Where iPhone stores app data and why you might need to clear it
Every app on your iPhone stores two kinds of information: the app itself (which takes up storage space) and the data it collects while you use it (login details, cached images, saved preferences, game progress). When you delete an app normally, you remove the program but often leave the data behind. That leftover data can add up to gigabytes of storage, slow down a fresh install of the same app, or contain information you no longer want on your phone.
App data lives in a hidden folder on your iPhone that you cannot access directly through the Files app. Instead, you delete it through Settings, either by removing the app entirely or by clearing its cache and temporary files while keeping the app itself. The method you choose depends on whether you want to keep using the app or remove it completely.
Key Takeaways
- Deleting an app from your home screen does not remove its data — you must use Settings to fully remove both the app and its stored information.
- Offloading an app removes the program but keeps your data, so reinstalling it later restores your login details and preferences.
- Clearing an app's cache frees storage space without erasing login information or saved settings, and is safe to do anytime.
- Some apps let you clear their cache directly within the app's own settings, which is faster than going through iPhone Settings.
Fully deleting an app and all its data
To remove an app completely along with everything it stored, open Settings and tap General, then iPhone Storage. Scroll down and find the app you want to delete. Tap it, then tap Delete App. A confirmation screen will ask if you want to Delete App or Offload App — choose Delete App. This removes both the program and all its associated data, cache, and login information.
If you delete an app this way and reinstall it later, you will start fresh with no saved passwords, game progress, or preferences. Some apps will ask you to log back in when ready. Others will let you sign in and restore your data from their own servers (like Gmail or Slack do), but not all apps work this way.
Alternatively, you can press and hold the app icon on your home screen, tap Remove App, then choose Remove from Home Screen or Remove App. If you choose Remove App, you will see the same Delete App versus Offload App choice. This method works the same way as going through Settings.
Offloading an app to keep your data
Offloading removes the app program itself but preserves all the data it stored — your login details, preferences, game saves, and cached files. When you reinstall the app later, it will remember everything exactly as you left it. This is useful if you need storage space but plan to use the app again soon.
To offload an app, go to Settings, tap General, then iPhone Storage. Find the app and tap it. Choose Offload App, then confirm. The app icon will remain on your home screen with a small cloud icon, showing it is installed but not active. Tap the icon to reinstall it, or go back to Settings and tap Reinstall App.
Offloading works best for apps you use occasionally but want to keep configured. If you offload a social media app, for example, you will not receive notifications while it is offloaded, but your account settings and preferences will be waiting when you reinstall it.
Clearing cache and temporary files without removing the app
Cache is temporary data that apps read to load faster next time — images, web pages, search results. Clearing cache frees storage space without erasing your login information or saved settings. Most apps rebuild their cache automatically the next time you use them, so clearing it is safe and has no downside.
Not all apps let you clear cache from iPhone Settings. Go to Settings, tap General, then iPhone Storage and find the app. If you see a Documents & Data number listed, that includes cache. Tap the app and look for an option to Offload App or Delete App — there is no separate "clear cache" button in Settings for most apps. Some apps, like Instagram, Photos, or Mail, do not show a cache-clearing option in Settings at all.
For those apps, check inside the app itself. Open the app, go to its settings or preferences (usually a gear icon or your profile picture), and look for options like Clear Cache, Clear Data, or Storage. Mail, for example, lets you delete old attachments and cached messages from within the Mail settings. Spotify lets you clear cache from Spotify Settings under Storage. Checking the app first is often faster than going through iPhone Settings.
What happens to app data when you update an app
Updating an app through the App Store does not delete your data. The app program gets newer code, but your login information, preferences, and saved files stay exactly as they were. Updates are safe and will not erase anything you have stored in the app.
The only exception is if an app's update includes a major change that requires you to set it up again — this is rare and the app will usually warn you before the update. In general, you can update apps without worrying about losing your data.
Recovering storage space from apps you no longer use
If you have apps installed that you have not opened in months, they are taking up storage space for no reason. Go to Settings, tap General, then iPhone Storage. The list shows apps sorted by size, with the largest at the top. Apps you have not used recently appear lower in the list but still take up space.
Scroll through and identify apps you genuinely do not use. For each one, decide: do you think you will use it again? If yes, tap it and choose Offload App to save space while keeping your data. If no, choose Delete App to remove it completely. This is the fastest way to free up several gigabytes if your phone is running low on storage.
After deleting or offloading apps, go back to iPhone Storage and check the Available space number at the top. It should increase. If you still need more space, repeat the process with other apps, or look for large video files or photo libraries to delete separately.
Frequently Asked Questions
Will deleting an app remove my login information?
Yes, if you choose Delete App in Settings, all stored login details are removed. If you choose Offload App instead, your login information stays on your phone and the app will remember you when you reinstall it. If the app backs up your data to its own servers (like Gmail or Slack), you can log back in after deleting and restore your information that way.
Can I clear cache for multiple apps at once?
No, iPhone Settings does not have a bulk cache-clearing option. You must go through each app individually. Some third-party apps claim to clear cache for multiple apps, but Apple does not recommend them and they cannot access cache the way Settings can. Clearing cache one app at a time through Settings or the app itself is the reliable method.
What is the difference between Documents & Data and cache?
Documents & Data is the total size of everything an app has stored, including cache, temporary files, and actual documents you have saved in the app. Cache is just the temporary files. When you see a Documents & Data number in iPhone Storage, it includes both. Clearing cache reduces that number, but not all of it.
If I offload an app, will I still get notifications?
No, offloaded apps cannot send notifications because they are not running. You will not receive messages, alerts, or reminders from an offloaded app until you reinstall it. If you need notifications from an app, keep it installed rather than offloading it.
Does clearing cache make my iPhone faster?
Clearing cache frees storage space, which can help if your phone is nearly full, but it does not noticeably speed up your iPhone otherwise. Cache actually helps apps load faster, so clearing it might make an app slightly slower the first time you use it after clearing. Clear cache only if you need storage space, not for performance reasons.