Tools › Audio

Convert music to 432 Hz

Retune any song from standard A = 440 Hz to A = 432 Hz without changing its tempo. Save as MP3, FLAC or WAV, nothing is uploaded.

Drop a song, voice note or videoor click to choose · MP3, WAV, M4A, FLAC, MP4…

Presets

Speed1.00×

Pitch+0 semitones

Keep the original key when changing speed

How it works

Tempo is changed with WSOLA: the audio is cut into short overlapping grains which are lined up so their waveforms join without clicks.
Pitch is shifted by stretching and then resampling with a band-limited filter, so voices stay clean and nothing aliases.
Untick “keep the original key” for the classic slowed or sped-up sound where pitch follows speed.

How do I practice a song slower?

Use the Practice preset (0.75×). The key stays the same, so you can play along.

What does 432 Hz do?

It lowers the pitch by about a third of a semitone so that A sounds at 432 Hz instead of 440 Hz. Tempo doesn’t change.