.MID File

File extension mid is commonly used for MIDI audio files. Musical Instrument Digital Interface (MIDI) is a standard protocol for the interchange of musical information between musical instruments, synthesizers, and computers.

This standard defines the codes for a musical event that include the start of a note, its pitch, length, volume, and musical attributes, such as vibrato. It also defines codes for various button, dial, and pedal adjustments that are used on synthesizers.

MIME types:
audio/mid
audio/midi
audio/x-mid
audio/x-midi
music/crescendo
x-music/x-midi

Files with mid extension can be found as common MIDI files. Also uses MIDI extension. It is one of the most basic sound files, used a lot in the past.

How to open:

MIDI formats are well supported, plenty of audio editors, players and other software supports it.

How to convert:

MIDI files can be processed by musical software and an audio file can be generated from them. They may also be turned into music sheets and tablatures.