How to convert audio to 432 Hz
- Add your file. Drop any MP3, WAV, OGG, M4A or FLAC track into the tuner above, or tap to browse. Nothing is uploaded — everything runs on your device.
- Click Convert. The tool resamples the audio at a 432/440 ratio, lowering standard 440 Hz concert pitch to 432 Hz while preserving audio quality.
- Download. Save the retuned track as a 16-bit WAV file at the original sample rate, ready to play anywhere.
Frequently asked questions
What does a 432 Hz converter do?
It lowers the pitch of music recorded at the standard A = 440 Hz concert pitch down to A = 432 Hz. Retune 432 does this by resampling the audio at a 432/440 ratio, lowering the pitch by 31.77 cents — the standard method used by 432 Hz retuning tools.
Are my audio files uploaded to a server?
No. All processing happens locally in your browser using the Web Audio API. Your files never leave your device, which makes the tool fast and completely private.
Which audio formats are supported?
You can load MP3, WAV, OGG, M4A and FLAC files (any format your browser can decode). The converted file is downloaded as a 16-bit WAV at the original sample rate.
Does converting to 432 Hz change the length of the track?
Yes, slightly. Resampling at the 432/440 ratio makes the track about 1.85% longer, which preserves audio quality without time-stretching artifacts.
Is the 432 Hz converter free?
Yes. Retune 432 is completely free, requires no signup, and works on any device with a modern browser, including phones and tablets.