Convert MP3 to MIDI Online Free

Converting MP3 to MIDI opens up a world of possibilities for musicians, producers, and educators. A MIDI file represents music as a sequence of note events — pitch, timing, velocity — rather than audio waveforms. This makes it possible to edit individual notes, change instruments, adjust tempo, transpose keys, and integrate the performance into any digital audio workstation (DAW) or music notation software. What was once a fixed audio recording becomes a fully editable musical score.

Traditionally, audio-to-MIDI conversion required expensive commercial software with mediocre results. Our free online tool changes that by leveraging Spotify's Basic Pitch — a state-of-the-art neural network trained on a vast dataset of musical audio. The model can detect overlapping notes, handle polyphonic material, and produce remarkably accurate MIDI output from guitar, piano, vocals, and other instruments. Because the conversion runs entirely in your browser using WebAssembly and TensorFlow.js, your files never leave your device.

The practical applications are endless. Transcribe a piano recording to learn the notes. Extract the melody from a song to create an arrangement. Convert a guitar riff to MIDI for use with a synthesizer. Generate notation from an audio file for sheet music. DJs and remix artists can isolate note sequences to build new productions around existing recordings. Music teachers can create exercises and study materials from real performances.

Our converter supports all popular audio formats including MP3, WAV, FLAC, OGG, M4A, AAC, and WebM. Simply upload your file, let the AI model process it, preview the results on the interactive piano roll, play back the MIDI with built-in controls, and download the .mid file. The entire process takes seconds, requires no account or software installation, and is completely free for files up to 30 seconds in length.

How Does Audio to MIDI Conversion Work?

Under the hood, our MP3 to MIDI converter uses Spotify's Basic Pitch neural network. The model first converts your audio into a spectrogram — a visual representation of frequency over time. It then predicts which notes are active at each moment, producing a piano-roll-like output. Post-processing steps include onset detection (to find where notes start), confidence filtering (to remove false positives), and quantization (to align notes to a rhythmic grid). The result is a Standard MIDI File (Type 0) at 480 ticks per quarter note, compatible with every major DAW.

Tips for Best Results

Audio quality matters. Clean solo recordings — a single guitar, piano, or vocal — produce the most accurate MIDI output. If your audio has background noise or multiple instruments playing simultaneously, the model will detect all prominent pitches, which may result in more notes than expected. For best results with full mixes, try using our Stem Splitter first to isolate vocals or individual instruments, then convert each stem separately. You can also adjust the confidence threshold in the MIDI adjustments panel to filter out low-confidence detections.

What Can You Do with the MIDI Output?

Once you download the .mid file, the possibilities expand dramatically. Import it into Ableton Live, FL Studio, Logic Pro, GarageBand, Cubase, or Pro Tools to edit notes, change instruments, and rearrange the performance. Open it in MuseScore or Sibelius to generate sheet music. Use it in a game engine for adaptive music. Feed it to a hardware synthesizer for live performance. The MIDI format is universal — over 40 years old and supported by virtually every music device and application ever made. Whether you are a bedroom producer or a professional arranger, an audio-to-MIDI converter is an essential tool in your workflow.