Short answer
The most private option is an app that stores files in your own iCloud rather than on the developer's servers, and encrypts them on your device first. EZ Save does this and adds Face ID / PIN locking. Apple Files with iCloud Drive is a solid free baseline. Traditional photo-vault apps are often less private than they appear, because many upload your files to their own cloud.
The only question that really matters: where do the files go?
Every storage app fits one of three models, and the differences matter far more than the feature list:
- On your device only. Most private, but nothing survives a lost phone.
- On the developer's servers. Convenient, but your files sit in a company's database, protected by their security and their policies. Pool millions of users' private files in one place and that place becomes a target.
- In your own cloud account. On iPhone, apps can use Apple's CloudKit private database — storage scoped to your Apple ID. The developer has no copy.
Model 3 plus on-device encryption is the strongest combination available to a normal iOS app. We explain the difference in detail here.
How the options compare
| App | Storage model | Encrypted on device | App lock | Saves links too |
|---|---|---|---|---|
| EZ Save | Your own iCloud | ✓ | Face ID / PIN | ✓ |
| Apple Files (iCloud Drive) | Your own iCloud | With Advanced Data Protection | ✗ | ✗ |
| Typical photo vault app | Often the developer's cloud | Varies | ✓ | ✗ |
| Google Drive / Dropbox | Provider's cloud | ✗ | Varies | ✗ |
Questions worth asking before you trust an app
- Does the privacy policy name a developer-owned database or server storing your content?
- Is content encrypted before it leaves your device, and who holds the key?
- Can the whole app be locked, or only individual items hidden?
- Does it need an account just to store files locally? (It should not.)
- Are there advertising or tracking SDKs in the app?
A note on “vault” apps
Apps that hide photos behind a PIN feel private, but the lock on the front door matters less than where the files are kept. If a vault uploads to its own servers, you have swapped a visible camera roll for an invisible database you do not control. More on that comparison here.
Bottom line: choose an app that keeps files in your own iCloud, encrypts on-device, and locks behind Face ID. On iPhone that is EZ Save for mixed content, or Apple Files with Advanced Data Protection for plain documents.
Frequently asked questions
What is the most private way to store files on an iPhone?
Are photo vault apps actually safe?
Does EZ Save store my files on its own servers?
Can I lock an app behind Face ID on iPhone?
Private storage without the server
Keep sensitive files encrypted, locked to you, and inside your own Apple account.