How to Free Up iPhone Photo Storage with Optimize Storage

Optimize Storage keeps full-resolution originals in iCloud and lets your iPhone use smaller versions as space is needed. Your library remains available in Photos, but downloading an original can require Wi-Fi or cellular access.

The settings below cover iOS 26 and iOS 27. Use this workflow when you want to keep your photo library in iCloud and have enough cloud capacity for it.

1. Check both storage limits

Your iPhone's capacity and your iCloud capacity are separate. Check both before changing the photo setting.

Storage	Where to check
iPhone	Settings > General > iPhone Storage
iCloud	Settings > your name > iCloud

In iPhone Storage, look at how much space Photos uses. Apple's storage guide explains both storage views and the separate role of iCloud capacity.

If Photos is not a major local storage user, photo optimization may not address the main reason your phone is full.

If you see iCloud storage is full, resolve that capacity problem first. It can pause photo syncing, according to Apple's sync-status guide. Optimizing the phone does not increase your iCloud storage allowance.

2. Select the optimize option

1. Open Settings, tap your name, then iCloud > Photos.
2. Confirm that you are using the Apple Account whose photo library you intend to sync.
3. Turn on Sync this iPhone if it is off.
4. In iOS 27, tap iPhone Storage, then select the Optimize Storage option.
5. In iOS 26, choose the optimize option directly on the Photos settings page.

Apple's current photo-storage instructions call it Optimize iPhone Storage; its setup guide uses Optimize Storage and documents the version-specific path.

If the option is already selected, leave it selected and check the library status next. Repeatedly changing it is not a success check.

3. Let the photo library finish syncing

Open Photos > Collections, then tap the profile button in the upper corner. Read the library status below your name and photo count.

For syncing problems, Apple recommends connecting the phone to power and Wi-Fi and letting it sync uninterrupted overnight. A large library can take longer; this is not a promise that every upload or storage change will finish overnight. Follow the message shown in Photos.

Status or condition	What to check
Low battery	Charge the iPhone
Low Power Mode or Low Data Mode	Follow the status guidance and review that setting
Poor network connection	Check the connection and allow syncing to resume
iCloud storage is full	Review cloud capacity before expecting more uploads

These branches come from Apple's library-status instructions. Apple specifically advises against turning iCloud Photos off to troubleshoot syncing, because doing so restarts the process.

4. Check the result without expecting zero photo storage

Return to the same settings and confirm:

• iCloud Photos syncing is on for the intended account.
• The optimize option remains selected.
• Photos does not show an unresolved upload or capacity problem.
• Your expected photos and videos remain available in the library.

You can also check recent and older items at iCloud.com/photos using the same Apple Account. Apple's download guide explains how to find the library there. Spot checks are useful, but they are not proof that you have a separate backup.

Note the local Photos usage in Settings > General > iPhone Storage and compare it later. Apple says optimization happens when the device needs space, starting with less-accessed items. Photos still uses device storage, so the target is not zero local usage. See how Optimize Storage works.

Example: a nearly full phone with room in iCloud

This is an illustrative situation and expected result, not an iPhone test.

Suppose Photos is a large category on your nearly full iPhone, your iCloud account has room for the library, and Photos still reports uploads in progress.

The next action is to confirm optimization and let syncing progress. Do not delete photos just to force a smaller local-storage number.

Check afterward	Expected result
Photo-storage setting	Optimize option selected
Library status	No unresolved sync problem
Library contents	Expected photos and videos remain available
Local Photos usage	Can remain above zero and change as needed

If iCloud instead reports that it is full, the example's starting condition is not met. Address the cloud-capacity problem before expecting the remaining originals to upload. There is no fixed number of gigabytes this example guarantees to recover.

Keep a separate copy of important photos

Deleting a photo in a synced library deletes it from the other devices using iCloud Photos too. It is not a way to remove only the iPhone's local copy.

Apple also says iCloud Photos items are not duplicated in the device's iCloud Backup. Keep separate copies of important originals using Apple's download and export instructions. Check the saved copies before relying on them.

If storage remains tight after the sync issues are resolved, review the other categories in iPhone Storage. Keep this photo workflow focused on optimization rather than deleting synchronized originals.