Tone Generator

Generate a precise audio tone at any frequency from 20Hz to 20kHz. Choose from sine, square, sawtooth, or triangle waveforms and select musical note presets for quick reference. Use the online hearing test for a quick screening before deciding whether to see an audiologist.

Quiet Loud
Select a waveform, set the frequency, then press Play.
Waveform
Frequency
440 Hz
20 Hz 1 kHz 5 kHz 20 kHz
Note Presets

What Is a Tone Generator?

A tone generator produces a pure audio signal at a precise frequency, letting you calibrate audio equipment, tune instruments, test speaker response, or explore how different waveforms sound. Use the microphone test to confirm your microphone is working before a call, recording, or stream.

Sine waves produce the purest tone with no harmonics. Square and sawtooth waves introduce harmonics that let you check how your speaker or headphone handles complex waveforms at any pitch. A sine sweep from the frequency sweep test is more efficient than testing individual frequencies one by one.