Tonera is a browser-first audio conversion tool designed to transcribe audio files into editable MIDI and musical notation. The tool converts formats such as MP3, WAV, FLAC, M4A, OGG, AAC, and WebM. Using the open-source Spotify Basic Pitch model, it processes files locally on the user's device without requiring an account or uploading the audio files for standard conversions.
The tool provides users with manual controls to clean up the transcribed notes, including sliders for onset, frame threshold, minimum note length, and frequency. Users can export their converted files into multiple formats, including MIDI, MusicXML, PDF, ABC notation, and chord charts. This serves use cases like generating digital sheet music, transcribing instrumental recordings, and creating MIDI tracks for digital audio workstations.
For complex or multi-instrument recordings, Tonera offers an optional, server-side high-precision mode that uses HTDemucs to perform stem separation before transcribing. Standard local conversion is free, while the optional high-precision stem separation relies on a credit-based system.
