The free program Converterlite Free MP3 to MIDI converts audio files into the MIDI format. The program batch converts MP3s or other audio files into the MIDI format automatically. Converterlite Free MP3 to MIDI runs in over seven languages.
For a simpler solution, the websites Ofoct.com and ConversionsCat.com convert any uploaded audio file into a MIDI online for free. These are both good solutions for single audio file conversions, but desktop software is a better option for batch conversion.
The Musical Instrument Digital Interface, or MIDI, is a format that allows communication between computers and musical instruments. A MIDI file does not contain audio but instead contains numerical data that can correspond to particular notes as well as specific volumes or tempo parameters. Because a MIDI file contains no actual audio, the data is interpreted in many different ways by the program used to decipher it. MIDI files are almost exclusively used in digital music production.
The MIDI technology standard began in 1983, and it is currently maintained by the MIDI Manufacturers Association. A large appeal of MIDI files is their extremely small file size; the data for an entire song can be coded into no more than a few kilobytes. Because of the accessibility and widespread use of MIDI files, the MIDI standard helped to establish home recording. As of 2015, all official MIDI standards are developed and published by the MIDI Manufacturers Association in Los Angeles.