MIDI Converter

MIDI Converter - Turn .mid, .midi and .kar Files Into Audio

Six audio outputs for MIDI scores, rendered by an engine we name so you know what you'll hear.

MIDI Converter

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Expert Tips

What the pros know

Pro Tip

Convert one file to MP3 first and listen before doing a whole batch. Every page here uses the same FluidSynth and FluidR3 setup, so one test render tells you how the entire collection will sound.

Common Mistake

Running the same MIDI through several converters looking for the accurate one. There's no original recording to be accurate to; each tool records its own synthesizer's performance.

Best For

Anyone holding .mid, .midi or .kar files that modern apps won't play: downloaded game themes, notation-software exports, old collections from the dial-up era.

Not Recommended

Converting to audio while you're still editing the piece. Audio can't be reliably turned back into a score, so keep working in MIDI and render when the notes are final.

Frequently Asked Questions

Decide by where the file ends up. A person listening: MP3. An audio editor: WAV. An Apple library: M4A. A game engine: OGG. A long-term archive: FLAC. An iPhone ringtone: M4R.

Yes, they're MIDI files with a lyric track. The music renders normally; the lyrics are display text and don't become audio. The KAR to MP3 page covers what that means in practice.

A MIDI has no sound of its own, so every converter records its own synthesizer performing it. Ours is FluidSynth with the FluidR3 soundfont, stated on every page, so you know what produced your file.

Nothing. No account either, and you can upload a batch of files in one go.

What a MIDI Conversion Actually Does

Upload .mid, .midi and .kar files here and they come back as audio. What separates this from other audio conversion is what's in the file: a MIDI holds the score, a list of notes with timing and instrument choices, rather than sound. Rendering that score is a performance, and the sizes show it. One 2.7KB MIDI in our tests became a 1.19MB MP3. The instructions are tiny; the sound they describe is not.

The Engine, Named

Every conversion here runs your file through FluidSynth with the FluidR3 General MIDI soundfont, then normalizes the loudness by default. We name the setup because it decides what you hear: a MIDI has no sound of its own, so two converters with two synthesizers produce two different recordings of the same file. Knowing ours makes the result predictable. Files upload to our servers, render there, and return as downloads.

Pick the Output by Destination

MIDI to MP3: the default; plays on everything and stays small enough to share.
MIDI to WAV: uncompressed audio for Audacity or a DAW.
MIDI to M4A: AAC for Apple Music and iPhone libraries.
MIDI to OGG: the open format game engines and Linux favor.
MIDI to FLAC: a lossless archive copy of the render.
MIDI to M4R: an iPhone ringtone, 40-second limit included.
KAR to MP3: karaoke MIDI; the music converts, the lyric text doesn't.

Working with recorded audio instead? The audio converter hub covers those formats.

Reviewed by ChangeMyFile Team · Last reviewed: April 2026

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