Unlike Android, iPhone has no single button that clears every app's cache. Instead you have three real options: offload an app to wipe its cached data while keeping your documents, clear Safari's history and website data for browsing cache, or use an app's own in-app cache setting where it offers one. Deleting and reinstalling an app is the nuclear version.
The rest of this guide covers which method suits which problem, how to find the storage hogs first, and when clearing cache won't help at all.
What is app cache on an iPhone, and why does it grow?
Cache is the pile of temporary files an app saves so it doesn't re-download the same things repeatedly: album art, feed thumbnails, map tiles, message attachments. It makes apps fast and saves mobile data — a cache isn't a bug, it's a feature doing its job.
The problem is that it rarely cleans up after itself aggressively enough. On iPhone this shows up in Settings as "Documents & Data" next to an app — the number that quietly grows from a few megabytes to several gigabytes. Streaming, social, messaging, and podcast apps are the usual offenders, because they constantly download media you view once.
One distinction before you start deleting things: Documents & Data mixes cache with files you actually care about. Downloaded playlists, offline maps, saved podcast episodes, and message attachments all live there too. That's why the method you choose matters.
How do I find which apps are using the most storage?
Always start here, because clearing cache on a small app is wasted effort. Open Settings → General → iPhone Storage (exact wording shifts slightly between iOS versions). After a few seconds it lists every app sorted by size, largest first, with recommendations generated for your specific phone.
Tap any app and you'll see two numbers: the App Size (the program itself, which you can't shrink) and Documents & Data (your content plus the cache — the part you can reclaim). Focus on any app where Documents & Data is far larger than the app itself. That's where the space went.
What are the ways to clear cache on iPhone?
Here's the full toolkit in one place, weakest and safest first:
| Method | What it clears | What you keep | Best for |
|---|---|---|---|
| In-app cache setting | Only what the app defines as cache | Everything else in the app | Apps that offer it — the cleanest option |
| Offload App | The app itself and its cache | Documents, data and settings; icon stays on the Home Screen | Big apps you still want, when storage is tight |
| Clear Safari website data | Browsing cache, cookies, site data | Bookmarks and saved passwords | Slow, broken, or misbehaving web pages |
| Delete and reinstall | Everything the app stored locally | Only what's synced to your account or the cloud | A truly broken app, as a last resort |
| Restart the iPhone | Temporary system memory | All files and data | A quick first try before anything else |
Work down that table rather than jumping to the bottom — most storage problems are solved in the first two rows.
Method 1: Check the app's own settings first
Many apps — browsers, streaming services, messaging apps, map apps — include a cache or storage control in their own settings, often labelled Clear cache, Storage, Downloads, or Manage storage. This is the best option, because the developer decides what's safe to delete, so you're not gambling with your saved files.
Open the app, find its settings (commonly behind a profile icon or a gear), and look for a storage or data section. In messaging apps, look for a media or attachments cleanup tool — old photos and videos in group chats are frequently the single biggest thing on a phone.
Method 2: Offload the app
Offloading is Apple's built-in compromise and the method most people should reach for. It removes the app's program files — cached data included — while preserving your documents and settings. The icon stays on your Home Screen with a small cloud symbol; tap it and the app redownloads and picks up roughly where you left off, as long as it's still available in the App Store.
You'll find it in Settings → General → iPhone Storage → [the app] → Offload App. An Offload Unused Apps option does this automatically for apps you haven't opened in a long time — reasonable if you're chronically short on space, at the cost of an occasional wait while an app redownloads.
Method 3: Clear Safari's website data
If web pages load slowly, show outdated content, or break on one site, clear the browser cache instead. In recent iOS versions this lives under Settings → Apps → Safari (older versions list Safari directly in Settings), where you'll find an option to clear history and website data.
Two things to know first: you'll be signed out of most websites, and on some versions this clears history across every device signed into the same iCloud account. Bookmarks and saved passwords are unaffected. Third-party browsers keep separate caches inside their own settings, so clearing Safari does nothing for them.
Method 4: Delete and reinstall (last resort)
Deleting an app removes everything it stored locally. Use this only when an app is genuinely misbehaving — crashing on launch, stuck syncing, showing errors that survive a restart — and only once you're certain your content is safe in the cloud or in your account. Our guide to backing up your phone properly covers how to confirm a backup exists before you rely on it, which is the step people skip right before losing something.
Does clearing app cache actually speed up an iPhone?
Sometimes — but less often than the internet claims. Clearing cache helps mainly when storage is nearly full, because a phone with almost no free space struggles to write the temporary files the system needs, and everything drags. Free up several gigabytes and you'll often feel the difference.
With plenty of free storage, clearing cache does little for speed and can briefly make apps slower while they re-download what you deleted. The slowness is then coming from somewhere else — background activity, an aging battery, or an overdue update. Our breakdown of why phones get slow and what actually fixes it works through those causes in order.
Should I use an iPhone cleaner app?
No — for a structural reason: iOS deliberately prevents apps from reaching into other apps' storage. A third-party app cannot clear another app's cache, because the operating system doesn't allow it. Anything advertising that ability is, at best, showing you the same storage numbers Settings shows for free.
These apps also tend to ask for broad permissions, run in the background, and push subscriptions or ads. Every useful action here — offload, clear website data, delete — is built into Settings at no cost. If you're weighing whether any app deserves a place on your phone, our checklist for choosing apps you can trust applies squarely here.
FAQ
Where is the clear cache option on iPhone?
There isn't a single one. iOS doesn't provide a system-wide clear-cache button the way Android does. The closest equivalents are Offload App under Settings → General → iPhone Storage, the clear-history-and-website-data option in Safari's settings, and whatever cache control an app builds into its own settings. Menu names shift between iOS versions, so expect small differences on your device.
What's the difference between offloading and deleting an app?
Offloading removes the app and its cache but keeps your documents, data, and settings, leaving the icon on your Home Screen so a tap restores it. Deleting removes everything stored locally. Offload when you want the space back but still want the app; delete when you're finished with it or need a clean reinstall.
Will clearing cache delete my photos or messages?
Not if you use the in-app cache setting or Offload App — both preserve your content. Deleting an app is different: anything stored only on the device and not synced to iCloud or your account goes with it. Downloaded music, offline maps, and saved podcast episodes are what people most often lose this way.
Why does my app cache keep coming back?
Because that's what cache is for. Apps rebuild it as you use them, re-downloading thumbnails and media to stay fast. Clearing cache is periodic maintenance, not a permanent fix. If one app balloons back to several gigabytes within days, look for a download or auto-save setting inside it, or consider a lighter alternative.
How often should I clear my iPhone's cache?
Only when you have a reason: storage running low, an app misbehaving, or a website that won't load correctly. There's no benefit to a schedule — clearing cache on a phone with plenty of free space just means slower apps and more mobile data used while everything re-downloads.
Next step
The routine is short: open iPhone Storage, find the apps with huge Documents & Data, use the app's own cleanup tool if it has one, offload the ones that don't, and clear Safari's website data if web pages are the problem. Skip the cleaner apps — they can't do what they claim.
And if one app keeps eating gigabytes no matter what you clear, the real fix may be a different app — browse the side-by-side app comparisons at CNTechApp to find a lighter alternative.
