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 browser saves images, text, and login information. When you use an app, it stores settings and recent data. This speeds things up — but over time, cache can pile up and slow your phone down, or cause an app to behave strangely.

Clearing cache does not delete your photos, messages, or passwords. It only removes the temporary files that apps and Safari no longer need. Think of it like emptying a junk drawer — you keep the important things, but get rid of the clutter that was taking up space.

Most people clear cache when an app is crashing, when Safari is running slowly, or when they want to free up storage space. You can clear it all at once or app by app, depending on what you need.

Key Takeaways

  • Cache is temporary data stored by apps and Safari to load faster, and clearing it does not delete your photos, messages, or account information.
  • You can clear Safari cache through Settings by going to Safari, then Clear History and Website Data, and choosing how far back to clear.
  • Individual apps store their own cache, which you can clear by going to Settings, General, iPhone Storage, selecting the app, and choosing Offload App (which keeps your data) or Delete App (which removes everything).
  • Clearing cache is safe to do regularly and often fixes apps that are crashing, freezing, or loading slowly.
  • If you want to keep login information saved while clearing cache, choose "History" instead of "All time" in Safari settings.

Clearing Safari cache and browsing history

Safari stores website data separately from app cache. To clear it, open Settings and scroll down to find Safari. Tap Safari, then scroll down and tap Clear History and Website Data. A menu will appear asking how far back you want to clear — you can choose the last hour, today, today and yesterday, or all time.

If you choose "All time," Safari will clear all saved passwords, autofill information, and website data from every site you have visited. If you only want to clear recent browsing, choose a shorter time period. The cache itself clears either way, but the time range affects whether you lose saved login information.

After you tap the time range, Safari will clear the data when ready. You may notice websites load slightly slower the first time you visit them after clearing cache, because Safari has to read the images and data again. This slowdown is temporary and usually not noticeable.

Clearing cache for individual apps

Apps like Instagram, TikTok, Gmail, and Maps store their own cache separately from Safari. To clear an app's cache without deleting the app itself, open Settings and go to General. Tap iPhone Storage — this shows you how much space each app is using. Find the app you want to clear and tap it.

You will see two options: Offload App and Delete App. Offload App removes the cache and temporary files but keeps your account information and any data you created in the app. This is the safer choice if you want to keep your login information. Delete App removes everything, including your account data, so only use this if you plan to reinstall the app fresh.

After you tap Offload App, the app will disappear from your home screen, but you can reinstall it from the App Store without losing your account. When you reinstall it, it will read a fresh copy without the old cache, which often fixes crashes or slow loading.

Clearing cache for Photos and Mail

The Photos app does not store traditional cache the way Safari does, but it does create temporary files when you edit photos or videos. These files are usually cleaned up automatically, but you can force a cleanup by going to Settings, General, iPhone Storage, and tapping Photos. Then tap Offload App. This removes temporary editing files without deleting your actual photos.

Mail works similarly. If Mail is running slowly or not loading messages properly, go to Settings, Mail, Accounts, and tap the account that is giving you trouble. Tap Account, then tap Delete from My iPhone. This removes the cached email data. Then go back and add the account again — Mail will re-read your messages fresh.

When to clear cache and what to expect

Clear cache when an app is crashing repeatedly, when Safari is slow to load websites, or when your iPhone is running out of storage space. You do not need to clear cache on a schedule — it is safe to do whenever you notice a problem. Some people clear Safari cache weekly, while others only do it when they notice slowness.

After clearing cache, apps may take a few seconds longer to open the first time, because they have to rebuild their temporary files. Websites may also load slightly slower on your first visit after clearing Safari cache. This is normal and temporary. By the second or third visit, everything should load at normal speed again as new cache builds up.

If clearing cache does not fix a crashing app, try restarting your iPhone by holding the power button and swiping to power off, then turning it back on. If the problem continues, you may need to delete and reinstall the app completely.

Cache versus storage: what gets deleted

Cache is not the same as storage. When you clear cache, you are only removing temporary files — you keep your photos, messages, contacts, and app data. Think of cache as the working copies that apps make while they are running, not the original files you created.

If you want to see how much space cache is actually taking up, go to Settings, General, iPhone Storage. The list shows each app and how much space it uses. Apps with large cache files will show a bigger number. Clearing cache for a heavily-used app like Instagram or Maps can sometimes free up several hundred megabytes of space.

If you are running very low on storage and need to free up space quickly, clearing cache for your most-used apps is usually the fastest way. If that is not enough, you may need to delete photos, videos, or apps you no longer use.

Frequently Asked Questions

Will clearing cache delete my passwords and login information?

It depends on what you clear. If you clear Safari cache by choosing "All time," you will lose saved passwords and autofill information. If you choose a shorter time period like "Today," your saved passwords usually stay. For individual apps, using Offload App keeps your login information, but Delete App removes it.

How much storage space does cache actually take up?

It varies by how much you use your iPhone. Heavy users of Safari, Instagram, TikTok, and Maps might have 500 megabytes to 1 gigabyte of cache. Light users might have 100 to 200 megabytes. You can see the exact amount for each app in Settings, General, iPhone Storage.

Can I clear cache without losing my photos or messages?

Yes. Cache is separate from your actual photos, messages, and files. Clearing cache only removes temporary data that apps created while running. Your photos, messages, and documents stay on your phone no matter what cache you clear.

What is the difference between clearing cache and restarting my iPhone?

Restarting your iPhone clears temporary data from memory (RAM) but does not touch the cache stored on your phone. Clearing cache removes files saved to storage. Both can help fix slow apps, but they work differently — restarting is faster, while clearing cache frees up permanent storage space.

Do I need to clear cache regularly?

No. You only need to clear cache when you notice a problem or when you are running low on storage. There is no benefit to clearing cache on a schedule if your phone is working fine. Some people do it monthly as maintenance, but it is not necessary.