What cache and data actually do on your iPhone
Cache is temporary information your apps store to load faster next time — things like images from websites you visited, login details you've seen before, or parts of videos you watched. Data is the permanent stuff your apps keep: your messages, photos, saved passwords, settings you chose, game progress. When you clear cache, apps reload slower for a bit but nothing you created disappears. When you clear data, you erase everything the app stored, including settings and saved information.
Most people clear cache to free up storage space or fix an app that's acting broken. You almost never need to clear data unless an app is seriously malfunctioning or you want to start completely fresh with it. iPhone doesn't let you clear just one app's cache from Settings — you clear it all at once, or you delete and reinstall the app instead.
Key Takeaways
- Cache is temporary files apps store to load faster; clearing it frees space but doesn't erase anything you created.
- Data is permanent information like messages, photos, and settings; clearing it erases everything the app stored.
- iPhone's Settings app clears cache for Safari only — to clear cache for other apps, delete and reinstall them.
- Clearing Safari cache and data takes two minutes and is the safest way to free space without losing important information.
- If an app is frozen or crashing, force-closing it usually fixes the problem before you need to clear anything.
Clear Safari cache and data through Settings
This is the main way to clear cache on iPhone. Open Settings, scroll down and tap Safari, then scroll to the bottom and tap Clear History and Website Data. A menu appears asking what time range to clear — tap All time to remove everything, or pick a specific range like "Last hour" or "Last day" if you only want to clear recent browsing.
This removes the websites you visited, cached images and files from those sites, and stored passwords and autofill information. Safari will load slightly slower the first time you visit a website after this, because it has to read everything fresh. Your bookmarks and reading list stay untouched.
Delete and reinstall an app to clear its cache and data
If you want to clear cache for an app other than Safari — like Instagram, Gmail, or a game — the only way is to delete the app and install it again. Press and hold the app icon on your home screen, tap Remove App, then tap Delete App when asked to confirm. Go to the App Store, search for the app by name, and tap the cloud icon or Get button to reinstall it.
When you reinstall, the app starts fresh with no cached files and no stored data. You'll need to log back in and reset any preferences you had. This is more drastic than clearing cache alone, so only do it if the app is crashing, freezing, or acting seriously broken. For most storage problems, clearing Safari cache is enough.
If the app is one you paid for, the cloud icon appears instead of Get, and you won't be charged again. If you're worried about losing something — like game progress or saved work — check whether the app syncs to a cloud account (like Google Drive or iCloud) before you delete it.
Force-close a frozen or crashing app first
Before you delete an app, try force-closing it. Swipe up from the bottom of the screen (or swipe down from the top-right corner on newer iPhones) to open the app switcher, find the app that's stuck, and swipe up on its preview to close it. Wait a few seconds, then open the app again. This fixes most freezing and crashing without erasing anything.
If force-closing doesn't work and the app keeps crashing, then delete and reinstall it. The reinstall clears out corrupted files that caused the crash in the first place.
Check how much storage you're actually using
Open Settings, tap General, then tap iPhone Storage. You'll see a list of apps ranked by size, with the biggest ones at the top. This shows you which apps are taking up the most space. Clearing cache for Safari or deleting a large app like a game or video app will free the most storage.
The storage bar at the top shows your total capacity and how much is left. If you're running low, deleting apps you don't use regularly is faster than clearing cache. You can always reinstall them later if you need them.
What not to clear unless something is broken
Don't clear data for apps where you've saved important information — like banking apps, password managers, or apps that store documents — unless the app is seriously malfunctioning. Clearing data erases everything, including login information and any notes or files you saved inside the app.
If you're trying to free up storage space, clearing cache is usually enough. Clearing data is for when an app is broken and you want to start over with it. If you're unsure whether an app backs up its data to the cloud, open the app and look in its settings for a "backup" or "sync" option before you delete it.
Frequently Asked Questions
Will clearing cache make my iPhone faster?
Clearing cache frees up storage space, which can help if your iPhone is nearly full. It won't make your iPhone faster in day-to-day use. If an app is running slowly because it's corrupted, clearing its data by deleting and reinstalling it might help, but clearing cache alone usually won't speed things up.
Can I clear cache for individual apps without deleting them?
Not through Settings. iPhone only lets you clear Safari cache from Settings. For other apps, you have to delete and reinstall them. Some apps have their own cache-clearing option inside the app itself — check the app's settings menu to see if one exists.
What happens to my photos and messages if I clear cache?
Your photos and messages are safe. Cache is temporary files apps store to load faster. Your actual photos, messages, and anything you created stay on your iPhone. Only clearing data erases what you've saved, and that only happens when you delete and reinstall an app.
How often should I clear cache?
You don't need to clear cache on a schedule. Clear it when your iPhone is running low on storage, or when an app is acting broken. Most people clear Safari cache once every few months if they browse a lot, or not at all if they have plenty of storage space.
Will I lose my passwords if I clear Safari data?
Yes — clearing Safari data erases saved passwords and autofill information. You'll need to log back into websites after clearing. If you use iCloud Keychain to sync passwords across your devices, those passwords stay safe in iCloud, but you'll still need to enter them in Safari until it learns them again.