How to Free Up Storage on iPhone

The warning arrives at the worst moment — “iPhone Storage Full” just as you try to take a photo, or an update that refuses to install for lack of room. The fix is rarely to delete everything in sight: this guide walks through the iPhone Storage screen, works out what is actually eating the space, and frees enough room to take photos and install updates again — without losing anything you want to keep.

Before you start

You need your iPhone, unlocked, with your passcode or Face ID or Touch ID, and a few minutes. If you plan to delete photos or videos, check first that anything you want to keep is backed up or saved somewhere else.

Steps

Open iPhone Storage. Open Settings, tap General, then tap iPhone Storage. Wait a moment while the phone calculates what is using space.
Review the recommendations. At the top of the screen, your iPhone lists recommendations, such as reviewing large attachments or offloading unused apps. Work through them one at a time.
Offload unused apps. Turn on Offload Unused Apps, or tap Enable next to it. This removes apps you rarely use but keeps their documents and data, so you can reinstall an app later without losing its data.
Review large attachments and photos. Tap Review Large Attachments to see large files sent in Messages, and delete ones you no longer need. Then check Photos for large videos and duplicates you can delete.
Delete what you no longer need. Remove apps you no longer use, old downloads, and large files you have already saved elsewhere. Empty the Recently Deleted album in Photos afterward, or the space will not be freed until those items expire.

What to check

Go back to Settings > General > iPhone Storage and check that the available space has increased. Try the thing that was failing before, such as taking a photo or installing an update, and confirm it works. If storage is still full, repeat the review step — large videos and old message attachments are usually the biggest items.

Keeping storage under control

Freeing up iPhone storage is mostly a review job: check what is using space, offload the apps you rarely open, and clear the large attachments you no longer need. Run the same check whenever the warning comes back, before it gets far enough to block a photo or an update.

Check what is using storage first

Before you delete anything, open Settings > General > iPhone Storage and wait for the phone to calculate usage. The list shows which apps, photos, messages, and system data take the most space, so you can start with the biggest items instead of guessing.

Back up photos before deleting: if a photo or video matters to you, check first that it is backed up or saved somewhere else. Deleted photos go to the Recently Deleted album and are only gone for good once that album is emptied or the items expire, so emptying it is the step that actually frees the space.

What ‘System Data’ and ‘Other’ mean

In the coloured bar at the top of the iPhone Storage screen, ‘System Data’ — shown as ‘Other’ on older iOS versions — is the catch-all for files that do not belong to a named app: cached files, message attachments, browser data, Siri voices, logs and update files. It is not one thing you can open and tidy, and its size goes up and down on its own as the phone works.

Do not try to delete System Data directly: there is no button for it. It usually shrinks on its own when you delete old message attachments, clear Safari website data, or restart the phone. The same caution applies to anything you delete to make room: do not remove photos, videos or conversations until you have checked they are backed up somewhere else — once they are gone from the phone and from Recently Deleted, they are gone for good.

Related guides: browse all Apple & iOS guides, or read How to Clear App Cache on Android.

Storage freed and the warning gone? The habit that keeps it that way is a quick look at the iPhone Storage screen now and then, before the phone forces the issue — it beats deleting in a panic when a photo will not save. For more iPhone, iPad and Mac guides, see the and the Apple & iOS guides.