If you need to create a DMG installer from a Mac OS X package (.app) you can for example use the App2Dmg utility that can perform this task simply by dragging the .app file to the program's main windows. It is not actual conversion, more of creating one file from another.
Home > Search converters: app to dmg
Conversion of app file format to dmg file format beta
Search for app to dmg converter or software able to handle these file types.
Convert Mac application package or core system service to Apple Mac disk image.
We have found one software suitable in our database for this conversion.
Apple macOS / Mac OS X software 
- convert app to dmg on macOS
App2Dmg
A simple APP to DMG creator
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from app file | No | No | No | No | No | Yes | No | No |
to dmg file | No | No | No | No | No | No | Yes | No |
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.
Additional links: Open app file, Open dmg file
APP
Files with app extension are commonly related to app packages for Mac OS X (macOS) operating system for Apple Mac Pro, MacBook Pro, Mac Mini and MacBook Air computers.
DMG
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.
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