Pitch Shifter & Changer

How to change the pitch of a song without changing speed

A pitch changer (also called a pitch shifter or transposer) moves every note in a recording up or down by the same interval while leaving the tempo and duration untouched. Raising pitch by playing audio faster also shortens it — that's resampling. A true pitch changer decouples the two: the audio is time-stretched by the pitch ratio, then resampled back by the same ratio, so frequencies move up or down while duration stays identical. This tool implements that pipeline with a phase-vocoder.

Musically, +1 semitone is the smallest step in Western music; ±12 semitones transposes a full octave. Typical uses: matching a song to a vocalist's comfortable range, transposing samples into a project key, or converting a track between keys for harmonic mixing.

Pitch shifter vs pitch changer vs transpose: what's the difference?

In practice the three terms are used interchangeably: all describe moving audio in pitch without changing tempo. 'Transpose' leans musical — moving a song from one key to another, like from C major to D major (+2 semitones). 'Pitch shift' leans technical — the DSP that re-synthesizes frequencies. If you want to change the key of a song, you transpose it; the underlying processing is pitch shifting. This tool does both, in semitone steps.

Pitch shifting vs speed changing

Speed changing alters duration (optionally preserving pitch); pitch shifting alters frequencies while preserving duration. If you want the song faster but sounding the same, use the Speed Changer. If you want it in a different key at the same tempo, you're in the right place.

What to expect quality-wise

Shifts up to ±4 semitones usually sound clean on full mixes; beyond ±7 semitones, phase-vocoder artifacts (slight smearing of transients, 'underwater' texture on cymbals) become more audible. Sparse material (solo piano, vocals) shifts more gracefully than dense walls of sound. For extreme transpositions, rendering stems separately gives better results than shifting the full mix.