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MIDI to MP3 Converter - Every Track on Its Own Instrument

Upload a .mid or .midi file, pick MP3 or WAV and click Convert. Each track is rendered with the General MIDI instrument it names, with real drums on channel 10, using 128 instruments and drum kits. Preview it with mute, solo and tempo first. Everything runs on your device.

How to Convert MIDI to MP3

From a .mid file to an audio file in four steps

01
Upload a MIDI file
Drop a .mid or .midi file up to 5 MB. The tool reads its duration, tempo, time signature and tracks, and starts loading the instrument sound bank.
The sound bank is about 14.6 MB and downloads once; your browser caches it for next time.
02
Pick MP3 or WAV
Choose MP3 (192 kbps) for a small file that plays anywhere, or WAV (16-bit, 44.1 kHz stereo) for lossless audio to edit in a DAW.
Pick WAV if you plan to mix, master or re-encode the audio later.
03
Click Convert
The whole song is rendered on your device, faster than real time, then encoded to the format you chose. A progress bar shows each phase.
Conversion always uses the full song at normal tempo with every track, plus about 2 seconds of release tail.
04
Download, or preview first
Save the finished file. You can also play the MIDI in the browser, mute or solo tracks and change the tempo to check it before or after converting.
Mute and solo only affect the preview; they don't change the converted file.

MIDI to MP3 Converter Features

Real instrument sounds, two output formats and no upload

01
128 instruments and drum kits
Rendered with spessasynth and the FluidR3Mono General MIDI SoundFont, so each track plays with the instrument the file names and channel 10 plays real drums.
02
MP3 or WAV output
MP3 at 192 kbps for sharing, or 16-bit, 44.1 kHz stereo WAV for editing and further processing.
03
Faster than real time
The song is rendered offline on your device, so a four-minute file doesn't take four minutes to convert.
04
Nothing is uploaded
Your MIDI file is read, rendered and encoded in this browser tab. It never leaves your computer.
05
Preview with mute, solo and tempo
Play the file first, mute or solo tracks, slow it down to 0.5x or speed it up to 1.5x, loop and seek with a piano-roll view.
06
Complete, clean renders
Every track at the original tempo, with about 2 seconds of release tail so the last notes ring out instead of cutting off.

MIDI to MP3 FAQ

Questions about converting MIDI files to audio

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A MIDI file contains no audio. It stores notes, timing and which instrument each track should use. A synthesizer has to turn those instructions into sound; this tool does that and saves the result as an MP3 or WAV file that plays anywhere.

Upload a .mid or .midi file, choose MP3 or WAV in the export card, click Convert and download the file when it's ready. The whole process runs in your browser.

The FluidR3Mono General MIDI SoundFont (MIT licence), played by spessasynth in your browser: 128 General MIDI instruments plus drum kits. Each track uses the instrument named in the file, and channel 10 plays real drums.

MP3 (192 kbps) is small and plays on any phone, player or website. WAV (16-bit, 44.1 kHz stereo) is lossless and larger; choose it if you want to edit, mix or re-encode the audio later.

The instrument sound bank is about 14.6 MB. It loads once when you pick a file and is cached by your browser, so later conversions start much faster.

No. They only affect the in-browser preview. The converter always renders the full song at its normal tempo with every track, and adds about 2 seconds of release tail at the end.

Nothing is uploaded: reading, rendering and encoding all happen on your device. Files can be .mid or .midi up to 5 MB, which covers almost any song.

It will use the right instruments, but General MIDI is a good, consistent sound bank rather than a commercial sample library, so it won't sound like a studio production. Files that rely on non-GM banks or SysEx-specific sounds fall back to General MIDI sounds.

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