Convert BUNDLE to DMG

What the BUNDLE format is

In macOS audio software, .bundle usually identifies a package directory containing executable code, presets, samples, configuration files, or other resources. Audio Unit plug-ins use package bundles such as .component, while audio applications can store supporting instruments and effects in similar bundle structures.

BUNDLE is not a standardized audio codec and does not describe a sample rate, bit depth, channel layout, or compression method. Its contents depend on the application that created it; opening or editing the package with another program may make the associated plug-in or project unusable.

What the DMG format is

DMG is a macOS disk-image format. It stores files and folders in one mountable image and can use compression, encryption, a read-only layout, or a writable layout.

A DMG is useful for distributing an audio plug-in, sample library, project package, or installer while preserving the original bundle hierarchy. macOS mounts it in Finder, but a DMG is a container rather than an audio format and cannot be opened by an audio player as a sound file.

How to convert BUNDLE to DMG

Using Disk Utility

1. Make a backup of the original BUNDLE. Do not rename its extension or edit files inside it unless the audio application's documentation requires that.
2. Create a normal folder, for example AudioPackage, and copy the BUNDLE into it. Keeping the bundle as one package preserves its directory structure.
3. Open Disk Utility and choose File → New Image → Image from Folder.
4. Select the folder containing the BUNDLE, enter an output filename ending in .dmg, and choose compressed for a read-only distributable image. Choose read/write only when the recipient must modify the mounted contents.
5. Click Save. Mount the resulting image and verify that the bundle opens or installs correctly before deleting the source copy.

Using the Terminal

Apple's built-in hdiutil is more predictable for scripted conversions and generally preserves macOS package metadata better than web upload tools. Put the BUNDLE inside a staging folder, then run:

hdiutil create -volname AudioBundle -srcfolder /path/to/staging -ov -format UDZO /path/to/output.dmg

UDZO creates a compressed, read-only DMG. Use -format UDRW instead when a writable image is required. Replace both paths with actual absolute paths; quote paths containing spaces in the shell.

Quality, compatibility, and limitations

No audio quality is lost because this process copies package files rather than decoding and re-encoding audio. Compression can reduce the DMG size, but it does not reduce the size of an individual WAV, AIFF, CAF, or sample file in a way that changes its audio format.

DMG creation does not make an incompatible plug-in or project work on another macOS version, CPU architecture, host application, or operating-system security policy. Test the mounted image on the target Mac, and preserve code signatures, permissions, symlinks, and extended attributes when distributing executable audio plug-ins.

Online converters are unsuitable for this task: they generally treat BUNDLE as an unknown file, cannot reliably preserve macOS package metadata, and require uploading potentially proprietary audio assets. Use Disk Utility or hdiutil instead.