Change Audio Pitch
Shift pitch in semitones. Speed and duration stay the same.
How to change audio pitch
- Add an audio file.
- Set the pitch shift in semitones. Positive numbers go up, negative go down.
- Export. The duration of the file is unchanged.
About this tool
Pitch and tempo are physically coupled in a simple rate change — play audio faster and both go up. Pitch shifting separates them using a phase-vocoder: the algorithm analyses the signal in the frequency domain, shifts the spectral content, and resynthesises at the original tempo. The result is a different pitch with the same duration.
The quality of phase-vocoder pitch shifting is good for small shifts and degrades for large ones. On vocal material, a shift of two or three semitones is usually clean. At six semitones the formant structure of the voice starts to shift along with the pitch in a way that sounds artificial — the vowels take on a different character. At twelve semitones the artefacts are pronounced on most material. For creative voice effects this is sometimes the point; for transparent transposing, keep shifts small.