Retune music to 432 Hz

Most music is tuned so the note A sits at 440 Hz. This retunes the whole recording so A lands on 432 Hz, a shift of −31.77 cents, about a third of a semitone. Everything sounds slightly lower and warmer.

Pure retune lowers pitch the way slowing a record does. It is the highest fidelity option, and the track runs about 1.9% slower. For video, we slow the picture by exactly the same amount, so sound and image stay in sync.

Same tempo keeps the length identical and shifts only the pitch. Best when the audio has to match existing video or a DJ set.

Because the work happens in your browser's memory, not on a server we can scale. Files can be up to 1 GB, and we run one conversion at a time. It's the cost of the privacy guarantee, not an upsell.

The real limit is length, not size. Decoded audio takes about 21 MB per minute of memory, so we cap it around 15 minutes on a computer and 8 on a phone. A 1 GB video is usually fine, because its picture is copied across untouched and never decoded, so only its (much smaller) soundtrack has to fit in memory.

Honestly, no. There's no solid evidence that 432 Hz tuning has health or healing effects. Claims you'll find elsewhere are marketing, not science. Plenty of people simply like how it sounds, and that's a perfectly good reason. We'd rather tell you the truth and let your ears decide.

Open DevTools, watch the Network tab, and convert a file you dropped in: after the page loads you'll see zero requests. It even works in airplane mode.

The one exception is the "paste a link" box. Your browser can't download from YouTube by itself, so a link is fetched by our server and streamed straight back. We don't store it or log it. Files you drop in never touch a server. Links do.