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 open Instagram, it saves thumbnail images. When you visit a website, Safari stores parts of the page. Your iPhone keeps this data so it doesn't have to read the same thing twice.

Over time, cache builds up and takes storage space. Clearing it frees up gigabytes, speeds up apps that have become sluggish, and removes data from sites you no longer visit. You won't lose passwords, photos, or messages — cache is only the temporary files apps use to run faster.

Most people clear cache once every few months, or when their iPhone feels slow. You can clear all cache at once or clear it for specific apps.

Key Takeaways

  • Cache is temporary data apps store to load faster, and clearing it frees storage without deleting your actual files or accounts.
  • Safari cache clears through Settings > Safari > Clear History and Website Data, and you choose whether to clear just today's data or everything.
  • Individual app cache clears through Settings > General > iPhone Storage, where you can see how much space each app uses and offload it to clear cache while keeping the app.
  • Clearing cache does not sign you out of apps or delete saved passwords, but you may have to wait slightly longer for pages to load the first time after clearing.

Clear Safari cache and browsing history

Open Settings on your home screen, scroll down and tap Safari, then tap Clear History and Website Data. A menu appears with three time-range options: the last hour, today and yesterday, or all time. Choose the range you want to clear.

Tap the blue Clear History and Website Data button at the bottom. Safari will remove the cached images, scripts, and other temporary files from websites you visited in that time period. Your bookmarks and saved passwords stay in place.

If you want to clear cache but keep your browsing history visible in Safari, you cannot do both at once — this setting clears both together. The alternative is to clear cache for individual apps instead, which is described below.

Clear cache for individual apps

Open Settings, tap General, then tap iPhone Storage. You will see a list of apps ranked by how much space they use. Find the app you want to clear cache for and tap it.

On the app's detail screen, you will see two options: Offload App and Delete App. Tap Offload App. This removes the app and its cache from your iPhone but keeps your account data and settings. When you reinstall the app from the App Store, your login information and preferences return.

If you want to keep the app installed and just clear its cache without offloading, you have a second option: go to Settings > [App Name] and look for a Clear Cache or Storage option within that app's own settings. Not all apps have this, but many do — Instagram, TikTok, and Spotify include it. Check the app's settings menu first before offloading.

Clear Photos app cache

The Photos app does not store traditional cache the way Safari or social media apps do, but it does create temporary files when you edit photos or use features like search. To clear this data, open Settings, tap General, then iPhone Storage, find Photos, and tap Offload App.

Your actual photos and videos stay in iCloud or on your device — offloading only removes the temporary editing files and search index. When you reopen Photos, it rebuilds the index, which may take a few minutes on first launch.

Automatic cache clearing and storage management

You can set your iPhone to clear cache automatically. Open Settings, tap General, then iPhone Storage, and scroll to the bottom. You will see Recommendations — this section suggests apps to offload if you have not used them recently.

Enable Offload Unused Apps if you want your iPhone to automatically remove apps you have not opened in a while and reinstall them when you need them again. This keeps cache from building up on apps you rarely use without permanently deleting them.

For a faster manual approach, go to Settings > General > iPhone Storage and offload any app you see using more than 500 MB. Most of that space is cache, not the app itself.

What happens after you clear cache

After clearing cache, apps will take slightly longer to load the first time you open them because they have to read their temporary files again. This is normal and usually takes only a few seconds. Subsequent opens will be fast again as new cache builds.

You will not be signed out of any apps, and your saved passwords will still work. Messages, photos, and documents you created stay exactly as they were. Only the temporary data that apps use to run faster is removed.

If an app crashes or behaves strangely after clearing cache, force-close it by swiping up from the bottom of the screen (or swiping down from the top right on iPhone X and newer) and then reopen it. The app will rebuild its cache on the next launch.

When to clear cache and how much space it saves

Clear cache when your iPhone storage is running low, when apps are slow to open, or when you want to remove data from websites you no longer visit. There is no harm in clearing cache weekly, though most people do it every few months.

The amount of space you free up depends on how much you use Safari and apps. Clearing Safari cache typically frees 100 MB to 1 GB. Offloading a single app like Instagram or TikTok can free 500 MB to 2 GB. If your iPhone is nearly full, clearing cache for your most-used apps is usually the fastest way to get breathing room without deleting actual files.

Frequently Asked Questions

Will clearing cache delete my photos or messages?

No. Cache is only temporary data that apps use to run faster. Your actual photos, messages, emails, and documents are stored separately and are not affected by clearing cache. You can clear cache without losing anything you created or saved.

Do I need to clear cache regularly?

Not necessarily. Clear cache when your iPhone storage is low, when apps feel slow, or when you want to remove browsing data from Safari. If your iPhone has plenty of free space and apps run smoothly, you can go months without clearing cache. It is not required maintenance.

What is the difference between offloading an app and deleting it?

Offloading removes the app and its cache but keeps your account data and settings. When you reinstall it, everything comes back. Deleting removes the app completely, and you lose any local data the app stored. For clearing cache, always choose Offload, not Delete.

Will I be signed out of apps after clearing cache?

No. Clearing cache does not remove your login information or passwords. You will stay signed into all your apps. Cache is only the temporary files apps use to load faster, not your account credentials.

Can I clear cache for just one website in Safari?

Safari does not offer a way to clear cache for a single website. When you clear Safari cache, it removes data from all websites you visited in the time range you choose. If you want to clear cache for specific apps instead, use the iPhone Storage method described above.