How to Create Bootable USB from DMG Mac🔥

Learn to create bootable USB from DMG Mac directly with specific steps on this page. Besides, you can also create a bootable USB for Mac using EaseUS Partition Master for Mac.

Creating a bootable USB from a DMG file on a Mac is one of the most effective ways to install or repair macOS, recover data, or upgrade multiple systems without needing an internet connection. Whether you're a macOS power user or just trying to reinstall your system, a bootable USB can save hours of troubleshooting and downloading time.

A DMG file (Apple Disk Image) contains the full macOS installer or system files. By writing this DMG onto a USB drive, you can turn it into a bootable macOS installer — essentially a portable macOS setup tool.

In this guide from EaseUS, we'll explore three proven methods to create a bootable macOS USB drive from a DMG file.

Why Create a Bootable USB from a DMG File

A bootable USB drive offers flexibility and reliability that standard online installers don't. With one, you can:

What You'll Need

Before you begin, make sure you have the following:

• A USB drive (at least 16GB, preferably 32GB for modern macOS versions).
• A macOS DMG installer (from Apple's official site or a trusted source).
• A Mac or Windows computer for preparation.
• Some free storage space and patience — the process can take 10–30 minutes, depending on your motherboard.

Method 1. Use EaseUS Partition Master for Mac

If you prefer an easy, graphical, and reliable solution, EaseUS Partition Master for Mac is the best choice. It eliminates the need for command-line tools, allowing you to create a bootable macOS USB drive in just a few clicks.

Key features of EaseUS Partition Master for Mac:

• 100% visual interface, no Terminal commands required
• Supports DMG, ISO, and IMG installer formats
• Prevents errors caused by incorrect disk identifiers

Note: This procedure will automatically erase your USB drive to a compatible format. Due to all data on the USB drive will be erased during the process, create a backup if needed.

Step 1. Connect an external disk like a USB drive to your Mac.

Step 2. Launch EaseUS Partition Master for Mac and navigate to the macOS Installer Creator.

Step 3. Select the macOS you want and the tool will download it from Apple automatically. Also, you can use the local pkg package if you already have one on your device.

Step 4. Then, select the target USB drive to create a bootable media.

Step 5. Finally, perform the operation and wait patiently till the macOS installer is created successfully.

Step 6. Once the bootable installer creation is completed, you can restart your Mac from the USB drive for new macOS installation.

For Apple Silicon Macs:

• Shut down your Mac and press and hold the power button until you see the startup options window.
• Select the bootable installer drive and click "Continue."

For Intel Macs:

• Restart your Mac and immediately hold the "Option (Alt)" key.
• Release the key when the Startup Manager appears.
• Select the bootable installer drive and press "Return."

Method 2. Create a Bootable USB from DMG using Terminal

If you prefer Apple's built-in approach or want full control over the process, you can use Terminal and the official createinstallmedia command. This method works perfectly for DMG files that contain a full macOS installer app, such as Install macOS Sonoma.app.

Step 1. Format Your USB Drive: 

• Connect the USB drive to your Mac > launch Disk Utility > select your USB drive > click Erase. 
• Choose Mac OS Extended (Journaled) as the format > set GUID Partition Map as the scheme.
• Name it > click Erase to confirm.

Step 2. Use the CreateInstallMedia Command:

• Open Terminal and type:
• sudo /Applications/Install\ macOS\ Sonoma.app/Contents/Resources/createinstallmedia --volume /Volumes/MyUSB
• Replace Sonoma with your macOS version and MyUSB with your USB's drive letter. 
• Enter your admin password when prompted. Please wait patiently, as this process may take several minutes while macOS copies and configures the installer.

Step 3. Boot from the Installer USB:

• Insert the USB into your Mac > restart while holding Option > choose the USB drive to begin installation.

Final Thoughts

Creating a bootable USB from a DMG file on Mac is an essential skill that every Mac user should know. Whether you prefer the one-click simplicity of EaseUS Partition Master for Mac or the power and flexibility of Terminal, both methods will help you prepare a reliable installation drive.

If you're new to macOS or don't want to risk using command lines, EaseUS Partition Master for Mac is the fastest, safest, and most beginner-friendly choice. It handles all the technical steps for you and works seamlessly with both DMG and ISO files.

But for users who love precision and control, the Terminal and dd methods remain excellent options. No matter which route you choose, you'll end up with a bootable USB drive that can reinstall, repair, or upgrade macOS — anytime, anywhere.