Apple delivers the macOS installer and applications through the app store since the launch of OS X Lion. The macOS installer has a .app extension when you get it through the official channel. Unlike the macOS DMG installer, which Apple doesn’t provide nowadays, the app version of the macOS install package is not bootable. Hence it is not mountable nor compatible with operating systems like Windows. For some reason, if you want macOS in .DMG or .ISO format, there is a method to convert the .app file. Unfortunately you need a macOS system to convert .app to .dmg to .iso image.
Reasons for converting macOS Mojave or High Sierra .app to .DMG or .ISO
The macOS in DMG format let to quickly create Install DVDs and bootable USB installers in a few minutes.
When you convert macOS Install .app to ISO format, you may use it for running macOS on Windows PCs (Hackintosh).
You can use the DMG file made from the macOS Install app for creating a boot-friendly macOS USB on Windows PC.
The DMG file can be burned to a CD or mount as a normal volume on Macintosh computers. Usually, the data in DMG file is stored in compressed format. On a Windows PC, AnyBurn can convert DMG file to ISO format, or burn it to a blank CD / DVD disc. To convert DMG file to ISO format, please follow the steps, 1. Run AnyBurn, and click 'Convert. Jul 15, 2019 Open the Power ISO and click File and then click on open ISO file. Click on the Properties and then select the Apple Disc Image. Click on the File icon and save it from the drop down menu and click Save. The ISO file is converted to DMG and ready to use. Part 3: Convert DMG to ISO and Burn ISO to USB In certain instances, you may want to use a Windows computer instead of a Mac, which means you won't have the disk utility. Besides, Windows can't natively handle DMG files, so you will need to convert it into an ISO disk image that Windows can work with. Open Finder and then open Disk Utility by clicking Go Utilities Disk Utility; When Disk Utility opens, click the Convert icon on the toolbar; When prompted, browse to the ISO file you would like to convert, select it and click the Convert button; Now you will be prompted for a name. Ensure you give it a name with the extension.dmg. Convert an ISO file to DMG format. Hdiutil convert /path/imagefile.iso -format UDRW -o /path/convertedimage.dmg. This tip is particularly useful if you have a CD/DVD burner on a Mac (or PC) and not a PC (or Mac) and you need to burn a disk image using the other machine.
Above all, DMG and ISO files are highly portable; it is easy for anyone to upload and transfer them through the Internet.
Convert macOS Installer .APP to .DMG bootable image
The requirement for running macOS, and a USB Pen Drive for converting the Installer application to bootable ISO or DMG image. The step by step process for converting macOS Mojave, High Sierra, Sierra, EI Capitan to the bootable .DMG or .ISO is explained below.
First of all, download the full Mac OS installer, and save it in the Applications folder.
Next step is to create a bootable USB installer from macOSÂ Install app. I prefer using the macOS Terminal app to create the bootable USB Installer using commands in the screenshots.
Now, copy the contents of the macOS USB to a new folder and give it a single word name. We are going to make DMG file on Mac from the newly created folder.
Then open the Disk Utility app and then take the “File” menu from the top left corner. Then New Image and Image from folder, and direct the Finder to the macOS file folder.
Choose the image format as Hybrid (HFS+/ISO/UDF).
The system now starts converting the macOS installer .app bootable .DMG file.
The output is a boot-friendly DMG image which you could restore to a USB or DVD drive from Windows or macOS. It is also possible to burn this DMG file to a DVD or USB Pen Drive from Windows PCs using software like Transmac.
Just in case you find any difficulty, check our video on converting macOS .app to bootable .dmg.
How to convert macOS installer to iso format
There are several ways to convert macOS .app to .ISO bootable image. Usually one need to do APP to DMG or CDR conversion before making it an ISO file on Mac. The Disk Utility app in macOS previously had an option that allows you to convert DMG to ISO/CDR. You can use Terminal and third-party apps to convert Mac OS installer to ISO if it is in CDR format.
AnyToISO app capable of converting macOS DMG to iso format. The free version of AnyToISO doesn’t support converting dmg files above 850 MB. Hence, you need to either purchase or download (Search AnyToISO Pro 3.9.0 in Google) the PRO version of this app.
Convert Dmg To Iso Mac
In my experience, converting DMG to ISO with AnytoISO takes a lot of space and resources if you’re on macOS machine. The system shows out of space notification even though you have enough space left in the disk. Therefore, it is better to transfer the DMG files to a Windows machine and use freeware like DMGtoISO or AnyBurn for converting. Check our page on burning DMG on windows for freeware tools supporting DMG to ISO conversion.