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Turn audio into editable MIDI in your browser

SoundToMIDI converts MP3, WAV, FLAC, M4A, OGG, AAC, and compatible MP4 files into editable MIDI directly in your browser. Audio transcription runs locally with no account required. Raw MIDI downloads are free, while an optional cleaned MIDI export costs $2.99 once. It works best with clear melodies or isolated instruments; dense mixes may need manual editing.
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SoundToMIDI is a browser-based audio transcription tool that converts MP3, WAV, FLAC, M4A, OGG, AAC, and compatible MP4 files into editable MIDI data. The entire process runs locally on your deviceāno files are uploaded, no account is required, and there are no daily conversion caps. It uses Spotify's open-source Basic Pitch neural network to detect notes, chords, and pitch bends, then lets you download a standard .mid file you can open in any DAW or notation app.
Your audio never leaves your computer. SoundToMIDI decodes and transcribes files locally, so even unreleased demos or copyrighted material stays completely private. The ~1 MB AI model caches in your browser, making repeat conversions nearly instant.
You can download the raw transcription as a standard .mid file at no cost, with no watermark, no sign-up, and no limits on how many files you convert. Pitch bends are included in this free version, giving you the full detected performance data.
For $2.99 one-time, SoundToMIDI applies local music rules to refine the Basic Pitch transcriptionāremoving stray notes, quantizing to a tempo grid, and cleaning up the performance. You can preview the cleaned result in-browser before paying, and the payment unlocks a single download tied to your current browser session.
Choose Voice, Piano & Guitar, Bass, or General to set detection and cleanup parameters that match your source material. Advanced settings remain editable, so you can fine-tune onset confidence, note confidence, minimum note length, and tempo to suit each recording.
Your audio never leaves your deviceāSoundToMIDI is a converter that respects both your privacy and your workflow.
Most free converters force you to upload files to their servers, cap your conversions, or watermark the output. SoundToMIDI sidesteps all of that by running entirely in-browser, making it genuinely private and unlimited. The free raw MIDI download is a real working file, not a teaser, and the optional cleaning step is priced as a one-time purchase rather than a subscription. It also handles polyphonic audioāchords, piano, guitar, and vocalsāthanks to the underlying Basic Pitch model, which is a rare capability in free browser tools.
You want to transcribe a clear melody, isolated instrument, or vocal line into editable MIDI without uploading sensitive audio to a third-party server. It's especially useful if you're on a tight budget, since the free tier is genuinely functional, or if you need a quick, offline-friendly solution for capturing musical ideas on the go. Dense mixes with many overlapping instruments will likely need manual editing afterward, so it's best suited for clean source material or single-instrument recordings.
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