Online Tone Generator
Play any frequency instantly, right in your browser. Type or slide to the exact hertz you want, or use the one-tap presets for the most loved healing tones — 432 Hz, 528 Hz and the full solfeggio scale.
Everything runs locally with the Web Audio API: no downloads, no signup, and the tone is mathematically pure — useful for sound-healing practice, tuning instruments, testing speakers, or simple curiosity.
Prefer real music at these frequencies?
A pure tone is a taste — a full composition is a bath. Our catalog is real healing music tuned to these exact frequencies, free on every platform.
Frequently asked questions
Is this tone generator really free?
Yes — completely free, no signup, no downloads. The audio is generated locally in your browser with the Web Audio API.
What frequency should I start with?
432 Hz and 528 Hz are the most popular for relaxation and calm. For sleep, many listeners layer a low tone or use our binaural beats generator with a delta-range beat.
Can I leave it playing for hours?
Yes. Use the built-in sleep timer (up to 8 hours) and keep the volume gentle — quiet and sustained beats loud and short.
More free sound tools
These tools support relaxation and wellness practice. They are not medical devices and don't treat any condition — for persistent sleep, hearing or anxiety concerns, please talk to a healthcare professional.