How to Clear Cache on iPhone App by App
Unlike Android, iOS has no single "clear cache" button, so you clear cache one app at a time: in Safari, use Settings > Apps > Safari > Clear History and Website Data; for most other apps, you either use an in-app setting or offload the app via Settings > General > iPhone Storage > [App] > Offload App. This guide is for anyone whose iPhone is filling up with hidden app data and who wants to clear it safely, app by app, without logging out of everything or losing their photos.
TL;DR
- iOS has no global cache button; you clear cache per app, not all at once.
- Safari is the one app with a true built-in cache clear: Settings > Apps > Safari > Clear History and Website Data.
- For most apps, Offload App removes the app's binary and cache but keeps your documents and data, then reinstalls clean.
- A few apps (Spotify, Telegram, X) have their own in-app "clear cache" toggle that won't log you out.
- iOS manages and purges most caches automatically; clearing manually frees space short-term but it usually rebuilds.
Why doesn't the iPhone have a single 'clear cache' button?
Apple designed iOS to manage app caches for you. Each app stores temporary files in its own sandboxed container, and the system is supposed to purge that "purgeable" data automatically when storage runs low. That's why you'll see a category called "Documents & Data" under each app in Settings > General > iPhone Storage but no master button to wipe it all.
The trade-off is control. Some apps cache aggressively and never clean up after themselves, so "Documents & Data" can balloon to several gigabytes. When that happens, you have to go in app by app. The good news: the per-app methods below are safe and predictable once you know which tool each app responds to.
How do I clear the Safari cache on iPhone?
Safari is the only built-in app with a real cache-clearing control. Here's the modern path (iOS 18 and later moved app settings under a new Apps menu):
- Open Settings.
- Tap Apps, then scroll to and tap Safari.
- Scroll down and tap Clear History and Website Data.
- Choose the time range (you can keep recent history if you only want a partial clear) and confirm.
This clears browsing history, cookies, and the website cache in one step. You'll stay signed into iCloud, but you may be signed out of some websites because cookies are cleared. To clear only the cache for a single site without nuking everything, go to Settings > Apps > Safari > Advanced > Website Data, then swipe left on a specific domain and tap Delete.
For a full walkthrough across devices, see how to clear Safari cache on both Mac and iPhone.
How do I clear cache for other apps?
Most apps don't expose a cache button, so you have two reliable tools. Here's how they compare:
| Method | What it removes | What it keeps | Logs you out? |
|---|---|---|---|
| In-app "Clear cache" | Cached media, thumbnails | Account, settings, history | No |
| Offload App | App binary + cache | Documents & data | Usually no |
| Delete App | Everything for that app | Nothing local | Yes |
Option A — Offload the app (recommended for most apps):
- Open Settings > General > iPhone Storage.
- Tap the app in the list (sorted by size, biggest first).
- Tap Offload App and confirm.
- Tap the app's greyed icon on your Home Screen to reinstall it; your saved data returns, the cache does not.
Option B — Use the app's own clear-cache setting (only some apps have one):
- Spotify: Profile icon > Settings and privacy > Storage > Clear cache. This deletes downloaded-for-offline temporary data but not your saved playlists. See how to clear Spotify cache without losing playlists.
- Telegram: Settings > Data and Storage > Storage Usage > Clear Cache, where you can pick what to keep.
- X (Twitter): Settings and privacy > Accessibility, display and languages > Data usage > Media storage / Web storage.
- Instagram: iPhone offers limited in-app cache controls, so offloading is often the cleaner route. See how to clear Instagram cache on iPhone without logging out.
If an app has no in-app option and you don't want to offload, your only other path is to delete and reinstall it, which logs you out and removes downloads.
What about WhatsApp and other chat apps?
Chat apps are special: their "cache" is mostly received photos, videos, and voice notes, which are real saved files, not throwaway temporary data. Offloading or clearing cache won't reliably shrink them, and deleting the wrong thing can wipe media you meant to keep.
- In WhatsApp, go to Settings > Storage and Data > Manage Storage.
- Review the largest conversations and forwarded/large files.
- Delete media you no longer need (your text chats stay intact).
For the safe step-by-step on every messenger, read how to clear WhatsApp and Telegram storage without losing your chats. And if you're unsure what "Documents & Data" even is, this guide explains what app cache is and when it's safe to clear.
Is it safe to clear cache on iPhone, and does it actually help?
Clearing cache on iPhone is safe when you use the methods above. Here's the honest breakdown of what each layer does:
What iOS does natively: the system automatically purges "purgeable" cache when storage gets tight, which is why your free space sometimes recovers on its own. Offload App is Apple's official, data-preserving way to reclaim space, and Safari's clear button is a true cache wipe.
What a cleaner app like Cleanor adds: iOS sandboxing means no third-party app can reach inside another app's cache, so any honest iPhone tool works on what it can legitimately access, mainly your photo and video library. Cleanor helps you find and remove the things that actually fill an iPhone: duplicate and similar photos, large videos, and screenshots, with a review step so you approve every deletion. That's a far bigger and more durable win than chasing app caches.
What no app can do: no iPhone app, Cleanor included, can delete another app's internal cache for you, magically clear "System Data," or keep cache from rebuilding. Cache returns the moment you use an app again. Be skeptical of any tool promising a one-tap "clear all cache" on iOS; the sandbox makes that technically impossible. For the full picture, see the truth about cleaner apps and whether they're safe to use.
One more honest note: clearing cache rarely makes your phone faster. The real performance lever is keeping some free headroom, not wiping caches; here's why freeing space helps and the 10% rule.
FAQ
Does clearing cache on iPhone delete my photos or messages?
No. Offloading an app and using in-app clear-cache buttons keep your real data, including photos, messages, and account logins. The exceptions are Safari's "Clear History and Website Data," which removes cookies and can sign you out of websites, and deleting (not offloading) an app, which removes its local data.
What's the difference between Offload App and Delete App?
Offload App removes the app and its cache but keeps your documents and settings, so reinstalling restores your data. Delete App removes everything stored locally for that app and signs you out. Offload is the safer choice when you only want to reclaim cache space.
Why does my cache come back after I clear it?
Cache is rebuilt automatically as you use an app, that's its whole purpose: storing images and data locally so the app loads faster next time. Clearing it gives short-term space, but it grows again with normal use. If an app constantly bloats, the real fix is managing its saved media, not repeatedly clearing cache.
How do I clear cache if an app has no clear-cache option?
Use Settings > General > iPhone Storage, tap the app, and choose Offload App. This removes the cache while keeping your data, then you reinstall from the greyed-out Home Screen icon. If even that doesn't shrink it, the space is real saved files, not cache, and you'll need to delete media inside the app.
Clear smarter, not just caches
Clearing cache app by app helps in a pinch, but on iPhone it's usually photos and videos, not caches, that eat your storage. To target the real culprits, Cleanor scans your library for duplicate and near-duplicate photos, big videos, and clutter, and lets you review everything before deleting. See how it works on Cleanor for iOS, or start with the full playbook at clean up phone storage.
Not sure where to begin? Start with storage full: what should I delete first, then learn what System Data is and whether you can delete it.