| Frequency | What it is | Use it for |
|---|---|---|
| 50–60 Hz | Mains hum | Checking subwoofers and bass. |
| 165 Hz | Water eject tone | Pushing water out of phone speakers. |
| 440 Hz | Note A4 | Tuning instruments. |
| 1 kHz | Standard test tone | Checking audio levels. |
| 10–17 kHz | High tones | Simple hearing range checks. |
Free · 1 Hz – 20 kHz · 4 waveforms
Online tone generator: play any frequency
Type a frequency or drag the slider, choose a waveform and press Play. You can change the tone while it plays. The link in your address bar saves your setting.
Short answer
Type the frequency in hertz, pick a waveform and press Play. For water in a speaker, use 165 Hz. For tuning, 440 Hz is the note A4.
Useful frequencies
Sine, square, triangle and sawtooth
Sine is the purest tone: one frequency and nothing else. Use it for tests and water eject.
Square sounds buzzy and hollow, like old video games. It carries extra high overtones, so it seems louder at the same volume.
Triangle sits between sine and square: soft, with a little edge.
Sawtooth is bright and harsh. It has every overtone, which makes it good for hearing problems like rattles in a speaker.
Tone generator FAQ
How do I share a tone?
Copy the address from your browser. It includes the frequency and waveform, for example #f=165&w=sine.
Why can't I hear very low tones?
Small speakers can't play much below 100–150 Hz. Use headphones or a bigger speaker to hear bass tones.
Is a high tone safe?
Keep the volume low and don't play loud high tones for long. They can be uncomfortable, and pets hear them more than people do.
Can I use it for tinnitus matching?
You can use it to find the pitch you hear, but talk to a doctor or audiologist for advice about tinnitus.