iPhone storage full? How to free up space (and make room for iOS 27)

Why is my iPhone storage full after the iOS 27 update?

Apple Intelligence comes with iOS 27 on supported iPhones and needs up to 8 GB of storage, or up to 14 GB on iPhone 17 Pro, iPhone 17 Pro Max and iPhone Air, so a phone that was nearly full before the update can run out right after it. Open Settings, General, iPhone Storage to see what grew; if it's photos and videos, the steps below get the space back.

The “iPhone Storage Almost Full” alert has a habit of showing up when you're trying to record something, install an app, or update iOS. This guide covers both jobs: getting space back today, and making enough room for the iOS 27 update that Apple released on September 14, 2026.

The steps run roughly from biggest win to smallest. You won't need all of them.

Not enough storage to update to iOS 27

This is the version of the problem most people are hitting right now. You tap Software Update and iOS says there isn't enough space.

How much free space you need

Apple doesn't publish a single number. The Mac Observer points out that the only figure you'll see is the one your own phone shows during the update, and it varies by model and by the version you're coming from.

Third-party update guides land in the same range. Digitbin suggests 15 to 20 GB free, and Tenorshare suggests 20 to 25 GB. These are estimates, not Apple figures. The gap exists because the download is only part of it: iOS unpacks and verifies the update and briefly keeps old and new system files side by side. In an Apple Community thread about the iOS 26.6 update, one user saw a roughly 6 GB download take about 25 GB while it was being prepared. That space comes back after the install.

A practical target: about 20 GB free before you start.

Let iOS remove apps for you

You may not have to clear anything by hand. Apple's update support page says that when you update wirelessly and the software needs more space, a message can ask to temporarily remove apps. Tap Continue and iOS removes them, then reinstalls them automatically once the installation is complete. Tap Cancel and you're back to freeing space yourself.

It's the quickest way through the update. It doesn't leave you any headroom afterwards, though, so the phone will be full again the day you shoot a long video.

Offload vs delete

Both options sit under Settings > General > iPhone Storage: tap any app to see them. Apple's storage guide describes the difference:

• Offload App frees the storage the app itself uses but keeps its documents and data. The icon stays on your Home Screen with a cloud symbol, and tapping it reinstalls the app.
• Delete App removes the app and its data. Anything the app stored in iCloud stays in iCloud.

Offload apps you'll want back. Delete the ones you won't. Offloading keeps an app's data, so for streaming apps and games heavy with downloads, clear those downloads inside the app too.

Why photos and videos are the fastest space to free

Offloading apps works, but you trade away apps you might want and often get back less than you hoped. Video is a different scale: a minute of 4K at 60 fps is roughly 400 MB. A handful of long clips you've already shared or backed up can cover most of an update on their own. Photos add up the same way through volume: burst shots, ten versions of the same group photo, and years of screenshots.

One catch: deleted photos move to Recently Deleted and keep using space for 30 days. Empty that collection before you retry the update (step 4 below).

Apple Intelligence needs its own room

If you use Apple Intelligence, plan for it too. Apple's support page for the iOS 27 version says it needs up to 14 GB on iPhone 17 Pro, iPhone 17 Pro Max and iPhone Air, and up to 8 GB on other iPhones that support it. 9to5Mac reports the 14 GB figure also applies to the iPhone 18 Pro models.

That space belongs to the system. No cleaner app can shrink it, including ours, so count it when you work out how much room you need.

Step 1: See what's using your storage

Go to Settings > General > iPhone Storage. The bar at the top breaks usage into categories, and the list below sorts every app by size. Give it a minute on a big library; the numbers fill in as iOS calculates.

If Photos is the biggest bar, steps 2 to 4 matter most. If it's System Data, our guide to why iPhone storage stays full after deleting photos covers what's in there and what you can do about it.

Step 2: Clear duplicates, similar shots and screenshots

Start with Apple's built-in tool. In Photos, tap Collections, then Utilities, then Duplicates, and tap Merge on each set. It only catches exact copies. The near-identical shots, like five takes of the same pose, stay behind; our guide to deleting duplicate photos on iPhone covers both. If the Duplicates collection is missing, here's why.

iOS 27 also added a Captured by Me collection in Utilities that shows only photos and videos taken with the Camera app. It's a quick way to see how much of your library is everything else: screenshots, saved images and media from chats. Screenshots and blurry photos are usually the easiest deletes you'll make.

Step 3: Deal with your biggest videos

In Photos, tap Collections, scroll down to Media Types and open Videos. Long clips from trips, concerts and school events are where gigabytes hide. Delete what you've already shared or backed up. For clips you want to keep, compressing them shrinks the file while keeping it watchable on a phone.

Step 4: Empty Recently Deleted

Everything you delete in Photos sits in Recently Deleted for 30 days and still takes up space. In Photos, tap Collections, open Recently Deleted below Utilities, and authenticate with Face ID, Touch ID or your passcode. Tap Select, choose the items, and delete them. Messages keeps its own Recently Deleted folder for 30 days as well.

Don't worry if the number doesn't move straight away. It can take a while for storage to update, and a restart speeds it up. More on this in do photos in Recently Deleted take up storage.

Step 5: Clear Messages attachments

Years of videos and photos from group chats live inside Messages. Open a conversation, tap the contact or group icon at the top, pick a category such as Photos, then tap Edit and Select to remove attachments in bulk.

To stop the pile-up, go to Settings > Apps > Messages > Keep Messages and choose a shorter period than Forever. Be sure first: older conversations and their attachments are removed automatically after that.

Step 6: Stop chat apps saving to your library

WhatsApp, Telegram and Signal can save every photo and video you receive straight into Photos. Look in each app's chat or storage settings for the option that saves incoming media and turn it off. It won't remove what's already there, but it stops the library from refilling.

Step 7: Offload unused apps automatically

Go to Settings > Apps > App Store and turn on Offload Unused Apps. When storage runs low, iOS removes apps you don't use and keeps their data, with the icon left in place for a one-tap reinstall.

Step 8: Turn on Optimize Storage for iCloud Photos

If you use iCloud Photos, your iPhone can keep smaller versions of photos and videos while the originals stay in iCloud. In iOS 27, go to Settings, tap your name, then iCloud, tap Photos under Saved to iCloud, tap iPhone Storage, and choose Optimize Storage. Apple's iCloud Photos guide has the details.

This needs enough iCloud storage for the whole library, so clean it up first. There's no point paying to store duplicates twice over.

Step 9: Remove downloads you've finished with

Downloaded episodes in streaming apps, offline music, podcasts and big files in the Files app all count. Check the largest apps in the iPhone Storage list and clear their downloads from inside each app.

The old Shared Albums trick doesn't work on iOS 27

This guide used to recommend moving screenshots into a Shared Album, because Shared Albums didn't count against iCloud storage. That changed. MacRumors reports that Shared Albums created in iOS 27 keep photos at full resolution and count against the owner's iCloud storage, including items other people add. Albums you already had keep the old behaviour unless you pick the Upgrade Shared Album option. There's also a temporary shared album that doesn't use storage but deletes its unsaved content after 30 days.

If you own busy family albums, don't upgrade them without checking your iCloud plan first.

Where LuminaClean fits

Steps 2 to 4 are the slow part, because picking photos by hand through a big library takes hours. LuminaClean scans your library on-device and groups exact duplicates, near-duplicate shots, blurry photos, screenshots and large videos. You can filter by file size, work through one year at a time with Flashback, and compress videos for free. If you want to keep one moment from a long video, the free Live Wallpaper tool saves a 2-second clip of it as a Live Photo you can set on your Lock Screen. You approve every deletion with a swipe, and each one lands in iOS Recently Deleted first.

It only works on your photo library. It can't manage Shared Albums, clear System Data, shrink Apple Intelligence, or change iCloud settings. The free tier gives you 65 free deletes to start, then +30 every day, with full detection and no account. An optional Premium subscription removes the limit for a big one-off cleanup. If your library is so large that Photos freezes, read our guide to a Photos library that's too big first.

Related guides

• Why Is My iPhone Storage Still Full After Deleting Photos? — System Data, caches and the rest.
• Do Photos in Recently Deleted Take Up Storage? — the 30-day hold explained.
• How to Delete Duplicate Photos on iPhone — exact and near-duplicates.
• Best iPhone Photo Cleaner Without a Subscription — free and free-to-start options compared.

Frequently asked questions

How much free space do I need to update to iOS 27?

Apple doesn't publish one figure, because it depends on your model and the version you're updating from. Third-party update guides suggest keeping roughly 15 to 25 GB free, since iOS needs working room on top of the download itself. About 20 GB free is a safe target.

Can I update to iOS 27 without deleting anything?

Often, yes. When you update wirelessly and space is short, iOS can ask to temporarily remove apps. Apple says to tap Continue, and the apps are reinstalled automatically once the installation finishes. If you tap Cancel, you'll need to free space yourself.

How much storage does Apple Intelligence need in iOS 27?

Apple's support page says up to 14 GB on iPhone 17 Pro, iPhone 17 Pro Max and iPhone Air, and up to 8 GB on other iPhones that support Apple Intelligence. 9to5Mac reports the 14 GB figure also covers the iPhone 18 Pro models.

Why is my iPhone storage full?

On most iPhones, photos and videos are the largest category, followed by apps, Messages attachments and System Data. Go to Settings, General, iPhone Storage to see the breakdown for your phone before you delete anything.

Does offloading an app delete my data?

No. Apple says offloading frees the storage the app uses but keeps its documents and data. The icon stays on your Home Screen with a cloud symbol, and tapping it reinstalls the app. Deleting an app removes the app and its data.

Why is my iPhone storage still full after deleting photos?

Deleted photos and videos stay in the Recently Deleted collection for 30 days and keep using space until then. In Photos, tap Collections, open Recently Deleted below Utilities, authenticate, then select and delete the items. The storage figure can take a few minutes to update.

Do Shared Albums still save iCloud storage in iOS 27?

Not for new ones. MacRumors reports that Shared Albums created in iOS 27 store full-resolution photos and count against the owner's iCloud storage, including items other people add. Existing albums keep the old behaviour unless you upgrade them.