Frequency & Tone Generator
Play a precise audio tone at any frequency and waveform — useful for testing audio equipment, tuning, or hearing checks.
Start at a low volume — sustained tones at high volume can be uncomfortable or harmful to your hearing.
Your files are processed locally in your browser. They are not uploaded to our servers.
How to use
- Set the frequency using the slider or a preset.
- Choose a waveform — sine, square, sawtooth or triangle.
- Adjust the volume and click Play to hear the tone.
What is this tool?
Frequency & Tone Generator uses the Web Audio API's oscillator to produce a precise, continuous tone at any frequency between 20Hz and 20kHz, in your choice of waveform. It's a browser-based alternative to a physical signal generator for quick audio testing tasks.
Common uses
- Testing speakers, headphones or an audio system for frequency response
- Tuning an instrument against a reference pitch
- Basic hearing range checks
- Generating a test signal for audio equipment troubleshooting
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FAQ
What's the difference between the waveforms?
Sine is a pure, smooth tone with a single frequency. Square, sawtooth and triangle waves are richer in harmonics and sound more buzzy or edgy — useful for different testing purposes.
Is it safe to listen to high-frequency tones?
Keep the volume low, especially at high frequencies, since perceived loudness can be misleading and prolonged exposure to loud tones can damage hearing.
Why can't I hear very low or very high frequencies?
Human hearing typically ranges from about 20Hz to 20kHz, and this range narrows with age — frequencies near the edges may be inaudible or very faint even at higher volumes.