MP3 is a lossy audio file format, which was first released by the Moving Picture Experts Group in 1993 with the extension .bit until it was changed to .mp3 in 1995. It allows for the storage of large quantities of audio data in a limited amount of space.
iTunes Ringtone File
M4R is a compressed audio format used by iTunes as a ringtone file due to it only supporting mono sound.
How to use this MP3 to M4R converter
Drop your MP3 file into the box, or click to select a file from your computer.
Review file and click remove if you would like to choose another.
Click convert. Your file will upload and the conversion process will begin. Larger files will take longer to convert.
Your new M4R file will appear below. Click download to save to your computer.