An online tone generator & hearing test

Frequently asked questions

What can I use a tone generator for?

Playing a precise, steady frequency is useful for testing the range of speakers, headphones, or subwoofers, checking for rattles, tuning by ear, finding a resonant frequency in a room, or generating reference pitches. You can pick the exact frequency and the waveform.

What do the different waveforms sound like?

A sine wave is the purest, smoothest tone. Square, triangle, and sawtooth waves add harmonics, so they sound progressively brighter and buzzier at the same frequency — square and sawtooth are the harshest, triangle is in between.

How does the hearing test work?

It plays tones that rise in frequency from 8 kHz upward. You tell it when you can no longer hear the tone, and it reports the highest frequency you heard. Because people lose the ability to hear very high frequencies with age, this gives a rough, for-fun estimate — it is not a medical hearing test.

Any safety tips?

Start at a low volume, especially for high frequencies, and be careful with headphones — loud tones can be uncomfortable or harmful. This tool keeps the level modest, but always turn it up gradually.

Is it free and private?

Yes. The tones are generated in your browser with the Web Audio API — nothing is uploaded, and there's no sign-up.