# Generate a tone at any frequency

> Pick a frequency from 20 Hz to 20 kHz, a wave shape and a side, and hear it at once. Starts quiet.

Free online tone generator from 20 Hz to 20 kHz with sine, square and sawtooth waves, log sweeps and a hearing test. Every tone is made in your browser.

- Tool: [Tone generator](https://fixmint.cc/tone-generator)
- Category: [Device checks](https://fixmint.cc/device-tests)
- Fixes: I need a pure tone or sweep
- Runs in the browser: files and text stay on the device, no sign-up, free.

## How to generate a tone

1. Set the frequency with the slider, the number box, a preset or the − and + buttons.
2. Choose a wave shape, the side and a quiet volume.
3. Press Play, and press Stop when you are done.

## Questions

### What frequency is the note A4?

A4 is 440 Hz in the usual concert pitch standard. Some orchestras tune slightly higher, so the note may sound a little sharp to you.

### Can this test my hearing?

Only roughly. The hearing test sweeps up from 8 kHz and stops where you tap. Your speakers, your volume and background noise all change the result, and it is not a medical test. Hearing near the top of the range usually fades with age.

### Why does my highest tone stop below 20 kHz?

A device cannot play a tone above half its sample rate. Most computers and phones run at 44.1 or 48 kHz, so the top is about 22 kHz or 24 kHz, and speakers and headphones often roll off well before that.

### Why is my mains hum 50 Hz or 60 Hz?

Mains electricity alternates at 50 Hz in most of the world and at 60 Hz in much of the Americas. Poor wiring, cheap power supplies and some amplifiers leak that hum into sound.

## Related tools

- [Speaker test](https://fixmint.cc/speaker-test): Is sound coming from both sides?
- [Microphone test](https://fixmint.cc/microphone-test): Can they hear me?
- [Metronome](https://fixmint.cc/metronome): Keeping a steady tempo
- [Keyboard test](https://fixmint.cc/keyboard-test): Some keys don’t respond