Investigation and Security Blog

How to Password Protect a MAC Folder

How to password protect a folder on Mac:

Assigning a password to files and folders hides/locks the contents of your file or folder from anyone wanting to open it and thereby secures it with a password. ***Please note--once you have a password protected folder or file, don't forget it, because there is no way to recover it. There are different steps for creating a password protected file and folder.

Here are the simple steps for a password protect folder of a disk image (DMG) on a MAC. Placing files or images within this folder will automatically password protect the files/images within the folder. For this lesson, the folder "macReports" will be used.

1. Open Disk Utility (Applications / Utilities / Disk Utility).

2. In Disk Utility, go to File > New Image > Image from Folder…

3. Now, select the folder you want to password protect. In our example, it is the macReports folder, and click Choose

4. Save this new folder as anything you want and Select where you want to save this folder.

Encryption, Select "128-bit AES Encryption (Recommended)" and image format, Select "read/write."  At this time, of encryption selection, you will be asked to enter the password.

Enter your desired password and Click Choose.

5. Click Save.

Disk Utility will say "Creating folder disk image "macReports.dmg". When it is completed, Click Done. Now, you may want to delete the original folder. 

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