PitchChanger.io

What it does

PitchChanger.io is a free, browser-based audio pitch shifting tool for musicians, DJs, teachers, and content creators. Users upload audio files (MP3, WAV, FLAC, M4A, AAC) and adjust pitch ±12 semitones in real-time without changing speed. All processing happens client-side for privacy and speed.

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  Built this over the weekend to bridge the gap between "can hum a melody" and "can code algorithmic music patterns" (Strudel/TidalCycles) for live coding and live dj'ing. What it does: Real-time pitch detection in browser using multiple algorithms: CREPE (deep learning model via TensorFlow.js) YIN (autocorrelation-based fundamental frequency estimation) FFT with harmonic product spectrum AMDF (average magnitude difference function) Outputs: visual piano roll, MIDI files, Strudel/TidalCycles code All client-side, nothing leaves your machine Why multiple algorithms: Different pitch…

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