The 432Hz converter that never uploads your music
Drop a song, hear the original and the 432 Hz version side by side, download it. It runs in your browser, so nothing leaves your device.
Convert once, or listen live
The player retunes any file, stream or radio station while it plays, so there are no files to manage and no second copy of your library. The converter is for when you need a file: another music app, a car, a mix you are sending to someone.
Why no upload
Private by construction
The file is decoded, retuned and encoded on your own device. There is no server to send it to, so there is nothing to store, leak or delete.
No queue
You are not waiting behind other people's uploads. The render starts the moment you press the button and runs as fast as your machine does.
No caps set by server cost
The limits on this page come from browser memory, not from bandwidth bills, so a Pro conversion can run to ten minutes at full quality.
Nothing recompressed on the way
Your file is decoded once and encoded once, to the MP3 or 16-bit WAV you choose. No transfer, no intermediate copy.
Converters that work from a link depend on a video site that changes without notice, and they stop working when it does. A file on your device does not.
What each tier includes
| Feature | Free | Account | Pro |
|---|---|---|---|
| Conversions per day | 1 | 5 | Unlimited |
| Track length | 5 min | 5 min | 10 min (5 on phones) |
| Tunings | 432 Hz | 432, 440, 396 and 174 Hz | All of those, plus 528 (A=444), 444 and any A from 400 to 480 Hz |
| Engine | Classic | Classic | Classic and Studio |
| Output | MP3 192 kbps or 16-bit WAV | MP3 192 kbps or 16-bit WAV | MP3 192 kbps or 16-bit WAV |
| Upload | Never | Never | Never |
An account only needs an email address. Pro is the same subscription as the player.
Questions
Is my music uploaded anywhere?
No. The page runs the whole conversion inside your browser with the Web Audio API. Your file never leaves your device, and we never see it.
What is the difference between 432 Hz and 440 Hz?
Concert pitch sets the A above middle C. Most recordings use A=440 Hz; 432 Hz tunes that A about 32 cents lower, a little under a third of a semitone. Everything else in the music keeps its relationships; the whole track just sits slightly lower. Many listeners describe it as warmer. It is a listening preference.
What does 528 Hz mean here?
528 is the name of a tuning where the C above middle C lands on 528 Hz. That happens when A is set to 444 Hz, so choosing 528 applies A=444, a lift of about 16 cents. A literal A=528 would be a minor third up, which is a different song. The label says which one you get.
Does the quality drop?
The retune is a pitch shift of less than a semitone with the tempo held, done in 32-bit float on a decoded copy of your file. Classic uses the same SoundTouch engine as the player; Studio, for Pro, is a higher fidelity spectral engine. WAV output is 16-bit PCM, uncompressed; MP3 is encoded once at 192 kbps.
Why is there a length limit?
The browser holds several copies of the track in memory as 32-bit float: the decoded audio, a padded copy for the engine, the rendered result and the encoder input. Ten minutes of stereo at 44.1 kHz is well over 400 MB that way. Desktops manage that; phones do not, which is why the cap is five minutes there even on Pro. For anything longer, the player retunes it live with no limit.
Which formats can I convert?
Anything your browser can decode: MP3, WAV, FLAC, M4A and AAC, OGG and Opus, up to 150 MB. Output is MP3 at 192 kbps or 16-bit WAV. There is one setting per format on purpose; there is no quality tier to pay for. Files with more than two channels are mixed down to stereo.
Does it change the tempo?
No. Pitch and tempo are shifted independently, so the retuned file is exactly as long as the original and stays in sync with any video or lyrics you had.
Should I convert my files or just use the player?
If you listen here, use the player: it retunes any file, stream or radio station live and there is nothing to store. Convert when you need a file that works elsewhere, such as another music app, a car, or someone you are sending it to.