Converting .ios files to .dmg format.
An .ios to .dmg conversion (Apple IOS Data Format to Apple Disk Image) is, unfortunately, not possible. If you are searching for ways to convert iPhone/iPad apps to be used on your Mac device, make sure that the app's developer provides the same utility for MacOS.
In a word, direct ios to dmg conversion is not possible.
So don't expect any so-called ios to dmg converter or ios to dmg free online conversion tool available.
The database currently does not contain any ios software converter.