M4R file format
| Extension | .m4r |
| Category | audio |
| Programs | Apple QuickTime Player |
| Main program | Apple iTunes |
| Description | This format is used in smartphones of the iPhone series. Mainly, this format is an AAC and M4A file. Not all audio files from the iTunes store can be converted to M4R. When syncing with an iPhone and a computer, these files are automatically transferred to the phone. These files can be purchased or downloaded from iTunes. Additionally, audio files in other formats can be converted to the M4R format. This format ensures the best possible ringtone for iPhone. |
| Technical details | M4R differs from MP3 due to its compression method. This format is part of the MPEG-4 standard, specifically under the ISO-IEC standard 14495-3. Despite employing auditory masking, the lossy compression of M4R is comparable to AAC and MP3 files. It works by reducing audio size by eliminating data and sounds that are imperceptible to the human ear. This allows M4R to create high-quality audio files without taking up a lot of storage space. Users can select any audio of their choice for use, such as a ringtone or alert tone. |
| MIME type | audio/aac |