Search for how to password protect a folder on a Mac or a Windows PC and you'll find plenty of tricks. The honest answer is shorter: neither one lets you put a password on a folder. Each has something close, and each version comes with a catch worth knowing before you trust it with anything private. Here's what's built in on both, how to set it up, and when it isn't enough.

On Mac: An Encrypted Disk Image Is the Closest Thing

Finder has no folder password. What macOS does have is Disk Utility, which can create an encrypted disk image: a single file that holds your files and asks for its own password whenever you open it. Apple's own steps for a secure disk image:

  1. Open Disk Utility (Applications > Utilities).
  2. Choose File > New Image > Blank Image.
  3. Give it a name and a size big enough for what you'll store, and choose APFS as the format.
  4. In the Encryption menu, choose 128-bit AES or 256-bit AES, then enter a password twice.
  5. Set Image Format to read/write, so you can keep adding files later, then click Save.
  6. Open the new image, copy your files into it, and eject it when you're done.

You can also use File > New Image > Image from Folder to wrap an existing folder in one step. If you do, pick an image format you can write to, or the result will be read-only.

Three catches before you rely on it:

  • The original folder isn't touched. Your files are now in two places, one encrypted and one not. Delete the originals and empty the Trash once you've checked the image opens.
  • It stays open until you eject it. While the image is mounted, anyone using your Mac can browse it like any other disk.
  • There's no password reset. Apple warns that if you forget the password, you won't be able to open the image or see any of the files.

FileVault is worth turning on as well, but it's a different thing: it encrypts the whole startup disk and opens at login, so it doesn't give a folder its own password. The only other built-in password on a Mac is a locked note in the Notes app, which is made for text, not folders of files. How to Encrypt a Folder on Mac goes deeper on Disk Utility and FileVault.

On Windows: No Folder Password at All

Windows has no built-in way to give a folder a password. What it offers depends on your edition:

  1. EFS on Pro, Enterprise and Education. Right-click the folder, choose Properties > Advanced, and check Encrypt contents to secure data. The files are genuinely encrypted, but there's no separate password: they open for whoever signs in to your Windows account. If you're signed in and step away, so is everyone else who sits down.
  2. Nothing folder-level on Home. Microsoft states that file encryption isn't available in the Home edition. Home can encrypt the entire drive with Device Encryption on supported hardware, but that only protects a PC that's off or not yet signed in.
  3. Not a zip file either. File Explorer can create ZIP files, and recent Windows 11 versions handle 7z and TAR too, but Microsoft says it doesn't support encrypted archives and points to third-party apps for that. Microsoft also warns that EFS-encrypted files lose their encryption when they're zipped and later unzipped.

Marking a folder as hidden doesn't help either. A hidden folder is still an ordinary folder that opens for anyone who turns on hidden items. How to Encrypt a Folder on Windows covers BitLocker and EFS step by step.

The Question to Ask: Lock or Just a Gate?

A password on a folder only means something if it actually decrypts the files. That splits every option, built in or third-party, into two kinds:

  • A real lock. The files are encrypted, and the password is what opens them. Copy them somewhere else and they're still unreadable. Disk Utility's encrypted image is this kind.
  • A gate. The files are ordinary, just moved, hidden or put behind a login screen. EFS is encrypted, but its gate is your Windows sign-in, so anyone who has that has the folder too.

The same test applies to the many folder lock apps for Mac and Windows: check that they say the files are encrypted on your device, not just hidden, and that the password is separate from your computer login. How to Password Protect a Folder on iPhone and Android runs the same check on phones, and Why the "Hidden" Folder Isn't Really Hidden explains why hiding isn't protection.

When a Dedicated Vault Is Worth It

If you're on a Mac and comfortable opening and ejecting a disk image, Disk Utility is free and genuinely encrypted. If you're on Windows Home, or you want a password that isn't your Windows login, there's no built-in answer, which is the gap a vault app fills.

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 Mac or Windows login. It runs on macOS and Windows, plus iPhone and Android, so the same private folder works across your devices instead of living in one .dmg on one Mac. A Decoy Vault and a 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.

The Short Version

Mac has no folder password, but an encrypted disk image from Disk Utility comes close: real encryption with its own password, as long as you delete the originals, eject it when you're done and never lose the password. Windows has no folder password at all. EFS on Pro editions encrypts a folder but opens with your Windows login, and Home has no folder-level option. Whatever you use, check that the files are encrypted and that the password isn't the one that unlocks your computer.

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