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Free Online MIDI to MP3 Converter

Convert MIDI to MP3 audio online for free.

Drop MIDI files here
or click anywhere in this box to choose files

Max file size 50MB. Sign up for more.

MIDI to MP3: synthesis, not conversion

A MIDI file contains no audio whatsoever. It is a score — note on, note off, pitch, velocity, which instrument number — and it has to be performed before there is anything to encode. The conversion runs those instructions through a software synthesiser with a soundfont, records the result, and encodes that to MP3. Two converters with different soundfonts produce audibly different music from an identical MIDI file.

Convert when you need something that will actually play on a phone, a website or a player. Keep the MIDI for editing: it is the only form where you can still change a note, a tempo or an instrument.

MIDI to MP3 FAQ

Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert MIDI files to MP3.

How do I convert MIDI to MP3?
Upload your MIDI audio to iFormat and click Convert. The track is decoded and re-encoded to MP3 with metadata preserved. It's free, needs no account, and supports batch conversion of albums or playlists.

How to convert MIDI to MP3 without losing sound quality
MP3 is the near-universal lossy audio format. Converting to a lossless target (WAV, FLAC, AIFF) preserves every detail of the original. Converting between lossy formats involves a small, usually inaudible re-encoding step. For the best result, always start from the highest-quality source file you have.

Can I convert multiple MIDI files to MP3 at once?
Yes — upload an entire album or playlist of MIDI files and iFormat batch-converts them all to MP3. Metadata (title, artist, album, cover art) carries over for each track, so your library stays organised after conversion.

Does MIDI to MP3 conversion keep track info like artist and album?
Yes — ID3 metadata such as title, artist, album, and cover art carries over automatically wherever the MP3 format supports it, so your library stays organised after conversion.

How do I open MIDI files?
On Windows: Media Player plays it with the built-in synth; MuseScore to see the notation. On a Mac: GarageBand, MuseScore, or QuickTime. A MIDI file holds no audio at all — only note instructions. How it sounds depends entirely on the synthesiser playing it, which is why the same file sounds different on every device.

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