Audio Tools for Musicians and Producers
Everything you need to analyze, convert, and create music — all running free in your browser.
MP3 to MIDI Converter
Transform any audio file into editable MIDI notes using AI-powered transcription. Supports vocals, piano, guitar, and more.
BPM & Key Detection
Instantly detect the tempo and musical key of any audio file. Essential for DJs, producers, and music students.
Chord Detection
Automatically identify chord progressions from audio files. Supports 9 chord types across all 12 keys.
Stem Splitter
Create Music, Vocal, Bass, and Drums stems with a model-backed separation service.
MIDI to Audio
Render MIDI files to real MP3, WAV, FLAC, OGG, M4A, WEBM, AIFF, WMA, or ALAC audio.
MIDI to Sheet Music
Convert MIDI files to printable sheet music and MusicXML. Compatible with MuseScore, Sibelius, and Finale.
Why Use mp3tomidi?
100% Private
All processing runs in your browser. Audio never leaves your device.
Instant Results
Get analysis and conversion results in seconds, not minutes.
Works Everywhere
Use on any modern browser — Chrome, Firefox, Safari, Edge.
Your Complete Audio Toolkit
mp3tomidi brings together a comprehensive suite of audio tools designed for musicians, producers, DJs, educators, and anyone who works with audio. Whether you need to convert an MP3 file into editable MIDI notes, detect the tempo and key of a track, identify chord progressions, separate a song into individual stems, render MIDI to high-quality audio, or generate printable sheet music, everything is available right here in your browser — completely free.
Our free online toolkit covers every step of the music production workflow. The MP3 to MIDI converter and audio to MIDI tool uses AI transcription to turn any recording into editable MIDI notes. The BPM finder and BPM detection tool analyzes tempo with onset-density algorithms, while the chord finder identifies chord progressions from audio in real time. The stem splitter and audio separator creates Music, Vocal, Bass, and Drums stems for remixing and karaoke workflows. With the MIDI to MP3 converter and MIDI to audio renderer, you can turn MIDI files into high-quality WAV sound. Finally, the MIDI to sheet music and sheet music converter generates printable MusicXML scores from any MIDI file.
Each tool is purpose-built for its task and powered by modern web technologies. The MP3 to MIDI converter uses advanced AI transcription models running via TensorFlow.js directly in your browser, producing accurate note-by-note MIDI output from any audio source. The BPM and key detection tools leverage the Web Audio API with fast Fourier transform (FFT) algorithms to deliver instant, reliable results. The chord detector analyses chromagram data to identify chord types across all 12 keys, while the stem splitter uses a separate model backend to create Music, Vocal, Bass, and Drums stems from a mixed track.
DJs use these tools to prepare sets, match tempos, and find compatible keys for harmonic mixing. Music producers rely on them to sample, remix, and arrange tracks more efficiently. Music educators and students benefit from the ability to visualize musical structure — seeing chord progressions, key changes, and note patterns laid out clearly. Content creators can extract stems for video production or generate sheet music for transcriptions and arrangements.
Privacy and processing boundaries are stated per tool. Browser analysis tools keep work local where that is technically practical; the Stem Splitter uploads audio to a dedicated Python model service because real stem separation needs backend inference.