No upload. No account. No audio leaves your device.
Note Lab is a free tool that turns a recorded melody into editable MIDI notes. Drop an audio file, click convert, and download a .mid file you can open in any DAW. Everything happens locally — the audio is decoded, analyzed and exported without sending anything to a server.
The browser decodes your audio using the Web Audio API. A pitch detector follows the strongest stable frequency over time, groups it into notes, and estimates MIDI velocity from loudness. The result is a standard General MIDI file at 120 BPM that preserves note pitch, timing and dynamics.
The page has a strict Content Security Policy that blocks all outbound connections. There is no upload endpoint, no analytics, no third-party scripts. The audio you load is processed and discarded within the browser tab. Close the page and it is gone.
The converter follows one dominant pitch at a time. It works best on clean, solo melodies — a single vocal line, a hummed tune, or an isolated instrument. Chords, multi-instrument mixes, and percussion-heavy tracks will produce incomplete or inaccurate results.
Yes. The tool is free to use with no account, no sign-up, and no usage limits beyond the 50 MB / 5 minute file size cap.
MP3, WAV, FLAC, OGG and M4A are fully supported. The tool can also read the audio track from MP4, MOV, AVI, MKV and WebM files when your browser has the codec.
Yes. The page is responsive and works in mobile browsers that support the Web Audio API, including Chrome and Safari on iOS and Android.
The .mid file you generate is yours. The notes are derived from your audio — what you do with them is up to you and depends on the copyright of the source material.
Drop a file and turn it into MIDI. It runs entirely in your browser.
Go to the converter