Files with dmg extension are almost always  disk images for Mac OS X (macOS). Replaced previously used IMG format, but work pretty much the same as standard ISO images.

There is one other file type using
the DMG file extension!

empty icon.dmg - Oracle binary format dump data

Detailed description

Software that open dmg file

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DMG file extension - Apple Mac disk image

What is dmg file? How to open dmg files?

File type specification:

Disk image (ISO) binary file type icon Disk image (ISO) binary file type

dmg file icon: dmg filetype icon

File extension dmg is associated with disk image files created for Mac OS X (macOS).

DMG file format is used for mountable disk images, which can be opened (mounted) with the Finder a default file manager included in OS X (macOS).The dmg files can also be mounted in most popular emulation utilities.

Apple DMG format is one of the most used format to install new applications to the Mac OS X (macOS). The dmg file type is a replacement for the older IMG format used in Mac OS Classic and is not compatible with Mac OS 9 or earlier.

By default, Apple Disk Image DMG file uses Universal Disk Image Format (UDIF) to store data, but it can use another file systems, like HFS, HFS+, FAT, UDF, or old New Disk Image Format (NDIF) compatible with Mac OS 9. This feature facilitates for example creation of hybrid optical media with multiple file systems for various platforms.

It can be protected by password (AES-128, or AES-256 encryption) as well as compressed by some compression formats (ADC, Zlib, bzip2).

DMG MIME type:

Updated: November 8, 2023

The default software associated to open dmg file:

7-zip icon

Igor Pavlov logo7-zip  Microsoft Windows software

Company or developer:
Igor Pavlov

A free file archiver developed by Igor Pavlov featuring higher compression ratios with LZMA and LZMA2 compression.

It is mainly available for Windows platform (for Mac and Linux are available command line tools) and is the primary program to handle 7z archives. However, also supports various compression file formats.

Supported formats:

Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM


AnyToISO icon

CrystalIdea Software Inc. logoAnyToISO  Microsoft Windows software

Company or developer:
CrystalIdea Software Inc.

AnyToISO is disk image converting tool. It is able to extract and convert variety of popular disk image formats, such as NRG, MDF, UIF, DMG, BIN, DAA to ISO disk image format. It is available in ten languages.

Apple Disk Utility icon

Apple, Inc. logoApple Disk Utility  Apple macOS / Mac OS X software

Company or developer:
Apple, Inc.

A disk utility distributed with Mac OS X / macOS operating system, Apple Disk Utility offers tool for configuration and format of new disk partitions, mount disk images, create, burn, or convert disk images.

Apple Finder icon

Apple, Inc. logoApple Finder  Apple macOS / Mac OS X software

Company or developer:
Apple, Inc.

Finder is the native file management utility in macOS (OS X) operating system. With Finder you can browse your computer directory structure, search files, work with files, do basic file/folder operations (copy, paste, remove, delete, rename etc.), mount disk images, connect to other computers on network, burn files etc.

macOS icon

Apple, Inc. logomacOS  Apple macOS / Mac OS X software

Company or developer:
Apple, Inc.

macOS is Unix-based desktop operating system, a successor of Mac OS X system for MacBook-family, iMac, Mac Mini and Mac Pro computers, developed and sold by Apple, Inc.

Mac OS X icon

Apple, Inc. logoMac OS X  Apple macOS / Mac OS X software

Company or developer:
Apple, Inc.

OS X or Mac OS X is Unix-based operating system developed by Apple Inc. for Macintosh computers. It contains basic core applications for everyday use, such as Finder basic file manager, Safari for Internet browsing, QuickTime for video, iTunes for managing audio data and iPod, iOS devices management , iMessage instant messaging, Mail, Contacts, Calendar and many more.

The latest version 10.11 of OS X is called El Capitan. It is available to purchase on Mac App Store as well as is distributed with new Mac computers and notebooks. It includes features to improve the security, performance, design and usability.

OS X operating system was replaced by new macOS in 2016!

FreeDMG icon

FreeDMG  Apple macOS / Mac OS X software

Company or developer:
Kelley Computing

FreeDMG is utility used to create Apple DMG disk images. With this software it is possible to quickly perform disk imaging on the fly. Both the program's window, and the dock icon can be used for drag-and-drop imaging.

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Convert any disk image file format to ISO

Help how to open:

On Mac you can open/mount DMG images in all related programs, because it' native Mac format.

Apple Disk Images are also open-able in various apps in Microsoft Windows, like 7-zip, PeaZip, DMGExtractor, etc., but apps (*.app files) stored in them cannot be run, because they are written for OS X (macOS) system. Documents, pictures, videos and multimedia files can be opened in compatible Windows apps.

How to convert:

You can use ISOBuster for a conversion .dmg disk images to another disk image file format like NRG Nero disk image format or ISO disk image format.

You can use PeaZip to a conversion of DMG format to another archive file format. PeaZip also supports extraction of DMG format. Extracted files can be compressed in to another archive file format, that PeaZip supports (7Z, ARC, BZ2, GZ, PAQ/ZPAQ, PEA, QUAD/BALZ, TAR, UPX, ZIP).

Find conversions from dmg file:

dmg to bin

dmg to img

dmg to ipa

dmg to ipsw

dmg to iso

dmg to rar

dmg to zip

Find converter to dmg file type:

app to dmg

bin to dmg

cdr to dmg

exe to dmg

img to dmg

iso to dmg

rar to dmg

File identification strings:

HEX code: 78
ASCII code: x

List of software applications associated to the .dmg file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open dmg file, edit dmg file, convert dmg file, view dmg file, play dmg file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting dmg files.

Software that open dmg file - Apple Mac disk image

Programs supporting the exension dmg on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open dmg file action.

Microsoft Windows:

Main software associated with dmg file by default:
7-zip small icon 7-zip
Other suggested software:
gBurner small icon gBurner
PeaZip small icon PeaZip
PowerISO small icon PowerISO

Apple macOS / Mac OS X:

Main software associated with dmg file by default:
Apple Disk Utility small icon Apple Disk Utility
Apple Finder small icon Apple Finder
Other suggested software:
DropDMG small icon DropDMG
DAEMON Tools for Mac small icon DAEMON Tools for Mac

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