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iPhone Storage Full? What's Taking Up Space and What to Delete First

Updated October 30, 2026 · Written for iOS 26

"iPhone Storage Full" usually shows up at the worst time, like when you're about to film something. The good news is that on most phones, one or two things take up most of the space, and you can find them in a minute.

Step 1: See what is actually using the space

Open Settings > General > iPhone Storage. Give it a few seconds to finish loading. The colored bar at the top shows the big categories, and the list below shows every app sorted by size.

On most iPhones, the top of that list looks like this:

• Photos, often 30 to 70 percent of everything
• Messages, because every photo and video anyone ever sent you is stored there too
• A few apps that keep large offline files, like Netflix, Spotify, Google Maps or games
• System Data, which you can only partly control (more on that below)

Write down the top three. That's where your time should go.

Step 2: If Photos is at the top, start with videos

A single minute of 4K video can take several hundred megabytes. A photo is usually 2 to 5 MB. So one long video can weigh as much as a hundred photos.

In the Photos app, go to Collections, scroll to Media Types and tap Videos. Look for long clips you don't need, like screen recordings, accidental pocket videos and concerts you never watched again. Deleting ten big videos often frees more space than deleting a thousand photos.

Step 3: Clear out duplicates and near-duplicates

iOS has a built-in Duplicates album. Open Photos, go to Collections, scroll to Utilities and tap Duplicates. It finds exact copies, like the same photo saved twice from WhatsApp, and lets you merge them.

What it doesn't catch is the much more common case: eight shots of the same moment taken seconds apart, all slightly different. Those are the real space eaters for most people. Our guide on deleting similar photos shows how to deal with them.

Step 4: Screenshots

Go to Collections > Media Types > Screenshots. Most people have hundreds. Tap Select, drag your finger across rows to pick many at once, and delete what you no longer need.

Step 5: Messages attachments

Go back to Settings > General > iPhone Storage > Messages. Tap Review Large Attachments to see the biggest files people have sent you, sorted by size. Swipe left on anything you don't need.

You can also tell Messages to stop keeping everything forever: Settings > Apps > Messages > Keep Messages, then choose 1 Year. Be careful, because this deletes older conversations.

Step 6: Empty Recently Deleted

This is the step everyone forgets. When you delete photos, iOS keeps them in Recently Deleted for 30 days. The space doesn't come back until that album is emptied.

Open Photos, go to Collections > Utilities > Recently Deleted, unlock it with Face ID, tap Select, then Delete All.

What about System Data?

System Data is caches, logs and temporary files that iOS manages itself. No app can clear it for you, whatever its App Store page says. A restart sometimes shrinks it. Our System Data guide covers what else works.

What not to do

• Don't pay for a "phone cleaner" that charges by the week. Many of them cost around $8 a week after a short trial. That's over $400 a year for things you can mostly do yourself.
• Don't delete apps you use just to make room. Use Offload App instead (tap the app in iPhone Storage). It removes the app but keeps your data, and reinstalls in seconds.
• Don't turn off iCloud Photos without thinking. If Optimize iPhone Storage is on, your full photos live in iCloud and the phone keeps smaller versions. That setting saves a lot of space already.

The short version

Videos first, then similar shots, then screenshots, then message attachments, then empty Recently Deleted. On a typical full iPhone, that order gets back 10 to 30 GB in under half an hour.