What this is
Audio to MIDI Converter is a free web tool that turns an audio recording into a MIDI file. You drop in a file, the page works out the notes, and you download a .mid file you can open in any DAW or notation program. You can also export the note list as a CSV.
Everything runs on your own device. The audio is decoded, analysed and converted inside your browser, and the MIDI file is assembled there too. Nothing is uploaded, because there is nowhere to upload it to.
Who makes it
This site is built and maintained by the small team behind Audio to MIDI Converter. We are an independent project and are not affiliated with, endorsed by, or connected to any digital audio workstation vendor, plug-in maker, or streaming service. Instagram, TikTok, YouTube and similar names, where mentioned, belong to their respective owners.
We build small, single-purpose tools that do one job in the browser rather than sending your files to a server. This is one of them.
How the conversion works
- Your file is decoded by your browser's own audio decoder.
- The audio is read frame by frame to estimate pitch and loudness.
- Frames that hold the same pitch are grouped into notes.
- Those notes are written out as a Standard MIDI file you download directly.
You can change the detection mode, sensitivity, tempo and shortest note length, and the piano roll redraws as you go, so you can see what the settings are doing before you export anything.
What it is not
- It is not a perfect transcription service. Dense mixes will produce extra notes, and quiet or unclear material may be missed. Move the sensitivity slider and check the piano roll before you rely on a result.
- It does not separate instruments the way a stem splitter does. Polyphonic mode looks for several pitches at once, which works on clear, separated parts and struggles on busy material.
- It does not store your files, your results, or anything about you.
Getting in touch
If something is broken, or a file will not open, the contact page has the address to write to.