How to Password Protect a Folder on Mac (3 Easy Ways)

If you're a Mac user handling sensitive files—whether personal documents, client projects, or private research—you've probably wondered how to lock a folder with a password. While macOS includes some built-in options, they are either hidden behind advanced tools or too broad, like full-disk encryption. In this guide, we'll show you three effective ways to protect individual files and folders: Disk Utility, the Terminal command line, and Finderlock, a native Mac app designed for seamless file security.

Method 1: Using Disk Utility (built-in but clunky)

Apple includes Disk Utility, which lets you create an encrypted disk image of a folder.

1. Open Disk Utility.
2. Go to File > New Image > Image from Folder.
3. Select the folder you want to protect.
4. Choose "128-bit" or "256-bit AES encryption" and set a password.
5. Save the .dmg file.

Method 2: Using Terminal (powerful but not user-friendly)

Advanced users can use the hdiutil command to make an encrypted sparsebundle:

hdiutil create -encryption -stdinpass -size 100m -volname "Secure" -fs APFS -type SPARSEBUNDLE ~/Desktop/Secure.sparsebundle

This creates a protected bundle where you can drop files.

Method 3: Using Finderlock (the simplest, most Mac-native way)

Finderlock was built for people who want true file-level protection without the friction. Instead of creating manual disk images or fiddling with Terminal, Finderlock integrates directly into Finder with right-click options.

• Choose "Protect with Finderlock" from Finder.
• Secure it with Touch ID or a password.
• Files auto-lock after inactivity, sleep, or logout (depending on your plan).

Key Finderlock Features

• AES-256 encryption
• Password or Touch ID authentication
• Auto-lock timers and smart rules
• Menu bar dashboard
• Secure file shredder (Pro)
• Local-only operation (files never leave your Mac)

Conclusion

If you only need occasional folder encryption, Disk Utility or Terminal can get the job done, though with inconvenience. But if you value speed, simplicity, and a truly Mac-native experience, Finderlock makes protecting sensitive files effortless. Start free with up to three protected items, and upgrade anytime for advanced features and unlimited protection.

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