There is actually no need to convert iPhone ringtones (.m4r) to standard .mp4 files, you can just rename the extension from m4r to mp4 and that's it. You can also do this with some audio converters, but they will usually just rename the files as well.
Convert Apple iPhone ringtone format to MPEG-4 video file format.
We found one software available in the database for this conversion.
Apple macOS / Mac OS X software - convert m4r to mp4 on OS X
An iPhone ringtone creator
Convert from m4r file format
|Yes, Aiseesoft iPhone Ringtone Maker for Mac supports m4r file conversion as a source file type.||Yes||Yes||m4r editor||Yes||No||Yes||No|
|Yes, Aiseesoft iPhone Ringtone Maker for Mac supports mp4 file conversion as a target file type.||No||No||No||No||No||No||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.