Handy tools
Tone Generator
A free online tone generator that plays a pure sine, square, sawtooth, or triangle tone from 20 Hz to 20,000 Hz.
Play a steady pure tone at any frequency from 20 Hz to 20,000 Hz right in your browser. Use it to test speakers and earphones, get a reference pitch, or roughly check which high tones you can still hear — it's not a medical hearing test.
Volume starts at 30%. Turn it down before you press Play, especially with earphones, then raise it slowly — loud high tones can harm your hearing, and the square wave sounds louder than a sine at the same setting. Drag the slider or type an exact frequency; changes apply instantly.
Preset
Waveform
Channel
Volume · 30%
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A free online tone generator and frequency generator that plays a steady pure tone from 20 Hz to 20,000 Hz right in your browser. Pick a waveform (sine, square, sawtooth or triangle), set the exact frequency with the slider, a typed value or one of six presets, adjust the volume, and send the sound to the left ear, the right ear or both. Use it to test speakers and earphones, get a reference pitch for tuning, make a mosquito tone, or roughly check which high frequencies you can still hear. It is not calibrated, so it is no substitute for a hearing test by an audiologist. Everything runs on your device with no install or sign-up. Volume starts at 30%; lower it before playing through earphones, since loud high tones can harm your hearing.
Frequently Asked Questions
Q. What frequencies can the tone generator play?
A. Any frequency from 20 Hz to 20,000 Hz. Type an exact value, drag the slider or tap a preset (60, 440, 1,000, 4,000, 8,000 or 15,000 Hz); changes apply live while the tone plays.
Q. Which waveforms and channels are available?
A. Sine, square, sawtooth and triangle, sent to the left ear, the right ear or both. The sine is the pure tone; the square wave sounds noticeably louder and harsher at the same volume setting.
Q. Can I use it to check my hearing?
A. Only roughly. It shows which high tones you can still hear, but it is not calibrated and is not a medical hearing test. Small phone and laptop speakers often can't reproduce very low tones, so silence at 20–60 Hz may come from the speaker, not your ears.
Q. Is it safe for my ears?
A. Volume starts at 30%. Turn it down before pressing Play, especially with earphones, raise it slowly, and stop if the sound feels uncomfortable — loud high frequencies can harm your hearing.