Most people searching for a way to password protect a folder on their phone want one simple thing: a place for private photos and documents that doesn't open just because the phone is unlocked. iPhone and Android handle that very differently. Here's what each one offers, how to set it up, and the one question that tells you whether a locked folder is actually protecting anything.

On iPhone: There's No Folder Password

iOS doesn't let you put a password on a folder. What it offers instead is a set of partial options:

  1. Require Face ID on the Files app. On recent iOS versions, long-press the Files icon and choose Require Face ID. That locks the whole app behind your device unlock, not a separate password for one folder.
  2. The Hidden album in Photos. Locked behind Face ID, Touch ID or your passcode on recent iOS versions. It hides photos, but it opens with the same unlock as the phone.
  3. Locked notes. The Notes app can lock individual notes with a separate Notes password. It's the only built-in option with its own password, and it's made for text, not a folder of files.

So on iPhone, every built-in lock either shares your phone's unlock or only covers notes. How to Encrypt Files on iPhone goes through each of these in more detail.

On Android: Safe Folder or Secure Folder

Android does have real, separately locked folders, depending on your phone:

  1. Safe Folder (Files by Google). Open the Files app, tap Safe Folder, set a PIN separate from your lock screen, and move files in. They're encrypted and removed from your gallery and regular file browser until you unlock it.
  2. Secure Folder (Samsung only). A separate Samsung feature with its own lock that creates a private space for files and apps. Our Samsung Secure Folder comparison covers how it holds up.

Both are free and genuinely useful. Both also stay on that one phone. How to Encrypt a Folder on Android walks through Safe Folder step by step.

The Question That Matters: Lock or Just a Gate?

A password on a folder can mean two very different things:

  • A real lock. The files are encrypted, and the password (or a key derived from it) is what decrypts them. Without it, the files are unreadable, even from outside the app.
  • A gate. The files are moved somewhere hidden and the app asks for a PIN before showing them. The files themselves are ordinary. Plug the phone into a computer or use a file manager, and they open normally.

Plenty of folder lock and vault apps in the app stores are gates, not locks. Photo Vault vs. Hiding Photos and Why the "Hidden" Folder Isn't Really Hidden explain why hiding a file isn't the same as protecting it. Three quick checks before you trust one:

  1. Does it say the files are encrypted on your device? "Hidden", "locked" and "private" aren't the same promise.
  2. Is the password separate from your phone's? If your phone passcode or Face ID opens it, anyone with your passcode has both.
  3. What happens if you forget it? A clear answer, whether that's account recovery or a recovery phrase, is a good sign the app has thought about where the key lives.

When a Dedicated Vault Is Worth It

A vault app like Vaultine is a lock, not a gate. Files are encrypted on-device with AES-256 and open only with Vaultine's own PIN, separate from your phone's passcode and Face ID. It works the same way on iPhone and Android, plus Mac and Windows, so the same private folder doesn't depend on which phone you have. A Decoy Vault and Duress Vault cover the moments when being asked to unlock is itself the risk, and a 12-word recovery phrase covers a forgotten PIN. Cloud backup is optional and off by default.

If you're on Android and only need one phone covered, Safe Folder is free and a fine place to start. If you're on iPhone, or you want one locked folder that follows you between devices, that's the gap a dedicated vault fills.

The Short Version

iPhone has no built-in folder password: Face ID on the Files app and the Hidden album both use your phone's unlock, and locked notes only cover text. Android has Safe Folder and, on Samsung phones, Secure Folder, both with their own lock but tied to one phone. Whatever you use, check that the files are encrypted and not just hidden, and that the password isn't the one that unlocks your phone.

Try it free with up to 10 files at vaultine.app.