MP3 to MIDI Converter is a free online tool that turns MP3 audio into editable MIDI files using AI-powered note detection.
How it works
Upload an MP3 file, choose the closest audio type (voice, piano, guitar, bass, another solo instrument, a full song, or Not Sure), and the AI transcribes the notes. The entire process runs locally in your browser — your audio stays on your device and is never uploaded to a server.
Key Features
AI-powered note detection — Detects pitch, timing, and duration, including chords and polyphonic audio
100% browser-based — No uploads, no servers, no signup required
Built-in piano roll editor — Move, resize, join, or delete notes with undo, redo, and optional grid snapping
Preview before downloading — Compare the original audio with the synthesized MIDI playback
Standard MIDI output — Download a .MID file and continue editing in any DAW or MIDI editor
Limitations
Supports MP3 files up to 20 MB and 3 minutes
Works best on solo instruments or clear melodies; full songs are experimental and may need cleanup
Who it's for
Musicians and producers who want to transcribe audio into their DAW (Ableton Live, Logic Pro, FL Studio, etc.)
Music learners who want to see the notes of a song
Anyone who needs a quick, private, and free MP3 to MIDI conversion
