MIDI → FLAC Converter

Convert MIDI to FLAC - Archive the Render, Keep the Score

A lossless copy of one FluidSynth performance. The .mid stays the master.

FLAC Converter

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Drop files to convert

Drag files here or pick them from your device

Expert Tips

What the pros know

Pro Tip

Tag the FLAC with how it was made: rendered from name.mid, FluidSynth, FluidR3. Years from now that note explains why the recording sounds the way it does, and the .mid beside it lets you render a fresh one.

Common Mistake

Deleting the .mid because the FLAC is lossless. The FLAC preserves one performance; the score it came from is the only file that can produce a new one.

Best For

Archivists and collectors making a listenable, lossless snapshot of a MIDI collection while keeping the original files as the source of truth.

Not Recommended

Converting to FLAC hoping for higher fidelity than MP3 from the same MIDI. Both start from the identical render; FLAC just stores it without loss. If the render itself is the limit, the format won't change that.

FAQ

Frequently Asked Questions

Both start from the identical FluidSynth render. FLAC stores it without loss, MP3 discards a little to save space. For listening, the difference is hard to hear; for archiving or further editing, FLAC keeps every sample.

Because there's no original recording to be faithful to. A MIDI is a score, and every conversion records some synthesizer performing it. The FLAC is a perfect copy of our performance, not of a recording that never existed.

Yes. It's the master. The FLAC captures one rendering; the .mid can produce a new rendering with better tools later, and it takes up almost no space.

Noticeably larger than an MP3 of the same music and smaller than a WAV, since FLAC compresses without discarding. The exact size depends on how dense the music is.

What Lossless Means When the Source Is a Score

FLAC compresses audio without discarding anything: unpack it and the recording comes back sample for sample. That guarantee applies to a recording, though, and a MIDI file doesn't contain one. It contains the score. What a MIDI to FLAC conversion preserves perfectly is our performance of that score: FluidSynth playing your file through the FluidR3 General MIDI soundfont, loudness normalized by default, stored without loss.

There's no hidden original recording a better converter could dig out. Every MIDI-to-audio tool records its own synthesizer; FLAC keeps ours intact, nothing more.

Keep the .mid File. It's the Master.

The FLAC freezes one rendering. The MIDI can still become any rendering: a future soundfont, a different synthesizer, a re-arranged version. It also costs nothing to keep, since a full song's score fits in a few kilobytes. Archive both, the FLAC as the listenable snapshot and the .mid as the source you might render again years from now.

How to Convert MIDI Into FLAC

Upload the .mid or .midi file.
Pick FLAC from the output list.
Download the FLAC when the server finishes rendering.

Rendering happens server-side: the file uploads, converts there, and the FLAC comes back to your browser.

When FLAC Earns Its Size

Choose FLAC when the render is headed for an archive, a lossless music library, or an editing project that will process it further. For a phone or a share link, the extra size buys nothing you can hear; MIDI to MP3 makes a smaller file from the same render.

Reviewed by ChangeMyFile Team · Last reviewed: April 2026

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