Download macOS ISO Files (Verified Methods + Real Test Results)

Do You Actually Need a macOS ISO? (Quick Decision Check)

Use ISO if: 

✅ Running macOS in a VM 

✅ Creating bootable media from non-macOS environments 

Do NOT use ISO if: 

❌ Installing macOS on a Mac (use installer directly) 

Why You Should NOT Download macOS ISO Files Online?

Downloading macOS ISO files from unofficial websites may seem convenient, but it comes with serious risks that can affect both your system's security and stability.

• Modified systems: Unofficial ISOs may be altered to include unwanted changes, hidden scripts, or pre-installed software you didn't ask for.
• Missing updates: These files are often outdated or incomplete, lacking important security patches and system components.
• Malware and security threats: Some downloads may contain malicious code, putting your personal data and system at risk.

To ensure a safe and reliable installation, always download macOS from official Apple sources or using a trusted tool that automates the process safely.

Method 1 (Recommended): Create macOS ISO from Official Installer (Tested)

If you already have the macOS installer app on a Mac, you can manually create an ISO file using Terminal.

• This method works if:
• ✅ You have a Mac that's compatible with the macOS version you need.
• ✅ You can deal with Terminal commands.
• ✅ You don't mind spending more time or facing potential errors.

Basic Workflow:

Step 1: Download the official macOS full installer

To make the macOS ISO file, you'll need to download the macOS full installer first. For macOS High Sierra and later, you can get it from the App Store. For macOS Sierra and earlier versions, download the DMG file and then double-click to expand it until you install the macOS installer to the Applications folder.

Download the latest macOS Tahoe full installer here

Step 2: Make an empty ISO disk image in Terminal

Then you can proceed to create an empty disk image to accommodate the bootable USB installer. To do it, open Terminal and run the following command:

hdiutil create -o /tmp/Sonoma -size 15979m -volname Sonomaiso -layout SPUD -fs HFS+J -type UDTO -attach

This command makes a new, 15979 MB disk image with the file system Mac OS Extended (Journaled) in the /tmp directory with the name "Sonoma," and of the type suitable for creating CD/DVD ISOs.

If you're creating an ISO file of a different macOS, change "Sonoma" to the desired system.

Step 3: Create a bootable macOS installer

To make the ISO file bootable, you'll also need to turn the macOS full installer into a bootable copy. Copy and paste the command for your macOS version and execute it in Terminal.

sudo /Applications/Install\ macOS\ Tahoe.app/Contents/Resources/createinstallmedia --volume /Volumes/ISOsudo /Applications/Install\ macOS\ Sequoia.app/Contents/Resources/createinstallmedia --volume /Volumes/ISOsudo /Applications/Install\ macOS\ Sonoma.app/Contents/Resources/createinstallmedia --volume /Volumes/ISO sudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia --volume /Volumes/ISOsudo /Applications/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia --volume /Volumes/ISOsudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/ISOsudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/ISOsudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/ISOsudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/ISO

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/ISO --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app

The command runs with administrative privileges, requiring your account login password. Type the correct password (it won't echo to the screen) and press Enter to send it.

Step 4: Unmount the disk image and convert it into ISO

Once the macOS install media is created, unmount it and convert it from .cdr to .iso with the following commands (Replace Sonoma with your macOS version):

hdiutil detach -force /Volumes/Install\ macOS\ Sonoma 
mv /tmp/Sonoma.cdr ~/Desktop/Sonoma.iso

Step 5. Test the ISO in a Virtual Machine

After the ISO file is created, I tested it in VMware Fusion on my MacBook Air. It booted successfully without errors.

⚠️ This method is error-prone and not recommended for inexperienced users.

Common Errors & Fixes (Real Cases)

Method 2: Easier Workflow Using a GUI Tool (Beginner-Friendly)

• When this makes sense:
• ✅ No Terminal experience 
• ✅ Uses Apple's official distribution channels
• ✅ Eliminates the risk of corrupted or modified installers
• ✅ Working on Windows & macOS
• ✅ Want fewer manual steps

iBoysoft DiskGeeker is recommended if you want to download the macOS ISO file on a Windows PC directly or make an ISO file on a Mac with fewer steps. 

What the tool actually does (demystified):

macOS Versions Available for Download in This Tool:

Choosing the right macOS version depends on your hardware, compatibility needs, and use case. Use the table below as a practical reference:

Tip: If you're unsure, choose macOS Sonoma for the best balance of stability, compatibility, and modern features.

Download macOS ISO on Windows

On a Windows PC, you can download the targeted macOS ISO file directly and then use it for virtual machines, installing macOS on a PC, or creating a macOS bootable installer on Windows.

Step 1: Download, install, and open iBoysoft DiskGeeker for Windows.

Step 2: Open Download and create boot disk > Download macOS system image.

Step 3: Choose the needed macOS version and click Get.

Step 4: Select the .iso format.

Step 5: Save the Mac OS ISO file to a desired location.

Reminder: If you need a macOS bootable USB installer, choose Create macOS USB installer in Step 2 instead.

Share this tool to benefit others!

Download macOS ISO on Mac

On a Mac, you can download the macOS installer and then convert it into an ISO file for virtual machines or deployment. Follow the steps below:

Step 1. Free download and open iBoysoft DiskGeeker for Mac.

Step 2. Select an internal partition and click Download Image.

Step 3. Select the macOS version you want and click Get.

Step 4. After the file is downloaded, open Terminal.

Step 5. Run the hdiutil command below to convert the .dmg file to a .cdr file. (Remember to replace dmg_file_path with the actual path and xxx with the macOS version name.)hdiutil convert dmg_file_path -format UDTO -o ~/Desktop/xxx.cdr   
Type hdiutil convert, leave a space, then drag and drop the .dmg file to Terminal to get its file path, then leave a space, copy and paste -format UDTO -o ~/Desktop/xxx.cdr into Terminal, and hit Enter. The final command may look like: hdiutil convert /Users/jenny/Desktop/macOS\ 15\ Sequoia.dmg -format UDTO -o ~/Desktop/Sequoia.cdr

Step 6. Rename the .cdr file to an .iso file.mv cdr_file_path ~/Desktop/Sequoia.iso   
Type mv, leave a space, then drag and drop the .cdr file to Terminal to get its file path, leave a space, then type in ~/Desktop/xxx.iso and press Enter. The final command may be similar to: mv /Users/jenny/Desktop/Sequoia.cdr ~/Desktop/Sequoia.iso

Step 7. Find the macOS ISO file on your desktop.

In testing on macOS Sonoma (MacBook Air), the hdiutil convert step took ~6 minutes for a 16.14GB installer and produced a 17 GB .cdr file. After renaming to .iso, the file booted successfully in VMware 17.

Common failure:

Error: "resource busy" → occurs if the volume isn't detached properly

Fix: run hdiutil detach -force /Volumes/Install macOS before conversion 

Share this tool to help others download the macOS, OS X, or Mac OS X ISO file!

Final Verdict

If you need macOS ISO files, the safest approach is to download official macOS installers on a Mac and convert them properly. However, if you only have a Windows PC, download them directly with a reliable tool.

iBoysoft DiskGeeker simplifies this process by providing direct access to verified macOS installers without unsafe third-party downloads. It supports multiple macOS versions, reduces manual errors, and ensures system integrity. For both beginners and professionals, it is the most reliable starting point for macOS ISO creation.

If you want to learn more about the ISO file of each macOS version, check out the following guides:

Download/Create macOS Sonoma ISO File for VMware or VirtualBox

Download/Create macOS Ventura ISO File for VMware or VirtualBox

Download/Create macOS Monterey ISO for VirtualBox/VMware

Download/Create macOS Big Sur ISO for VirtualBox/VMware

Download/Create macOS Catalina ISO for VirtualBox/VMware

Download/Create macOS High Sierra ISO for VirtualBox/VMware

Frequently Asked Questions