How To Decompress Dmg File On Mac

Compress or uncompress files and folders on Mac. Compressed files take up less disk space than uncompressed files, so compressing is useful for making backup copies of your data or for sending information over the internet.

DMG files are containers for apps in macOS, from which you can install software fast. Installing software simply requires you to open the .dmg file and then drag the application to your Mac’s Application folder. That’s much easier than using an Install Wizard in Windows. However, some of Mac newbies have no idea how to mount .dmg files in macOS or for some reason the .dmg file cannot be opened. Now this page will show you three methods to open and mount .dmg files on macOS.


Method 1: Open .dmg file with DiskImageMounter

DiskImageMounter is the utility that handles mounting disk images in Mac OS X. Normally you can mount a .dmg file on Mac by simply double-clicking it or right-clicking on it and selecting Open With > DiskImageMounter (default). However, some people report that .dmg files cannot be opened on Mac in this way. If that’s the case, move on to another method.

Method 2: Mount .dmg file from Mac OS Terminal

Dmg File Mac

Place the .dmg file on your Mac’s desktop and then follow the steps.

Step 1: Open Terminal on your Mac. If Terminal is not on the Dock, open it from Finder > Applications > Utilities.

Step 2: Type cd ~/Desktop and press Enter key.

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Step 3: Type hdiutil attach googlechrome.dmg and press Enter key. Replace googlechrome with your .dmg file name.

That’s it. After you execute the two command lines, the .dmg file will be mounted on your Mac.

Method 3: Mount .dmg file using iSumsoft Bitlocker Reader for Mac

If you cannot open .dmg files on your Mac using either of the first two methods, it’s a good idea to use a third-party utility like iSumsoft Bitlocker Reader for Mac. iSumsoft Bitlocker Reader for Mac is mainly to help unlock BitLocker-encrypted drive on Mac, but it also comes with the Attach feature that can attach disk image on Mac. Here are the simple steps you can take to mount .dmg file using iSumsoft Bitlocker Reader for Mac.

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Step 1: Download and install iSumsoft Bitlocker Reader for Mac on your Mac computer. After the installation is complete, launch it from the Launchpad.

Step 2: Click the Attach button.

Step 3: Browse for the .dmg file and select it, and then click Open.

That’s it. The .dmg file is now mounted successfully on your Mac and you can open it. You can also click the Unmount button to unmount the disk image from your Mac if you want.

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Files you download from the Internet are often compressed or zipped so that they take up less space and arrive much faster than files that haven’t been compressed. You can easily identify compressed files by their extensions, such as .zip (a common standard used in OS X and Windows) and .sit. Before you can use these files, you must learn how to unzip files on mac computers for proper access – luckily the process isn’t that complicated!

How to unzip files on mac computers

Unzipping a file on a mac computer is user-friendly and intuitive. To unzip files on a mac, simply follow the steps below:

  1. Double click the zipped file.
  2. The file will automatically be decompressed by Archive Utility into the same folder the compressed file is in.
  3. Access the extracted files by clicking the appropriate icons.

Hdiutil attach on path to your.dmg drive. Alternatively, if the method above does not work, you can right-click on the .zip package, and select Open With > Archive Utility (default).

Apple and third party software

Apple used to include a program called StuffIt Expander to decompress zipped files, but doesn’t now that OS X lets you unzip files (but not .sit files). However, StuffIt from SmithMicro Software still comes in handy for opening other types of compressed files, notably the .sit or .sitx compressed types. Go to www.stuffit-expander.com or www.stuffit.com/mac/index.html to download a free version of the software or to splurge for the Deluxe version. In addition to compressing files, StuffIt Deluxe lets you encrypt and back up files.

Meanwhile, you can archive or create your own .zip files through OS X, which is useful if you’re e-mailing a number of meaty files to a friend. Right-click (or Ctrl-click) files you want to compress inside Finder and choose Compress Filename. The newly compressed files carry the .zip extension. The archive is created in the same location as the original file and is named originalfilename.zip. You can also choose File→Compress. If you compress a lot of files at once, the archive takes the name Archive.zip.

By default, compressed files are opened with the Archive Utility. It appears in the Dock (in Leopard) while the files are being unsqueezed, unless you choose to open them with Stuffit Expander or some other program.

How to zip files on a mac

On the flip side, you can also archive or create your own .zip files through OS X, which is useful if you’re e-mailing a number of meaty files to a client or friend. Follow the step-by-step instructions below to easily zip files on a mac:

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  1. Right-click or Ctrl-click the multiple files you want to compress (whether on the desktop or inside the Finder).
  2. Select Compress Filename from the pop-up menu.
  3. The files are now compressed in a .zip extension and the archive is created in the same location as the original file name, except with the .zip appended to its name.

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How To Decompress Dmg File On Mac

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On some Apple computers, you can also compress a file by simply choosing File→Compress. If you compress a lot of files at once, the archive takes the name Archive.zip.

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