Tone / Frequency Generator
Play a pure tone at any frequency from 20 Hz to 20 kHz — sine, square, triangle or sawtooth — or sweep the range to test speakers and hearing.
How to use
- 1Set the frequency with the slider or type it in, and choose a waveform.
- 2Press Play. Start at low volume — high frequencies can be unpleasant.
Frequently asked questions
What's the range of human hearing?
About 20 Hz to 20 kHz for young people; the upper limit falls with age, often to 12–15 kHz for adults.
Can this damage my hearing or speakers?
Loud tones can. Start quiet, avoid long exposure, and be careful with low frequencies on small speakers.
What is 440 Hz?
The note A above middle C — the standard tuning pitch.