Deleting your app data with this method deletes that data from the current phone or tablet, iCloud, and any other devices you used to sync to the same iCloud account. You can delete data from most Apple apps this way, as well as a few third-party apps. See this method if you want to delete your Safari browsing data.
If you don’t see the app you are looking for here, you’ll need to delete the app data by deleting the app itself. You can reinstall the app afterwards to start with a clean slate.
If you delete the data from the Messages app, all of current iMessage conversations will be deleted. Deleting the data from iCloud Drive app will delete any files stored in your iCloud Drive.
If you don’t want the app to store data in iCloud anymore, tap the back button until you’ve returned to the iCloud screen, and then tap the switch next to an app to turn it off.
If you want to delete all of the information that an app has saved on your iPhone or iPad, deleting the app will do the trick. You can reinstall the app again if you’d like, which would give you a fresh start. This won’t work for most Apple apps that come preinstalled on your iPhone or iPad, as they typically cannot be deleted. [1] X Research source
The amount of space an app is using is listed to the right of the app. Look for apps that use the most amount of space that you are no longer using.
If the Documents & Data size seems large, deleting the app and reinstalling it will free up space on your phone or tablet. If the App Size is what’s large, deleting and reinstalling won’t free up much space.
If you want to delete the app but not the data, you can tap Offload App. This saves the documents and data related to the app, in case you want to install it again with your saved information. Some apps, such as Spotify, save a lot of data because of the content you download in the app. You can always go into the app itself and disable any features that download data to conserve space rather than downloading and re-installing the app.
Use this method to delete your Safari web browsing data, including your cache, history, and cookies. This can free up space on your phone, tablet, and in iCloud.