Where do I check what's using storage on my iPhone?
Go to Settings > General > iPhone Storage. Apple's support documentation describes this screen as showing recommendations and a list of apps with their storage usage, plus a colour-coded bar of how space is split across categories like Apps, Photos, Media, and System Data. This is the starting point for every method below — it tells you which category is actually worth spending time on, instead of guessing.
How do I act on Apple's storage recommendations?
On the iPhone Storage screen, Apple surfaces a set of recommendations tailored to what's actually on your device — these might include offloading unused apps, reviewing large attachments in Messages, or emptying Recently Deleted albums. Tap Show All to see the full list, read what each one does, and tap Enable to turn it on, or tap into the recommendation itself to review and delete specific content manually.
These recommendations are the fastest win because they're calculated from your device's actual usage rather than generic advice, so two people with the same iPhone model can see completely different suggestions.
How do I offload unused apps, and is that different from deleting them?
Offloading and deleting are not the same action:
- Offload: removes the app itself to free up its storage, but keeps its documents and data. The icon stays on the Home Screen with a small cloud symbol; tapping it reinstalls the app and restores the saved data.
- Delete: removes the app and all of its data completely.
To automate this, go to Settings > Apps > App Store and turn on Offload Unused Apps. When storage runs low, the system automatically offloads apps you haven't opened in a while — you don't have to remember to do it. To offload or delete a specific app manually, go back to iPhone Storage, tap the app, and choose the option you want.
How do I clear Safari's cache and browsing data?
Safari's accumulated history, cookies, and cached site data can add up, especially on an iPhone that's never had it cleared. Apple's support documentation gives two levels:
- Go to Settings > Apps > Safari and tap Clear History and Website Data to clear browsing history, cookies, and cached data together. This doesn't affect saved AutoFill information.
- To clear cached data while keeping your browsing history, go to Settings > Apps > Safari > Advanced > Website Data and tap Remove All Website Data.
Note that clearing Safari's history on the iPhone doesn't clear any separate history a website itself may keep about your visits — this only affects what's stored on the device (and in iCloud, if Safari syncing is on).
How do I manage Photos and iCloud storage to free up space?
For most people, Photos and Videos is the single biggest storage category. Apple's support documentation on managing photo and video storage points to iCloud Photos as the main lever: with it turned on and Optimize iPhone Storage selected (Settings > [your name] > iCloud > Photos), the iPhone keeps smaller, space-saving versions of photos and videos on the device while storing full-resolution originals in iCloud, downloading the full version only when you open a specific photo.
This requires enough iCloud storage on your Apple Account to hold the full library — the free tier is 5GB, which fills up fast with a large photo library, so this may mean moving to a paid iCloud+ storage plan. You can check and manage this at Settings > [your name] > iCloud > Manage Account Storage (or Manage Storage, depending on iOS version), where Apple also shows what else in iCloud Backup is taking up space.
People also ask
Why does System Data take up so much space on my iPhone?
System Data covers things like caches, logs, and temporary files that support features across the device. It fluctuates on its own and iPhone Storage doesn't offer a direct way to clear it, but restarting the iPhone can help clear some temporary caches contributing to it.
Do I lose my photos if I turn on Optimize iPhone Storage?
No. Optimize iPhone Storage keeps a smaller local copy and stores the full-resolution original safely in iCloud — it doesn't delete anything, provided your Apple Account has enough iCloud storage to hold the full library.
Is offloading an app enough, or should I just delete it?
Offload first if you're unsure — it frees the same app-size storage as deleting but keeps your data, so reinstalling later restores everything. Delete only apps you're certain you won't need again.