What cache is and why clearing it helps

Cache is temporary data that apps and Safari store on your iPhone to load faster next time. When you visit a website, your phone saves images, text, and login information. When you use an app, it stores settings and recent data. This speeds things up — but over time, cached files pile up and can slow your phone down, cause apps to misbehave, or take up storage space you need.

Clearing cache does not delete your passwords, photos, or messages. It only removes the temporary copies apps made to run more smoothly. Think of it like clearing out a junk drawer — you keep the important things, but get rid of the stuff taking up room.

Key Takeaways

  • Safari cache clears through Settings > Safari > Clear History and Website Data, and you can choose to clear only the last hour or all time.
  • Individual apps store their own cache, which you clear by going to Settings > General > iPhone Storage, finding the app, and tapping Offload App (which keeps your data) or Delete App (which removes everything).
  • Clearing cache is safe and will not delete your passwords, photos, messages, or account information.
  • If an app is crashing or running slowly, clearing its cache is often the fastest fix before you try restarting your phone.

How to clear Safari cache and browsing history

Open Settings on your home screen. Scroll down and tap Safari — it is usually near the bottom of the list. Tap Clear History and Website Data. A menu appears with three time options: the last hour, today, or all time. Choose whichever matches what you want to clear.

If you want to clear cache but keep your browsing history visible, you have a second option: go back to Settings > Safari and toggle off "Privacy-Preserving Ad Measurement" and "Privacy-Preserving Load Measurement". These settings store data about your browsing. Turning them off clears that specific cache without touching your history.

How to clear cache for individual apps

Each app on your iPhone stores its own cache separately. Go to Settings > General > iPhone Storage. Scroll through the list until you find the app you want to clear. Tap it. You will see two options: Offload App and Delete App.

Tap Offload App. This removes the app and its cache from your phone but keeps your account data and settings. When you reinstall the app later (from the App Store), your login and preferences will still be there. If you tap Delete App instead, everything goes — cache, data, and settings. Use Offload App unless you want a completely fresh start with that app.

After you offload an app, you can reinstall it when ready by going to the App Store, searching for it, and tapping the cloud icon with a read arrow. It will read again in seconds.

When to clear cache and what to expect

Clear cache when an app keeps crashing, when Safari is slow to load pages, or when your iPhone storage is nearly full. Clearing cache usually frees up between 100 megabytes and several gigabytes, depending on how much you have used your phone. The amount varies widely — a phone that streams video constantly will have more cached data than one used mainly for calls and messages.

After you clear cache, apps may take a few seconds longer to open the first time because they have to read fresh data. Websites may load slightly slower on your first visit. This is normal and temporary. By the second or third use, everything returns to normal speed as new cache builds up.

Cache versus cookies and other stored data

Cache is different from cookies, which are small files websites use to remember you. When you clear Safari cache, you also clear cookies by default — that is why you may have to log back into websites. If you want to keep cookies but clear cache, Safari does not offer that option directly. You would need to use a different browser like Chrome or Firefox, which have more granular clearing options.

Your iPhone also stores other data that clearing cache does not touch: your iCloud backup, photos in the Photos app, messages, and files in the Files app. Clearing cache only removes temporary files that apps created to run faster.

Troubleshooting when clearing cache does not fix the problem

If an app still crashes after you clear its cache, try restarting your iPhone. Press and hold the side button and either volume button until the power-off slider appears. Slide to power off, wait 10 seconds, then press and hold the side button again until the Apple logo appears. This forces your phone to reload everything from scratch.

If the problem continues after a restart, the issue is usually not cache — it is a bug in the app itself or a conflict with your iOS version. Check the App Store to see if an update is available for that app. If one is, install it. If the app still does not work, you may need to delete it and reinstall it completely, or contact the app maker's support team.

Frequently Asked Questions

Will clearing cache delete my passwords?

No. Clearing cache removes temporary files only. Your saved passwords stay in your iPhone's keychain, which is a separate find storage system. You will stay logged into most apps and websites after clearing cache.

How much storage space will I free up?

It depends on how much you use your phone. Clearing Safari cache might free up 500 megabytes to 2 gigabytes. Clearing app cache varies widely — a photo app might free up several gigabytes, while a messaging app might free up only 100 megabytes. Check iPhone Storage in Settings to see which apps are using the most space.

Can I clear cache automatically on a schedule?

Safari can clear cache automatically when you close it. Go to Settings > Safari > Clear History and Website Data and toggle on "Clear History and Website Data". Choose how often: when you close Safari, daily, weekly, or monthly. Apps do not have an automatic cache-clearing option — you have to clear them manually.

What if I clear cache and then realize I needed something?

If you cleared Safari cache and need to log back into a website, just enter your username and password again — your account is still there. If you offloaded an app and lost data, check whether that app syncs to iCloud. Many apps (like Notes, Reminders, and Mail) back up to iCloud automatically, so reinstalling the app will restore your data.

Is it safe to clear cache regularly?

Yes. Clearing cache is completely safe and does not harm your iPhone. Many people clear cache monthly or whenever their phone feels slow. There is no downside to doing it regularly.