How to Clear Cache on iPhone: Safari, Chrome, and Apps
Clear cache on iPhone in Safari, Chrome, and apps like Spotify and TikTok. There is no single button, and each route removes something different.
System Data & cache
System Data & cache
iPhone System Data Huge? What It Is and How to Reduce It
System Data on iPhone is the storage category for the system's own working files: caches, logs, Siri voices, fonts and the Spotlight search index. You cannot delete it directly. Part of it is caches that iOS removes by itself when space runs short, and a few Settings changes clear caches and app data.
It appears near the bottom of the app list in Settings > General > iPhone Storage, the same screen used to check iPhone storage. Apple's own guide to iPhone storage describes the same space under an older name, Other.
What System Data Is on iPhone Storage
What is System Data on iPhone storage?
System Data on iPhone storage is the space iOS uses for its own working files, separate from the operating system and from your apps. It holds caches, logs, system assets and indexes. No single control removes it, and its size changes as caches are created and removed.
Apple's storage guide lists what the category holds:
- Mobile assets you cannot remove, including Siri voices, fonts and dictionaries
- Logs and caches you cannot remove
- The Spotlight index, which on-device search relies on
- System data, including the Keychain and the CloudKit Database
The voices, fonts, Keychain and index are working parts of the phone, not clutter. Cached and temporary files are the part that grows and shrinks.
System Data, iOS and Apps: Which Line Is Which
Three lines in iPhone Storage are easy to mix up, and Apple's support article names two of them differently from the iPhone screen. Macworld's explainer on iPhone storage notes that Other was renamed System Data in iOS 15.
| Line on the iPhone Storage screen | Name in Apple's storage guide | What it holds | Can you shrink it? |
|---|---|---|---|
| iOS | System | The operating system, whose size varies by device and model | Not with any option Apple's guide lists |
| System Data | Other | Caches, logs, Siri voices, fonts, dictionaries, the Spotlight index, Keychain and CloudKit data | Partly, as caches are removed |
| Each app in the list | Listed app by app | The app with its documents and data | Yes, by offloading or deleting the app |
Which line is large decides where to start. A large total across the app list points at the apps themselves, which Applications in iPhone storage covers. A large System Data figure points at the one part of it that moves: the caches.
Why iPhone System Data Gets So Large
Why is my iPhone System Data so high?
Your iPhone System Data is so high because cached and temporary files build up as you stream and view content. Apple says the system creates cached files when you stream or view content, so that content opens faster next time. Logs and system assets sit underneath as a base.
Apple adds two points that change how to read the figure. Cached and temporary data may not count as usage, and the device removes those files by itself when it needs more space.
Apple's storage guide gives no normal size for System Data. A large number on its own is therefore not a fault. The useful question is what the figure does once storage gets tight.
When a Large System Data Figure Needs Action
Whether to act depends on how much storage is free and on what System Data does next.
| What you see | What it means | What to do |
|---|---|---|
| System Data is large, and plenty of storage is free | iOS has room for its caches, so it has no need to remove them | Nothing |
| Storage is nearly full, and System Data falls once you free some space | iOS is removing cached files as it needs the room | Free more space in photos, videos or apps |
| Storage is nearly full, and System Data stays large | Removing caches has not given back enough space | Work through the Settings changes for System Data |
Only a full phone whose System Data will not come down calls for more than leaving iOS to manage its caches.
How to Reduce iPhone System Data
You cannot delete System Data on iPhone directly, because iOS has no button or setting for it. Apple's own settings act on caches and app data instead:
- Clear Safari history and website data. In Settings > Apps > Safari, tap Clear History and Website Data, confirm the timeframe and tap Clear History. To keep your history, use Advanced > Website Data > Remove All Website Data, as Apple's Safari guide describes.
- Offload apps you rarely use. In iPhone Storage, choose an app and tap Offload App. Apple says this frees the storage the app uses but keeps its documents and data.
- Turn on storage recommendations. The same Storage screen may suggest ways to save space. Tap Show to see them all, read each description, then tap Enable on the ones you want.
- Keep iOS up to date, using Apple's steps to update iOS.
Offloading has one cost. The app itself is removed, so it has to download again before you next open it, with its documents and data still in place.
Some apps also carry their own option to clear the cache on iPhone, which removes that app's cached files without offloading it. Erasing the iPhone and restoring a backup is the step to keep for last when clearing iPhone System Data. Apple does not present it as a System Data fix, and it is only safe once a complete backup exists.
Why Cleaner Apps Cannot Clear System Data
No App Store app can open or delete System Data. Apple's platform security guide states that all third-party apps are sandboxed. The sandbox is designed to stop an app from gathering or modifying information stored by other apps, or from making changes to the device.
System Data belongs to iOS itself, so an app sold as a System Data cleaner has no route to it. A cleaner app can only work on what you grant it access to. Knowing what iPhone cleaner apps can safely do saves installing one for a job iOS does not allow.
Where Space Actually Comes Back: Photos, Videos and Apps
Photos, videos and apps are the storage categories under your control. Every step to free up space on iPhone works on them, and they are the first place to look when iPhone storage is full.
Photo cleaner apps work inside the camera roll rather than on system files. Apps such as Swipe Quick show one photo at a time, on the device: swipe left to delete, right to keep. Deleted photos go to Recently Deleted in the Photos app for 30 days, so a mistake can still be recovered.
Frequently asked questions
What does a Mac show for an iPhone's System Data?
A Mac shows an iPhone's System Data inside a category called Other, in Finder or the Apple Devices app. Apple's storage guide describes that category as settings, Siri voices, system data and cached files.
Does clearing Safari history delete AutoFill?
Clearing Safari history does not delete AutoFill. Apple's Safari guide states that clearing your history, cookies and cache leaves your AutoFill information unchanged.
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