Mac os disk image encryption

Save As: Enter the file name for the image.

How to Create Encrypted Disk Images in MacOS

Do not include any file extension; Disk Utility will add the correct extension during the creation. Enter any Finder tags for the image file. This option is only available with OS X Mavericks or later. Use the dropdown menu to select a location for the file.


  • Create a disk image using Disk Utility on Mac?
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  • Instructions For Setting Up An Encrypted Disk Image.
  • How to create a Mac encrypted disk image!
  • Creating an Encrypted Disk Image on macOS!

You can also use the chevron next to the Save As: OS X El Capitan and later uses the standard Save As dialog box, though you can use the dropdown menu method by clicking the chevron icon. Use the dropdown menu to select a size for the image. The dropdown menu is prepopulated with sizes commonly used. You can also select the Custom option in the menu and enter any size you wish.

Creating an encrypted disk image on a Mac

Disk images need a format to use just as drives need to be formatted. Pick a format appropriate for the computer where the image file may be used. Use the dropdown menu to select one of the standard drive formats to use for the disk image. This format applies to the image file and not the mounted image. Use the Partition Map dropdown list to select one of the available partition types to use.

Early versions of the disk image tool included a password strength bar graph.

How to Create Encrypted Disk Images in MacOS

Later versions only show the strength graph when the lock key icon is used for generating a password. Create a New Image from a Folder Disk Utility also allows you to create a new image that will contain the contents of a folder you select. This allows you to bypass the process of adding files to an image manually after the image is created. The process is nearly identical to the one used for creating a new blank image. The differences are outlined here:. A window will open, allowing you to browse to and select a folder to use for the new image.

The difference is in the Image Formats you can use:. When you convert a disk image or create a disk image from a folder, the image formats available are limited. Disk Utility can convert an existing disk image to the following formats:. To convert a disk image, first make sure the image is unmounted, then launch Disk Utility and select Images, Convert.

In the Convert window that opens, browse to the location of the image file you wish to convert, select the image, and then click the Convert button. The Convert dialog box is, in many aspects, just a mini version of the image creation window. Note that you can choose from a number of image formats that make your disk image more flexible. Click the Image Format menu and you can choose a sparse or sparse bundle disk image. These two formats are quite similar, but for our purposes we will choose a sparse disk image. With a sparse image, you can add more files to the disk image, and it will resize itself.

This is the best choice if you plan to alter the contents of the disk image. Next, click the Encryption menu and choose either bit or bit encryption. The latter is twice as strong, but may require a bit more processing power. Given the speed of today's Macs, you are better off choosing bit encryption. Disk Utility will ask you to enter a password. Make sure you remember this password; you will be able to add it to your keychain later.

Click Save, and Disk Utility writes the disk image to the selected location. If you have created a very large disk image, this may take several minutes.

How to Create an Encrypted Disk Image to Securely Store Sensitive Files on a Mac

When this operation is completed, Disk Utility will alert you. Now, go to the Finder, and double-click your disk image. The file looks like this and has the extension. The Finder asks you to enter the password that you entered when creating the disk image. Creating a new blank image will essentially allow you to digitally allocate hard drive space for a specific usage, such as storage or privacy of your data.

Create a blank disk image for storage

The next screen will give you all of the options for your new disk image including name, partition scheme , and encryption. Name your new Disk Image what you would like, choose where it will reside and then designate the size and then choose your encryption. Encryption is the first line of defense against anyone trying to break into your files and Apple provides both bit and bit AES encryption for their disk images.

Both encryption levels authenticate with a password so create a password that is difficult to guess yet easy for you to remember.

It can also recommend a password for you by clicking the key icon and opening Password Assist. After you create your password, you will be able to save your disk image and begin dragging content to it.