MP3 to MIDI Converter is a free, browser-based tool that uses a lightweight machine-learning model to transcribe MP3 audio into editable MIDI note data. No signup, no upload to servers—your audio stays on your device.
What is MP3 to MIDI Converter?
MP3 to MIDI Converter is a web application that converts MP3 audio files into standard MIDI files by detecting note onsets, pitches, durations, and velocities. It runs entirely in your browser using a locally loaded ML model, so your audio never leaves your device. The tool is provided as a free online service with no account required.
Key Features
- Browser-based processing — The MP3 is decoded and analyzed on your device; only the ML model and page assets are downloaded.
- Audio-to-MIDI transcription — Detects multiple simultaneous pitches (polyphonic) from voice, piano, guitar, bass, and other solo instruments.
- Built-in piano roll editor — Move, resize, join, or delete detected notes with undo/redo and optional grid snapping.
- Preview before download — Compare original audio with synthesized MIDI playback side by side.
- Standard MIDI output — Download a .mid file compatible with any DAW or MIDI editor.
- Input limits — Accepts MP3 files up to 20 MB and 3 minutes in length; works best on clean, solo recordings.
- Mobile-friendly — Works on modern mobile browsers, though performance depends on device hardware.
Who is it for?
- Musicians and producers — Quickly turn recorded melodies, vocal lines, or instrumental riffs into editable MIDI for further arrangement in a DAW.
- Music educators and students — Transcribe a recorded performance to analyze notes, timing, and intervals for practice or study.
- Hobbyists and content creators — Extract note data from audio clips to remix, transpose, or create instrumental covers without manual transcription.
What can you do with MP3 to MIDI Converter?
- Transcribe a recorded piano melody — Upload a solo piano MP3 and get a MIDI file with note pitch, timing, and duration ready to edit in your DAW.
- Convert a vocal hum or singing — Use the voice preset to capture the melody line as MIDI notes for songwriting or arrangement.
- Edit detected notes before export — In the piano roll, fix incorrect notes, adjust timing, and remove unwanted detections—all without opening another application.
How does it work?
- Upload an MP3 file (or use the sample). 2. Choose the audio type that best matches your recording (voice, piano, guitar, bass, full song, or Not Sure). 3. The ML model processes the audio locally and displays a piano roll with detected notes. 4. Preview, edit, and download the MIDI file.
