How to Clear the Cache on iPhone (Safari and Apps)
Quick answer: for Safari, go to Settings > Safari > Clear History and Website Data. For an app there is no magic button: open Settings > General > iPhone Storage, tap the app and use Offload App. And be skeptical of tools that promise to wipe everything in one tap, iOS simply does not allow it.
Clear the Safari cache
This is the cache that grows fastest, because you browse every day. Open Settings > Safari, scroll to Clear History and Website Data and confirm. Safari drops cached pages and cookies. You stay signed in to iCloud, but some sites will ask for your password again, that is expected.
If you want to keep your history and only drop site data, use Settings > Safari > Advanced > Website Data > Remove All Website Data.
Clear an app's cache
Plenty of apps (social, messaging, streaming) sit on hundreds of megabytes of cache. iOS has no dedicated button, but two methods work.
Offload instead of delete
In Settings > General > iPhone Storage, tap the app. You see two numbers: the app size and its Documents & Data (the cache). Offload App removes the app but keeps your settings and files, and reinstalling brings it all back. For a deeper reset, Delete App then reinstall from the App Store starts fresh.
The app's own setting
Some apps ship their own control. WhatsApp for example: Settings > Storage and Data > Manage Storage to clear received photos and videos, which often weigh more than the app itself.
The hidden cache: System Data
After the cleanup, the System Data bucket (formerly "Other") sometimes stays large. It is a mix of caches, logs and temporary files that iOS manages on its own. A restart and a cleared Safari cache usually shrink it. We break it down in our guide to iPhone System Data.
Watch out for 'cache cleaner' apps
On the App Store, some apps promise to wipe all your cache and flash a big "GB to clean" counter. On iOS that is technically impossible: every app is sandboxed. That counter is marketing, not a real measurement. An honest tool does not invent numbers, it just helps you sort what you can actually delete, like duplicate photos.
| Cache | Where to clear it | What you get back |
|---|---|---|
| Safari | Settings > Safari > Clear History | Often the biggest |
| App (generic) | Settings > General > Storage > Offload | Varies, sometimes high |
| WhatsApp / Messages | The app's own storage setting | High if lots of media |
| System Data | Restart, self-managed | Low to medium |
FAQ
Does clearing the cache actually speed up my iPhone?
A little, mostly Safari when it lags or crashes. iOS uses the cache to reload things you visit often, so it rebuilds itself. Clearing it daily gains you nothing.
Why is there no 'clear cache' button inside an app?
iOS does not give apps direct access to each other's cache. The real lever is Offload App in Settings > General > iPhone Storage, which drops the app and its cache but keeps your data.
Can a cleaner app clear all my cache at once?
No, and it is a red flag when one claims to. iOS sandboxes every app's cache, so no third-party app can reach it. The 'GB to clean' it shows is usually inflated to impress you.
