhone.

If the update keeps failing

If the download finishes but installation fails, make sure your iPhone is charging, on a stable Wi-Fi network, and has a little more free space than before. Restart the iPhone and try again. If an error repeats, updating with a computer as described above is usually the most reliable route. Apple Support can help if you see the same error message every time.

After the update

Storage numbers can look strange for a while after updating, and System Data may be larger for a few hours or days as iOS reindexes. Give it time and restart once before worrying. If it stays large, see what System Data is and how to reduce it.

This is also a good moment to clean up properly, so the next update is not a scramble. Storage Cleaner scans your photo library on your iPhone for duplicates, burst shots, similar screenshots, and large videos, and shows how much space you could get back before you delete anything. Scanning and previewing are free.

Checklist

1. Back up to iCloud or a computer.
2. Accept iOS's offer to temporarily remove apps, if shown.
3. Empty Recently Deleted in Photos.
4. Remove big videos and downloaded media.
5. Clear large Messages attachments and offload unused apps.
6. Delete a stuck update download and try again.
7. If space is still short, update with a computer.

FAQ

How much free space do I need for an iOS update?

It varies by update and device, and it is more than the download size shown. Freeing a comfortable margin is safer than aiming for the exact minimum.

Is it safe to let iOS remove apps temporarily for an update?

Yes. It is an Apple feature that reinstalls the apps after the update and keeps their data. Stay on Wi-Fi so they can download again.

Will updating with a computer erase my iPhone?

Not if you choose Update. Restore is the option that erases the device. Back up first either way.

Why is System Data bigger after updating?

iOS often rebuilds indexes and caches after an update. It usually settles down within a few days.