dmg2img

dmg2img is a compact, open-source command-line tool that converts Apple Disk Image (.dmg) files into raw disk images (.img). It is primarily used on non-macOS systems—especially Linux and Windows—to access or prepare DMG contents without macOS.

The program reads the DMG container, extracts the disk image data, and writes a corresponding IMG file. It supports common DMG formats, including read-only compressed images, enabling users to mount or burn the resulting IMG with standard tools. It does not emulate a Mac filesystem; the output is a raw image that can be attached to virtualization software or written to physical media.

Typical usage is: dmg2img input.dmg [output.img]. If the output file is omitted, dmg2img derives the name from the input file and uses the .img extension. Some distributions provide Windows and macOS builds; the tool is often packaged in Linux repositories or available from its project page.

While dmg2img covers many DMG variants, it cannot reproduce every possible DMG. Very new or highly specialized DMGs (such as certain sparsebundle configurations) may fail to convert.

dmg2img is free/open-source software; the source code is available from its repository, and it is released under a GPL-compatible license.