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    Tone Generator

    Play any frequency from 20 Hz to 20 kHz online free, with sine, square, triangle or sawtooth waves. Free online tone generator and left/right speaker test.

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    Found it useful? Share Tone Generator

    Free, no sign-up, works in the browser — send it to a friend or add it to your site.

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    How to use Tone Generator

    1. 1Set a frequency with the slider (log scale), the number box or a preset like A4 440 Hz
    2. 2Pick a waveform and play it through the left speaker, right speaker or both
    3. 3Press Play tone — change frequency, volume and balance live — or run a 20 Hz → 20 kHz sweep to test speakers and hearing range

    Frequently asked questions

    How do I test left and right speakers?▾

    Choose ◀ Left or Right ▶ and press Play. The tone should come only from that side. If it comes from the wrong side, your headphones or speaker cables are swapped.

    What frequencies can humans hear?▾

    Roughly 20 Hz to 20 kHz for young people. The upper limit drops with age — most adults hear up to about 15–17 kHz. Use the sweep to find where the sound fades for you.

    What is 440 Hz?▾

    440 Hz is the note A above middle C (A4), the international tuning standard for musical instruments.

    What is the difference between sine, square, triangle and sawtooth waves?▾

    A sine wave is a pure tone. Square and sawtooth waves add many harmonics and sound buzzy; a triangle wave is in between. Sine is best for hearing and speaker tests.

    Is it safe?▾

    Start at low volume, especially with headphones and very high or very low frequencies, and stop if anything is uncomfortable.

    Embed Tone Generator on your website▾

    Paste this snippet into your page. The embedded tool runs in your visitor's browser and shows a small “Powered by clkr.work” link.