432 Resonance Tuner
Convert any song to 432 Hz.
Drop a song here
or click to choose · mp3, wav, flac, m4a, ogg, opus, webm
Your file stays in your browser's memory
Never uploaded to a server
Turn off your internet before dropping a song to see for yourself.
Hear it for yourself
Every song on my Suno page (@arnarb) has been run through 432 Resonance Tuner. Listen and compare against any commercial track at 440 Hz — the difference is audible if your ear is sensitive to it.
Got a whole library?
The desktop version converts entire folders at once — same per-song detection as the web app, built for batch. Free, runs entirely on your computer.
✓ Detects your song's actual frequency
Most "432 Hz converters" blindly shift every song by ~32 cents, assuming the source is exactly 440 Hz. Songs mastered at 438, 441, 444 — or any of the wide range you actually find in the wild — end up wrong. 432 Resonance Tuner analyzes your song first and shifts by the exact amount needed to land at 432.
✓ Your music never leaves your device
All processing runs in your browser. No upload, no account, no server, no tracking. Your files stay yours — perfect privacy by design. Want proof? Turn off your internet before converting — it still works.
✓ Zero artifacts
Other pitch shifters cut your music into tiny slices and reassemble them. This creates subtle artifacts — hollow sound, faint pulsing, stereo drift — especially on ambient and sustained music. 432 Resonance Tuner takes a different approach: it recalculates every sample in one continuous mathematical operation. The output is identical to the original, just at a different pitch. No slicing, no reassembling, no artifacts.
The only trade-off: tempo shifts by about 1.8% — well below the threshold of human perception. Every major pitch-shifting method was tested against this approach — including the library used by Audacity and professional DAWs — and mathematical resampling produced the cleanest result on every track.
The ideal solution would be to fully analyze a song — every instrument, every note, every effect — and rebuild it from scratch at 432 Hz, as if the artist had recorded at that tuning. That level of AI audio reconstruction doesn't exist yet. Until it does, mathematical resampling is the highest-fidelity method available.