Online Tone Generator

×½ ×2


To play a constant pure tone (sine wave), click Play or press Space. To change the frequency being played, drag the slider or press (arrow keys). To decrease/increase the frequency by 1 Hz, use the and buttons or press Shift + ← and Shift + →. To halve/double the frequency (go down/up one octave), click ×½ and ×2. You can mix tones by opening the Online Tone Generator in several browser tabs.

What can I use this tone generator for?

Tuning instruments, science experiments (what’s the resonant frequency of this wineglass?), testing audio equipment (how low does my subwoofer go?), testing your hearing (what’s the highest frequency you can hear? are there frequencies you can hear in only one ear?).

Tinnitus frequency matching

If you have pure-tone tinnitus, this online frequency generator can help you determine its frequency. Knowing your tinnitus frequency can enable you to better target masking sounds and frequency discrimination training.

When you find a frequency that seems to match your tinnitus, make sure you check frequencies one octave higher (frequency × 2) and one octave lower (frequency / 2), as it is easy to confuse tones that are one octave apart.


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Created by Tomasz P. Szynalski.