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Online tone generator

Pick a frequency and a waveform, then press play. Handy to test a speaker, tune an instrument, check your hearing range or play your own cleaning tone.

165HzPick any frequency, 20 Hz to 20 kHz

60%

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How to use it

  1. 1Move the slider or type a frequency in Hz.
  2. 2Choose a waveform. Sine is the purest and the gentlest.
  3. 3Set the volume and press Play.
  4. 4Change the frequency while it plays to hear the difference.

Useful frequencies

  • 165 Hz: the classic speaker cleaning tone
  • 440 Hz: A4, the standard tuning note
  • 50 / 60 Hz: mains hum, to track down a ground loop
  • 1 kHz: reference tone for audio levels
  • 8 to 17 kHz: hearing test range

Sine, square, triangle or sawtooth?

A sine wave is one pure frequency. Square and sawtooth waves add strong harmonics: they sound buzzy and louder at the same volume, so turn the volume down before you switch. Triangle sits in between.

Questions people ask

What frequency gets water out of a speaker?

Between 150 and 250 Hz. Use Water mode for an automatic sweep with pulses, or set 165 Hz here with a sine wave.

Is it safe for my ears?

Keep the volume moderate, and avoid headphones at high volume above 8 kHz. Stop if it feels uncomfortable.

Why do some frequencies sound louder?

Ears are most sensitive between 2 and 5 kHz, and every speaker has its own response. The same volume can sound very different.

Does the tone generator work offline?

Yes. Once the page has loaded, the sound is generated by your device.