mp3tomidi Audio Tools is a browser-based audio toolkit for musicians, producers, and creators, offering multiple features ranging from audio analysis to music production.
Main capabilities Audio to MIDI: Uses Spotify's open-source Basic Pitch neural network to detect pitch, onsets, and velocity, converting audio such as MP3, WAV, OGG, FLAC, M4A, AAC, and WebM into editable standard MIDI files that can be edited in any digital audio workstation. BPM and key detection: Instantly detects the tempo and musical key of any audio file. Chord detection: Automatically identifies chord progressions from audio files. Stem separation: With support from a model backend, generates stems for music, vocals, bass, and drums. MIDI render audio: Renders MIDI files into real audio formats such as MP3, WAV, FLAC, OGG, M4A, WEBM, AIFF, WMA, or ALAC. MIDI to sheet music: Converts MIDI files into printable sheet music and MusicXML.
How to use Users upload audio files such as MP3, WAV, OGG, or FLAC, the algorithm processes them in the browser, and then results such as BPM, key, chord progression, and detected notes can be viewed instantly. The basic analysis tools are free to use without registration.
Privacy and processing boundaries The official explanation states that core analysis and conversion are completed locally in the browser, audio files are not uploaded to a server, uploaded content is not tracked, audio is not stored, and it is not used for model training. However, stem separation is an exception: it uploads audio to a configured model backend to generate genuinely separated stems, rather than tracks that have only undergone EQ filtering. Each tool clearly indicates its processing boundaries.
Use cases It can be used for DJs detecting BPM when preparing performances, producers converting recordings to MIDI for layering synthesizers, music educators transcribing chords, game developers converting reference tracks into editable MIDI, mixers separating vocals, piano students converting performances into sheet music, and more.
Limitations and information not yet provided Officially, the core features are permanently free, but no specific information is provided about paid pricing, subscription plans, or premium features. Stem separation depends on a model backend and requires uploading audio. Other information such as specific accuracy metrics, processing time limits, and file size limits has not yet been provided.
