A tone generator plays a single, steady frequency, and that turns out to be useful in lots of everyday situations. Use it to tune an instrument to A4 = 440 Hz, test speakers and headphones (including whether the left and right channels are wired correctly), find a rattle in your car or room, check the low end of a subwoofer, or roughly explore the range of your hearing. This free online tone generator creates sound directly in your browser with the Web Audio API. Set any frequency from 1 Hz to 20,000 Hz by typing it, using the logarithmic slider or nudging it with the ±1 Hz and octave buttons, or jump to a musical note. Choose a sine wave for a pure tone, or square, sawtooth or triangle for richer sounds. Pan the sound left or right, or use sweep mode to glide smoothly between two frequencies. Please protect your hearing: start with the volume low, especially on headphones, because pure tones can sound louder than music, and very high or very low tones can be loud even when you barely hear them. Your device's speakers may not reproduce very low or very high frequencies. That's normal and not a fault in your ears.
Generate a tone
Sweep mode
⚠️ Start quiet. Long or loud exposure to tones can damage hearing.
How to use the tone generator
- Turn your device volume down first.
- Type a frequency or choose a note, then press Play.
- Raise the volume gradually.
- Use Balance to test the left and right speakers, or Sweep to scan a range.
Useful frequencies
- 440 Hz: A4 tuning reference.
- 50–60 Hz: mains hum; subwoofer check.
- 1 kHz: standard test tone.
- Above 15 kHz: many adults can’t hear these.
FAQ
Can I test my hearing range with this?
Only roughly. Speakers, volume and room all affect results, so see an audiologist for a real hearing test.
Why can’t I hear very low tones?
Small speakers and laptop drivers can’t reproduce deep bass, so try headphones or a subwoofer.
Which waveform should I use?
Sine for a pure tone and testing; the others contain harmonics and sound buzzier.
Is it safe?
Keep the volume low and sessions short. Never play loud tones on headphones.
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