Upload M4R file from your device memory or cloud or via URL
Once uploading is complete, press the convert button
Wait until the end of the conversion and download new AIFF file
M4A is an audio file compressed using MPEG-4 technology, which has a lossy compression algorithm. The M4R file contains the ringtone in the M4A MPEG-4 file format, which uses the default audio format to store the song in the iPhone. The M4R format, like M4A, is designed to download audio to Apple devices through iTunes. Such a file can be created by converting other formats or uploading it from the official iTunes store. You don't have to look for converters or special programs, you can make m4r from m4a using standard tools of any operating system by changing the last letter of the extension manually. But for this to work like an iPhone ringtone, remember that it can only be created from songs purchased from the iTunes music store.
The AIFF extension is an audio format file developed by Apple Computer in 1988 based on Electronic Arts' IFF format, and is most commonly used in Apple Macintosh computers. Contains CD-quality audio that is stored in an uncompressed lossless format. The content of the file is uncompressed PCM data, a digitized analog audio signal. Like any uncompressed file, AIFF files take up much more disk space than their compressed counterparts: one minute of stereo audio at 44.1 kHz sampling rate and 16 bits takes about 10 MB. The standard file extension is .AIFF or .AIF, for the compressed version the .AIFC extension must be used. AIFFs are widely supported and can store LPCM, they are suitable file formats for storing and archiving the original recording.