How to Open Dmg Files on Mac Ventura/Monterey/Big Sur/Catalina [4 Fixes]

To open a DMG file on a Mac, simply double-click the file, which will mount the disk image and allow you to access its contents. Alternatively, you can right-click (or control-click) the DMG file and select "Open" from the context menu. If you want to install the software or program contained within the DMG file, follow the on-screen instructions to complete the installation process.

Workable Solutions	Step-by-step Troubleshooting
Fix 1. Double-click the DMG Files	Double-clicking the DMG files in their location, such as the desktop, etc., will open them directly...Full steps
Fix 2. Use Disk Image Mounter	It's available for download once more. So you can try Mac's built-in tool - Disk Image Mounter...Full steps
Fix 3. Use Mac Terminal Commands	Go to Finder - Applications - Utilities and launch the Terminal application...Full steps
Fix 4. Force Open Dmg Files	A notice that states, "[Name] can't be opened since it was not downloaded through the App Store."...Full steps

Overview: What is a DMG File on Mac

In macOS, app containers are stored in DMG files, similar to a Windows ISO file, which holds the software installation file and is treated like a physical drive, then ejected after opening and dragging the app to the Applications area.

macOS uses DMG files to ensure that downloaded files are not modified and download correctly. A key feature of DMG files is the checksum, which confirms the file's integrity. When you open a DMG file, it automatically mounts and appears in the Locations tab of Finder, alongside physical disks, and also in Disk Utility.

DMG Files on Mac

4 Methods: How to Open DMG Files on Mac

A DMG file is a virtual disk drive, and dragging apps to the Applications folder should be sufficient to install a program from a DMG file on a Mac. However, some Mac users may face difficulties accessing the DMG file, and the process can be less straightforward. Despite this, there are various conditions for Mac users, and the complete guideline for opening and mounting DMG Files on Mac is provided.

Method 1. Double-click the DMG Files

Double-When you click on a DMG file, it will open directly in its location, such as the Download folder or desktop. A verification box will appear with the text "opening-name.dmg", and once the verification process is complete, the DMG file will unlock and be ready to open on your Mac.

Double Clicking DMG Files

Method 2. Open DMG Files Using Disk Image Mounter

If you double-clicked the disk image but couldn't open it on your Mac and received an error message like "No mountable file system," the file may already be corrupted. You can try to download it again. Alternatively, you can use Mac's built-in tool - Disk Image Mounter to troubleshoot the issue.

Step 1. To open a DMG file, right-click or press Command + click on it.

Step 2. To open the DMG file, select the "Disk Image Mounter" option from the list under the "Open With" button.

DMG Files on Mac with Disk Image

Step 3. The content of the DMG file will be directly visible for you to use once it has been mounted.

Method 3. Mount the DMG File with Mac Terminal

To mount a DMG file using Terminal, follow these steps: Drag the DMG file to your desktop, then open Terminal and type `hdiutil attach /Users/your_username/Desktop/filename.dmg` (replace "your_username" and "filename" with your actual username and the name of the DMG file), press Enter, and follow the on-screen instructions to complete the mounting process.

Step 1. Go to Finder > Applications > Utilities, and launch the Terminal application.

Open Terminal to mount DMG Files

Step 2. To change the directory to your Desktop, you can type the command "cd ~/Desktop" into the Terminal window and press the Enter key. This will take you to the Desktop directory, where you can view and interact with the files and folders on your Desktop.

Terminal Command to Open DMG FIle

Step 3. Attach the .dmg file by typing `hdiutil attach filename.dmg` and pressing Enter, replacing "filename.dmg" with the actual name of the .dmg file.

Step 4. After performing the two command lines, your DMG files will now be mounted on your Mac.

Method 4. Open Dmg Files When You See the Error Message

When you double-To resolve this issue, you can click on the "Open Anyway" button to override the App Store verification. This will allow you to install the app, but keep in mind that you may be prompted to enter your administrator password to confirm the installation. Alternatively, you can also right-click (or control-click) on the DMG file and select "Open" from the context menu, which will also bypass the App Store verification.

Then you can carry out these actions:

Step 1. Click the Apple logo in the top-left corner of the screen and then select System Preferences.

Open System Preferences on Mac

Step 2. Select Security & Privacy under System Preferences.

Step 3. In the bottom-left corner of the window, click the lock icon.

Security and Privacy to Unlock DMG Files

Step 4. To update anything on this page, you must enter your password.

Step 5. Select "Anyway", and then open the DMG files.

System Preference to Open DMG Files

Bonus Tips: Recover Deleted DMG Files on Mac

Data loss can occur for various reasons, and DMG files are no exception. Due to frequent data loss, data recovery is often necessary. To recover lost DMG files, a powerful file recovery tool like Deep Data Recovery for Mac can be used.

You can recover DMG files on macOS using robust data recovery software, especially if you've used Mac's Terminal command lines to open DMG files on Mac, which may cause the system to become unresponsive.

Qiling DMG File Recovery Tool for Mac

Recover lost or deleted DMG files with ease using advanced scanning and recovery algorithms that effectively restore your files.
If you've accidentally deleted files from the Trash on your Mac, there's still hope to recover them. DMG files, being disk images, can be recovered using data recovery software, such as Disk Drill or Deep Data Recovery Wizard.
In addition to DMG files, you can recover deleted emails, audio, videos, and Word, Excel, and PowerPoint documents from a Mac computer.

Free Download
Windows 11/10/8/7, 100% Secure

Here is a step-To recover deleted DMG files on Mac, use a professional DMG recovery application such as Disk Drill. First, download and install Disk Drill on your Mac.

Step 1. Select file types

Launch Deep Data Recovery for Mac, select the file types you want to recover, and click "Next" to begin the recovery process.

Select file types that you want to recover

Step 2. Scan for deleted files

Select the hard drive, external drive, or SSD where your important data & files were deleted and click "Search for lost files".

select a location and click search for lost files

Step 3. Filter the lost files

The software performs quick and deep scans on the selected volume, aiming to find as many deleted files as possible. It allows users to filter the results by file type and path.

Step 4. Recover deleted files

Double-To recover deleted files, click on the files you want to recover to preview them, and then click the "Recover" button to restore them.

Bottom Line

Installing software on macOS is relatively easy thanks to the DMG file, but issues may arise when opening a DMG file, especially if it's corrupted or not fully downloaded. To resolve this, you can try one of the four methods mentioned above to open the problematic DMG file. If you've lost files due to the issue, you can use Deep Data Recovery for Mac to try and restore them.

Free Download
Windows 11/10/8/7, 100% Secure

How to Open DMG Files FAQs

Here are 4 additional questions and answers to help you know more about How to open DMG files.

1. How can I open a DMG file on Windows?

DMG files are Mac-The software is only compatible with macOS and Linux systems, and is not intended for use on Windows. If you're using Windows, you can check the website for a compatible software version before downloading the DMG file.

2. What can DMG files on Mac or Windows do?

DMG files benefit from improved compression and encryption, making them a secure and efficient way to store and transfer files. Their primary advantage is that they can be considered detachable disks, allowing users to easily access and utilize their contents without needing to physically attach an external device.
DMG files can be used to read and write data, and they can also be used to add files to them as needed.
Deleting extra DMG files can significantly reduce your PC storage.

3. How to open DMG files on Mac that are not recognized?

Step 1. Find and choose any ".dmg" file.
Step 2. Navigate Finder - File - Get Info.
Step 3. Find the "Open with" section when the "Get Info" window appears.
Step 4. To mount the disk image, select "Disk Image Mounter" from the "Open with:" menu, then click "Change All" and finally click "Continue".

4. Can I delete DMG files after software installation?

You can delete DMG files after installing software, as they become unnecessary and can free up storage space.

If you've unintentionally deleted DMG files, you can try recovering them using a data recovery software. This type of software can scan your device for deleted files and attempt to recover them.