Online Tone Generator

Generate a sine, square, triangle or sawtooth tone at any frequency — play it or download a WAV.

How do I generate a specific frequency sound?

Enter the frequency in hertz (440 Hz is the musical note A4), pick a waveform, duration and volume, and press Generate. The tone is synthesised in your browser and plays in a loop; you can also download it as a WAV file.

Uses

Tuning instruments (A4 = 440 Hz).
Testing speakers, headphones and subwoofers (20–100 Hz).
Hearing tests and tinnitus frequency matching — start quietly.

Square and sawtooth waves contain strong harmonics and sound much louder than a sine wave at the same volume.

Frequently asked questions

What frequencies can people hear?

About 20 Hz to 20,000 Hz; the upper limit drops with age.

Can it damage my speakers?

Very loud low or high frequencies can — keep the volume moderate.

Is the file free to use?

Yes.