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. A quick hearing check is the easiest way to see whether any speech frequencies are harder to detect.

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. A bass test reveals whether your bass extension is cutting out above or below its rated frequency.

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. Use the microphone test to confirm your microphone is working before a call, recording, or stream.