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Apple Mac disk image
File type: Disk image (ISO) binary file
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.
Found 2 different file type records with the same dmg filename suffix.
File type category:
Disk image (ISO) binary file
Date updated: July 19, 2025
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:
application/x-apple-diskimage
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.
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).
Software applications that can open dmg files:
Microsoft Windows
Apple macOS / Mac OS X
Programs for viewing dmg files:
Microsoft Windows
Software apps that create dmg files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that convert dmg files:
Apple macOS / Mac OS X
Software apps that import dmg files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that extract dmg files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that burn dmg files to disc:
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File type category:
Binary file
Date updated: September 4, 2017
The dmg file extension is also related to Oracle Database, an object-relational database management system produced by Oracle Corporation.
This type of dmg file stores dump data in binary file format created by ORACLE Export utility and Import utility.
These dump files can be viewed using special viewers and import utilities from Oracle.
Dump files are typically not meant for conversion.
Software apps that create dmg files:
Multiplatform
Software applications that handle other tasks involving dmg files:
Multiplatform
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