20 Hz
minimum frequency
Precise browser audio
Free Tone Generator Online
An online tone generator creates a steady sound at a frequency you choose. Play reference tones or short sweeps from 20 Hz to 20 kHz directly in your browser.
20 kHz
maximum frequency
Local
browser playback
Tone controls
No autoplay. You control every start and stop.
Ready. Playback begins only after you press Play tone.
Frequency sweep
Move smoothly between two frequencies for a short speaker or audio experiment.
Four safe steps
How to use the tone generator
- 1
Lower your device volume and choose a frequency or reference preset.
- 2
Choose a waveform and keep the in-tool output level low.
- 3
Select Play tone, then raise volume only as much as needed.
- 4
Stop the tone when finished, or set two frequencies to run a short sweep.
Private by design
Audio stays on your device
The Web Audio API creates each tone in this browser tab. No recording, audio file, frequency choice, or playback setting is uploaded to ChatSpark.
Results vary by hardware. A phone speaker may not reproduce deep bass or very high frequencies accurately, so use this as a practical reference rather than calibrated test equipment.
Common questions
Tone generator FAQ
What is an online tone generator?
An online tone generator uses your browser to create a steady sound at a chosen frequency. It can provide reference tones for audio experiments, basic speaker checks, and instrument practice.
What frequency range can this generator play?
The controls accept 20 Hz through 20 kHz, the usual stated range of human hearing. Your device, speakers, headphones, and hearing may reproduce a smaller range.
Is a tone generator safe to use with headphones?
Start at the lowest practical volume, keep sessions short, and stop immediately if a tone feels uncomfortable. High volume and prolonged test tones can harm hearing.
Why can I not hear very low or high frequencies?
Small speakers often cannot reproduce deep bass, and many devices roll off very high frequencies. Hearing sensitivity also varies, so silence does not prove that the generator is broken.
What is the difference between the waveforms?
A sine wave contains one main frequency. Square, sawtooth, and triangle waves add different harmonic patterns, so they sound brighter or sharper at the same fundamental frequency.
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