File Encryption & Folder Encryption — Choose Your Security Level — Decrypt All Files — Choose a secure password — Encrypt How to create encrypt files on Mac — Disutility Step 1. Create a .DMG disk image. How to extract encrypted files from a file using the Mac Disk Utility Step 1. Select the name of the file you want to extract; Step 2. Go to Disk Utility → macOS → File Manager → Browse to folder — Select file — Select the image file you just created from the Disk Utility window — Select Browse — Browse to the folder that you want to extract the files to — Select Extract [This works the same in Windows] — Exclude the selected file. How to decrypt encrypted disk image using Disutility Step: 1. Open Disk Utility, 2. Select File > Select the image file you want to decrypt; 3. Enter the password you chose; and 4. Click decrypt disk image.