There’s no single button to clear cache on iPhone, so the trick is knowing which caches are worth clearing. For most people in India, the two biggest wins are Safari’s website data and WhatsApp media from family groups, and both take under five minutes.
The fix most guides recommend, offloading an app, keeps the very data you’re trying to delete. I’ll explain why in section 3, and what to do instead.
⚡ Key takeaways
- Safari: Settings, Apps, Safari, Clear History and Website Data. To keep history, use Advanced, Website Data, Remove All Website Data.
- WhatsApp: Settings, Storage and data, Manage storage. Sort by “Larger than 5 MB” and “Frequently forwarded”.
- Offload App keeps an app’s documents and data, per Apple. Only Delete App removes them.
- iOS clears temporary cache files on its own when storage runs low, so a paid “cleaner” app is rarely needed.
- This guide is for iPhones on recent iOS versions. Menu names can differ slightly on older iOS.
What “Cache” on an iPhone Really Is
Cache is temporary data that apps and websites save so they load faster next time. Thumbnails, images from sites you’ve visited, videos you streamed, bits of maps. It’s useful, until it isn’t.
Apple’s storage help page says iOS already removes cached files automatically when the device needs more space. It also groups caches and logs under a section called Other (newer iOS versions call it System Data), which includes items like Siri voices, fonts and “non-removable logs and caches”.
So you can’t wipe every cache by hand, and you don’t need to. What you can do is clear the big, visible ones that iOS keeps because it thinks you still want them.
First, Find What’s Eating Your Storage
Before you delete anything, check where the space went.
- Open Settings, then General, then iPhone Storage.
- Wait a few seconds for the coloured bar to load.
- Look at the app list. It’s sorted by size, biggest first.
Apple notes that the size shown for an app may not count all its cached and temporary data. Still, the list tells you where to start. In many Indian households, WhatsApp and Photos are the usual suspects.
Check the recommendations
Under the bar, iOS may show suggestions like “Offload Unused Apps” or reviewing large videos. Tap Show All to see each one. They’re a good starting point, but read on before you enable the offload option.
💡 Pro tip
On a 64GB or 128GB iPhone, try to keep at least a few GB free. Apple says a nearly full phone starts removing things on its own, and you may get the “Storage Almost Full” alert at the worst time, like during a Diwali video.
Also readCheck Your Phone’s Battery Health in 2 Minutes (Android, iPhone)
The Offload Trap: Why It Doesn’t Clear Cache on iPhone
This is where the old advice goes wrong. Offloading an app sounds like a clean slate. It isn’t.
| Option | What it removes | What it keeps | Clears the app’s cache? |
|---|---|---|---|
| Offload App | The app itself | Documents and data | No |
| Delete App | The app and its related data | Nothing (unless synced to iCloud or the app’s server) | Yes |
| Offload Unused Apps (auto) | Apps you haven’t used in a while | Their documents and data | No |
Apple’s page states it plainly: offloading frees the space the app uses but keeps its documents and data, and reinstalling restores them. Deleting removes the app and its related data.
So if Instagram or a game has built up a few GB of data, offloading won’t touch it. You need to delete and reinstall. Before you do, check that you can log back in, and that anything important (chats, game progress, notes) is backed up or synced.
⚠️ Watch out
Never delete and reinstall WhatsApp without a fresh chat backup (WhatsApp Settings, Chats, Chat Backup). Deleting the app removes its data from the phone, including chats that aren’t backed up. Use WhatsApp’s own storage tool below instead.
How to Clear Cache on iPhone: 6 Fixes That Work
1. Clear Safari’s cache and cookies
Apple’s Safari guide gives two options.
- Everything: Settings, Apps, Safari, then Clear History and Website Data. Pick a time range and confirm. Apple says this doesn’t change your AutoFill information.
- Cache only, keep history: Settings, Apps, Safari, Advanced, Website Data, then Remove All Website Data.
You’ll need to sign in to some websites again afterwards, so keep your passwords handy.
2. Clean out WhatsApp media
WhatsApp is the storage hog in most Indian families, thanks to good-morning images, forwarded videos and festival greetings. The in-app tool is under Settings, Storage and data, Manage storage, as IONOS’s step-by-step guide shows.
- Open Larger than 5 MB and delete old videos you don’t need.
- Open Frequently forwarded and clear the viral forwards.
- Tap a busy group chat to clear only its media.
Then turn off automatic media download in Storage and data, so it doesn’t refill.
3. Delete and reinstall heavy apps
For social media, streaming and shopping apps that show large “Documents and Data” in iPhone Storage, use Delete App and reinstall from the App Store. Log back in. The cached feed, video and image files are gone.
4. Clear in-app caches where offered
Some apps have their own clear-cache, offline downloads or storage option inside their settings. Streaming and music apps often store offline downloads that take far more space than cache. Check there before deleting the whole app.
5. Empty Recently Deleted in Photos
Deleted photos sit in the Recently Deleted album for a while before they go for good. Open Photos, Albums, Recently Deleted, then delete them for good if you’re sure. This doesn’t touch cache, but it’s often several GB.
6. Restart once in a while
A restart won’t free much space. But if the phone feels sluggish after a big update or a long week of heavy use, it’s the easiest first step and costs nothing.
Also read15 Smartphone Privacy Settings You Probably Never Changed
Do You Need a Cleaner App?
Honestly, no. The older version of this article suggested paid desktop cleaner tools. Apple’s own documentation says iOS removes cached files automatically when the phone needs space, and the built-in tools above handle the rest.
Everything a cleaner would do for cache, you can do yourself in the steps above. Save the money for an iCloud plan if you really need space.
When storage is really the problem
If you’ve cleared caches and you’re still full, the issue is usually photos and videos, not cache. Your options:
- Move old videos to a laptop or external drive.
- Turn on Optimise iPhone Storage for Photos if you use iCloud Photos, so full-size files stay in iCloud.
- Buy a bigger iCloud plan or upgrade to a phone with more storage when the time comes.
A 10-Minute Cleanup Routine (Do It Monthly)
- Settings, General, iPhone Storage: note the top three apps.
- Safari: remove website data.
- WhatsApp: Manage storage, clear “Larger than 5 MB” and forwarded files.
- One heavy app: delete and reinstall if its Documents and Data looks large.
- Photos: empty Recently Deleted.
- Restart the phone.
Before you sell or hand down an old iPhone, do a full erase from Settings instead. Apple’s guide for buyers says a used iPhone should be erased and removed from the owner’s account first, and our guide to buying a used phone explains why.
✅ Our verdict
To clear cache on iPhone, skip offloading and cleaner apps. Clear Safari’s website data, clean WhatsApp media with its own tool, and delete and reinstall the one or two apps hoarding data. That frees more space in 10 minutes than any “booster” app.
Frequently Asked Questions
How do I clear all cache on my iPhone at once?
There’s no single button. Clear Safari website data, use WhatsApp’s Manage storage tool, and delete and reinstall apps with large data. iOS clears other temporary cache on its own when storage runs low.
Does offloading an app clear its cache?
No. Apple says offloading removes the app but keeps its documents and data. Use Delete App to remove the data too.
Will clearing Safari cache delete my passwords?
No. Apple says clearing history and website data doesn’t change your AutoFill information. You’ll be signed out of some websites, though.
What is System Data on iPhone and can I clear it?
It’s space used by caches, logs and other system files, which Apple lists as including “non-removable logs and caches”. You can’t clear it directly. Restarting and keeping some storage free lets iOS manage it.
Does clearing cache make an iPhone faster?
It can help apps that have stored a lot of data, and freeing space helps when the phone is nearly full. If an older iPhone is slow, also check its battery health.
The Bottom Line
Clearing cache on an iPhone is about three targets: Safari, WhatsApp and one or two heavy apps. Do the 10-minute routine once a month and you’ll rarely see the storage warning.
While you’re in Settings, check your battery health too, since a worn battery makes an old iPhone feel slow. And if privacy is next on your list, read our iPhone vs Android privacy guide.
Keep reading
Read nextCheck Your Phone’s Battery Health in 2 Minutes (Android, iPhone)Read next15 Smartphone Privacy Settings You Probably Never Changed
Read nextiPhone vs Android privacy: Which Is Better for Privacy in 2026?Sources
- Apple Support: check the storage on your iPhone, offload vs delete apps, cached files
- Apple Support: clear history, cache and cookies in Safari on iPhone
- Apple Support: before you buy a used iPhone or iPad
- IONOS Digital Guide: WhatsApp storage full, Manage storage steps on iPhone