M4A to MIDI Converter — Free, No Signup

An M4A to MIDI converter listens to an M4A (AAC) audio file and transcribes the notes it hears — pitch, timing, and length — into a MIDI file. MIDI is not audio; it is note data, so the output can be edited, transposed, and played through any virtual instrument in a DAW.

M4A is a container format that typically holds AAC (Advanced Audio Coding) audio. It was developed by Apple and is the default format for iTunes and iOS devices. Our converter accepts .m4a, .mp4, and .m4b files and turns them into editable MIDI.

No. Our M4A to MIDI converter runs entirely in your browser. Your audio is decoded and transcribed on your own device, so it never leaves your computer — no uploads, no servers, no privacy risk.

Yes. The converter is free with no signup. Free plans can convert audio up to 5 minutes; upgraded plans allow up to 15 minutes. There are no watermarks and no hidden fees.

It depends on the source. A single melody or solo instrument, like a piano or voice, transcribes very accurately. A full mix with drums and many layered instruments is much harder to separate into clean MIDI notes, so results can be messy. For best results, use a clip with a clear dominant melody.

Absolutely. The exported .mid file opens in any DAW or notation software — Logic, Ableton, FL Studio, GarageBand, MuseScore, and more. You can assign instruments, change tempo and key, and edit individual notes.

Free accounts can convert audio up to 5 minutes per file, and upgraded accounts up to 15 minutes. If your M4A clip is longer, cut it down to the part you want to transcribe first.

It uses the Spotify Basic Pitch model, a state-of-the-art polyphonic transcription model that runs locally in your browser via WebAssembly. Because M4A uses AAC encoding (which preserves quality better than MP3 at similar file sizes), the source audio carries minimal compression artifacts, giving the model a strong signal to work from.