How to convert MP3 to 432 Hz

The short answer

• One song or a few: Song Retuner — free, runs in your browser, no account needed. Upload MP3 (or WAV, FLAC, M4A, OGG), pick 432 Hz, download the retuned file.
• Your whole library: HZ Detect — a desktop app for Mac or Windows that scans music folders, detects each file's current tuning, and batch-converts to 432 Hz (or any Solfeggio target).

Option 1: Song Retuner (free, one file at a time)

Best for someone who has a single song — a favorite track, a worship song, a meditation piece — that they want to retune and keep.

1. Open songretuner.com in your browser.
2. Upload the file. Supported formats: MP3, WAV, FLAC, M4A, OGG. File size up to ~200 MB.
3. Pick 432 Hz from the dropdown.
4. Click Retune Now, preview the result, then download as WAV or MP3.

Everything happens in your browser — nothing uploads to a server. Free, no account.

Option 2: HZ Detect (batch convert whole libraries)

Best for someone with a music library on disk — a Rekordbox or iTunes folder, a Downloads folder of albums, or a drive of MP3s. HZ Detect scans the whole folder, measures the current tuning of each file, and converts whichever files you choose.

1. Install HZ Detect:
   • Mac App Store · Microsoft Store
   • Or direct: Mac .dmg · Windows .exe
2. Point it at a music folder. Detection and library analysis are free.
3. Pick the target frequency (432 Hz, 528 Hz, 440 Hz, or any Solfeggio target).
4. Select the files to convert and run batch retune. All on-device — no upload.

Pricing: Free detection and analysis + 5 free retune credits. Retune credits: Album $9.99 (25), Playlist $24.99 (100), Collection $59.99 (500), or Unlimited $99.99 one-time. Credits never expire.

Will the audio quality drop?

A good retuning tool preserves the song. The melody, lyrics, rhythm, and vocal character stay intact; only the pitch foundation shifts. Both Song Retuner and HZ Detect use high-quality pitch processing. Poor pitch-shifters can introduce warbling or artifacts — neither of these does.

What file formats can I convert?

• Song Retuner: MP3, WAV, FLAC, M4A, OGG as input; MP3 or WAV output.
• HZ Detect: all common audio formats on Mac and Windows.

Can I convert to Solfeggio frequencies, not just 432 Hz?

Yes. Both tools support the full Solfeggio set — 174, 285, 396, 417, 432, 528, 639, 741, 852, 963 Hz — plus standard 440 Hz if you want to shift back.

Alternative: play without converting

If you'd rather listen to your library retuned live without creating new files, consider the Solfeggio Frequencies Player (all 10 frequencies) or a single-frequency Player Plus app. Both play your existing library through the chosen tuning without touching the original files.