Tone Generator
A precise signal generator for testing speakers and headphones, checking your hearing range, and tuning — any frequency, any waveform.
440Hz
How to use the tone generator
Drag the frequency slider or tap a preset, choose a waveform, and press Play tone. Start with the volume low — pure tones can be surprisingly loud, and high frequencies especially can strain small speakers. Sweep up and down to hunt for rattles, buzzes, or a frequency where your speaker distorts.
Frequently asked questions
What is a tone generator used for? +
A tone generator plays a pure sound at an exact frequency. It's used to test speaker and headphone frequency response, find rattles and buzzes, tune instruments, test hearing range, and — at low frequencies — help clean water and dust out of speakers.
What's the difference between the waveforms? +
Sine is a pure, smooth tone with a single frequency. Square, triangle, and sawtooth waves add harmonics, giving a buzzier, richer sound that's useful for stress-testing speakers and hearing distortion.
What frequency range can humans hear? +
Typical human hearing spans about 20 Hz to 20,000 Hz (20 kHz). High-frequency hearing declines with age, so many adults can't hear above 15–17 kHz. Try the presets to test your own range.