Drop an MP3 or WAV and get it back retuned to A = 432 Hz. Everything happens in your browser: your files never leave your device.
Most music is tuned with the note A at 440 Hz. Converting to 432 Hz lowers the whole track by 31.77 cents, a little less than a third of a semitone, so A lands on 432 Hz.
No. Decoding, retuning and encoding all run inside your browser. Nothing is sent to a server.
Yes, slightly. Tune432 retunes like a turntable running a bit slower: pitch and tempo drop together by about 1.8%. This keeps the sound clean with no stretching artifacts.
It tunes the track so that C5 sits at 528 Hz, which puts A at 444 Hz. It raises the track by about 15.67 cents.
Yes, with MP3 output. Title, artist, album, year, genre, track number, cover art and lyrics are copied from your original file. If the original has no lyrics or cover, there is nothing to copy. WAV files carry no tags.
There is no solid scientific evidence for health effects. Many listeners simply prefer the warmer, lower sound. Tune432 is a listening tool, not a medical one.