Jul 18, 2012 Convert DMG to CDR or ISO with Disk Utility. It’s important to point out the file extension method typically works fine on a Mac but if you want to use the resulting image to burn a bootable disk, or burn it through Windows or Linux, you’ll probably want to. Nov 16, 2018 Method 2: How to Convert DMG to ISO on macOS (Disk Utility) Mac OS X and macOS offer an easier way to convert DMG to ISO, which is only natural because DMG is the native disk image format used by Apple. The Disk Utility that's built into Mac will help you do the conversion from DMG to ISO. Follow the steps below to convert your disk image files.
So you downloaded an .iso image, and now you want to convert it to .dmg format? How can I convert .dmg to a Windows-compatible .iso on Mac? Don’t bother downloading any third party software, you can easily convert .dmg to .iso or .iso to .dmg format using the Terminal or Disk Utility on Mac OS X.
Method 1: Convert Between .DMG and .ISO Using Terminal

Mac OS X has a command line tool called hdiutil which allows you to create, mount and convert different types of disk image with ease. Here’s how to convert .dmg to .iso format using the Terminal:
hdiutil makehybrid -iso -joliet -o ~/Desktop/filename.iso ~/Desktop/filename.dmgWhen the process finishes, you’ll get an ISO image that is compatible with Windows, Linux, Ubuntu and Mac.
If you need to convert a disk image from .iso to .dmg, just execute the following command in the Terminal window:hdiutil convert ~/Desktop/filename.iso -format UDRW -o ~/Desktop/filename.dmg
Sit back and wait for the process to complete.
Method 2: Convert Between .DMG and .ISO Using Disk Utility
If you want to convert .iso to .dmg, set the Image Format to “compressed” instead. Click on Convert and you’ll have a .dmg file ready to use.
hdiutil makehybrid -iso -joliet -o ~/Desktop/filename.iso ~/Desktop/filename.cdrConclusion
DMG is a disk image format commonly used by Mac OS X, but it’s practically unusable on Windows or Linux platform. After converting .dmg to .iso on your MacOS, you can copy it to any Windows or Linux computer for burning or mounting.
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The final ISO image can be later extracted with AnyToISO or burned on another disk.
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