audiojs Audio to MIDI review
A free, local browser tool for turning single-line melodies into editable notation.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
audiojs Audio to MIDI is a free, open-source web tool for transcribing a single melody from an uploaded or pasted recording. It is aimed at singers, instrumentalists, and music learners working with one instrument or voice at a time, including singing, whistling, solo piano, guitar, or bass. The browser-based workflow produces Standard MIDI, MusicXML, and ABC notation, giving users several ways to continue editing or reviewing a transcription. Audio remains on the device and is not uploaded.
Its strongest fit is a focused melody-to-MIDI workflow rather than broad audio arrangement analysis. Automatic tempo and key detection provide useful starting points, while quantization controls can help organize the generated result. Synthesized playback gives users a way to check the transcription against the source melody. Because processing occurs locally in the browser, the product suits users who want a lightweight web workflow without sending recordings away from their device. The web-only format also keeps the scope straightforward for occasional transcription tasks.
The main trade-off is musical scope. audiojs Audio to MIDI is not intended for reliable transcription of chords, drums, dense mixes, or multiple independent melodic lines, and its category specifications do not include chord detection, stem separation, or tablature output. Choose it for free, single-line melody conversion with MIDI and notation exports. Users working with layered recordings, chord-heavy material, drum parts, or several simultaneous melodies should choose a tool designed for those arrangements instead.
audiojs Audio to MIDI pros and cons
- Where it wins
- Free and open-source with local, in-browser processing
- Exports MIDI, MusicXML, and ABC notation
- Detects tempo and key with quantization and playback controls
- Where it doesn't
- Designed for one instrument or voice at a time
- Not intended for reliable chord or drum transcription
- Does not reliably handle dense mixes or multiple melodic lines
audiojs Audio to MIDI fact sheet, pricing and score →
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