Tone Generator
Play a pure tone from 20 Hz to 20,000 Hz in sine, square, triangle or sawtooth wave, with frequency sweeps and presets.
About Tone Generator
This tone generator online plays a pure tone at any frequency from 20 Hz to 20,000 Hz. Set the frequency with the slider or type an exact value, choose a sine, square, triangle or sawtooth wave, and press Play. Presets cover common tones such as 440 Hz and 432 Hz, and a sweep glides between two frequencies.
Use it as a frequency generator to test speakers and headphones, tune instruments, find rattles in a room, or run a simple check of which high frequencies you can hear. It is not a medical hearing test. Start with the volume low. It runs in your browser and is free with no sign-up.
How to use Tone Generator
- Set the frequency with the slider or type an exact value.
- Choose a waveform and keep the volume low to start.
- Click Play, or use a preset or a sweep between two frequencies.
Frequently asked questions
What is the mosquito tone?
A 17.4 kHz tone that many adults cannot hear because high-frequency hearing declines with age. Laptop and phone speakers may not reproduce it at all.
Can this damage my hearing or speakers?
Loud high or very low tones can. Start at low volume, avoid long listening with headphones and stop if anything feels uncomfortable.
What is a sweep useful for?
Sweeping from 20 Hz to 20 kHz helps find rattles, resonances and the frequency range your speakers or ears can reproduce.
What is a tone generator used for?
It produces a steady sound at a set frequency, which is useful for testing speakers, headphones and microphones, tuning instruments, science experiments and checking your hearing range.
How do I play a 432 Hz tone?
Type 432 in the frequency box or pick the preset, choose a sine wave and press Play.
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