MIDI to MP3 Converter Online
Turn any MIDI file into listenable MP3 audio with SoundFont rendering — preview it right here, then download.
- MIDI / .mid
- SoundFont rendering
- Custom .sf2
Click a note to hear it
What is MIDI to MP3?
MIDI to MP3 is the reverse of transcription: it renders a MIDI file — a list of notes with no sound of its own — into an audible MP3 you can share or play anywhere. A synthesizer reads the notes and a SoundFont supplies the instrument voices, producing a finished waveform.
This is what you reach for when a collaborator, phone, or website cannot open a .mid file. Load your MIDI, pick or upload a SoundFont for the sound you want, and export an MP3 that plays in any media player.
How it works
Upload your MIDI file
Drop a .mid file. Optionally upload your own .sf2 SoundFont to render with exactly the instrument sound you want.
Preview the rendered audio
Listen to the rendered result directly in the browser before downloading — no guessing how it will sound.
Download the MP3
Get a high-quality MP3 render, ready to share, embed in a video, or drop into a playlist.
Formats & limits
- Input formats
- MIDI
- Output
- MP3
- File limits
- 50 MB · 10 min
- Price
- Free · no sign-up
Highlights
SoundFont voices
Render with the built-in instruments or upload your own .sf2 for a specific tone.
Share anywhere
Turn a silent .mid into an MP3 that plays on phones, browsers, and messengers.
Faithful timing
Tempo, velocity, and note lengths from the MIDI are preserved in the render.
Getting a better-sounding render
- Upload a SoundFont (.sf2) that matches your piece — a piano SoundFont for piano MIDI, strings for orchestral sketches.
- Check the MIDI in a piano-roll preview first: wrong tempo or stray notes in the file will be rendered as-is.
- Shorter, single-instrument MIDI files render fastest and most predictably.
Frequently asked questions
How does MIDI to MP3 conversion work?
MIDI contains notes, not sound. We synthesize the notes with a SoundFont instrument sample library (FluidSynth) and encode the result as MP3 — the same way a DAW would render it.
Can I choose the instrument sound?
Yes. Upload any .sf2 SoundFont file and your MIDI will be rendered with it. Without one, a default piano SoundFont is used.
Is this MIDI to MP3 converter free?
Yes. Conversion, browser preview, and download are free with no account required.
Can I preview before downloading?
Yes — the rendered audio plays directly in the page so you can check the sound before saving the MP3.