MIDI to MP3
Drop a .mid or .midi file here, or choose one
Standard MIDI files up to 5 MB and up to 3 minutes of playing time. A longer file is refused, not trimmed.
What MIDI to MP3 renders from a .mid file
A MIDI file stores note events, not sound, so nothing can play it until an instrument renders it. MIDI to MP3 reads those events and synthesizes them with the pinned GeneralUser SoundFont inside the browser tab.
Sounds the notes the file carries
A .mid file records pitches, velocities and timing rather than audio. This page turns those events into a waveform you can listen to.
Plays them with the built-in GeneralUser SoundFont
The same pinned SoundFont the browser MIDI editor ships plays every track, so a piano part comes out as a piano and a bass part as a bass.
Keeps the MIDI file on your device
The note data goes to a rendering frame on this page's own origin and the SoundFont is fetched from the same site, so the file is never uploaded and no credits are drawn.
How it works
Three moves from a MIDI file to audio
Choose a .mid or .midi file
Pick a Standard MIDI File. Its size is checked before a single note is read.
Let the browser synthesize it
The pinned SoundFont renders the file's note events to audio. A file longer than three minutes is refused rather than trimmed.
Preview and download the WAV
Play the rendered audio in the page, then save it to your device as a .wav file.
The limits behind a MIDI-to-audio render
The largest .mid file the page reads. The size check runs before any note is rendered.
The longest playing time the renderer accepts. A longer file is refused, not cut short.
How many instrument sets play the file: the pinned GeneralUser set the browser MIDI editor also uses.
The file names accepted: .mid and .midi, the two spellings of a Standard MIDI File.
The audio the page returns, which any player or editor can open.
The render runs in the browser and submits no generation job.
Who listens to a MIDI file before committing to an arrangement
Composers auditioning a file
Hear how an arrangement sits with a general instrument set before booking players or opening a full DAW session.
Producers checking an export
Render a .mid exported from a DAW or notation app to confirm the notes, tempo and track layout arrived intact.
Students hearing their notation
Play back a written exercise without installing a sampler, then keep the audio for a class submission.
MIDI to MP3 FAQ
Change the notes, then render again
Open the file in the browser MIDI editor to move notes, change the tempo or swap the instrument, then render the corrected version here.