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How to convert DMG to ISO and ISO to DMG on macOS

Published: 03 November 2009
Updated: 26 April 2020
Filed Under: macOS

The utility hdiutil is used to manipulate disk images. This includes creating disk images, mounting and unmounting disk images, and burning a disk image, it can also be used to convert different image types. In order to convert a DMG image to an ISO disk image, run the following command from the terminal. Be sure to change Filename to the correct file name. The command right below that removes the added '.cdr' that the utility automatically appends.

Convert DMG to ISO

hdiutil convert Filename.dmg -format UDTO -o Filename.iso
mv Filename.iso.cdr Filename.iso

Convert ISO to DMG

If you need to convert ISO disk images to a DMG image, run the following command from the terminal.

hdiutil convert Filename.iso -format UDRW -o Filename.dmg