How iOS optimizes storage
If your device is low on storage, iOS automatically optimizes its available space while installing an app, updating iOS, downloading music, recording videos, and more.
To create more storage, iOS can remove some of your items, like streamed music and videos, files in iCloud Drive, and parts of apps that aren't needed. It also removes temporary files and clears the cache on your device. iOS only removes items that can be downloaded again or that aren't needed anymore.
Use your iOS device to check its storage
Go to Settings > General > [Device] Storage. You might see a list of recommendations for optimizing your device's storage, followed by a list of installed apps and the amount of storage each one uses. Tap an app's name for more information about its storage. Cached data and temporary data might not be counted as usage.
Depending on the app, you might be able to delete some of its content, or delete the app and all of its content. You can also offload the app, which frees up storage used by the app, but keeps its documents and data on your device.
If your device is almost full and iOS can't free up space on your device, you might get a Storage Almost Full alert. If you see this alert, you'll need to remove some less-used content like videos and apps.
Use recommendations to optimize storage
In the Storage section of Settings, iOS might offer recommendations for optimizing your device's storage. Tap Show All to see all the recommendations for your device.
Read the description of each recommendation, then tap Enable to turn it on.
Use iTunes to check the storage on your iOS device
- Open iTunes on your computer.
- Connect your device to your computer.
- Select your device in iTunes. You'll see a bar that shows how much storage your iOS content uses, divided by content type.
- Move your mouse over a content type, like Other or Apps, to find more information:
Here's a list of the types of content on your iOS device, and what each type includes:
- Audio: Songs, audio podcasts, audiobooks, voice memos, and ringtones.
- Video: Movies, music videos, and TV shows.
- Photos: Content in your Photo Library, Camera Roll, and Photo Stream.
- Apps: Installed apps. The content of the apps is listed under Documents & Data.
- Books: iBooks books, audio books, and PDF files.
- Documents & Data: Safari Offline Reading List, files stored within installed apps, and app content like contacts, calendars, messages, and emails (and their attachments).
- Other: Settings, Siri voices, system data, and cached files.
About cached files in "Other" iOS storage
Cached files are created when you stream or view content like music, videos, and photos. When you stream music or video, that content is stored as cached files on your iOS device so you can quickly access it again. iTunes categorizes cached music, videos, and photos as Other instead of actual songs, videos, or photos.
Your iOS device automatically removes cached files and temporary files when your device needs more space.
If storage on an iOS device differs from what you see in iTunes
Since iTunes categorizes cached files as Other, reported usage for Music or Videos might differ. To view usage on your iOS device, go to Settings > General > [Device] Storage.
If you want to delete the cached files from your iOS device
Your iOS device automatically deletes cached files and temporary files when it needs more space. You don't need to delete them yourself.
- To reduce the size of your Photo library, turn on iCloud Photo Library and optimize your device storage.
- Optimize your music and videos storage in Settings > Music > Optimize Storage.
- Learn how macOS and iOS report storage capacity.