Tone & Binaural Beat Generator
Generate test tones and binaural beats in your browser — sine to sawtooth, 20 Hz to 20 kHz, sweeps, noise, sleep timer and WAV export.
⚠️ Start quiet. Pure tones at high volume can damage hearing, and you cannot judge loudness from the slider alone — turn your device down before pressing Play.
Focus the slider and use ← → to step, Shift for 1 Hz, Ctrl for 0.01 Hz.
Two slightly different tones, one per ear — headphones required, the beat only exists in your head.
How to use
Two generators in one. The Tone Generator tab makes a single pure tone — pick a waveform, dial a frequency from 1 Hz to 24 kHz, and send it to both ears or one. Use it to test speakers and headphones, find a room's resonant frequency, check the top of your hearing range, or tune an instrument against a reference pitch. Turn on Sweep to glide from one frequency to another over a set time — a logarithmic sweep is the usual choice for audio gear because it spends equal time per octave.
The Binaural Beats tab plays two close-together tones and lets the difference between them become the beat. Binaural mode puts one tone in each ear and needs headphones — the beat is created by your brain, not your speakers. Isochronic pulses a single tone on and off, and Monaural mixes both tones together before they reach your ears; those two work fine on speakers. Add a white, pink, or brown noise bed underneath, and set a timer if you are using it to fall asleep.
Everything is synthesised live in your browser with the Web Audio API — nothing is uploaded, nothing is downloaded from a server, and Download WAV renders the exact settings on screen to a 16-bit stereo file you can keep.
Hearing safety
Pure tones are deceptive: a sine wave at a level that feels mild can still be loud enough to cause damage, and very high or very low frequencies feel quieter than they measure. Start at a low volume and raise it slowly. If you hear ringing afterwards, stop. Binaural beats are not a medical treatment — if you have epilepsy, a seizure disorder, or a pacemaker, talk to a doctor before using rhythmic audio entrainment.