A free tool
Make a binaural beat in your browser
Two tones, one in each ear, a few hertz apart. The pulse you hear is the difference between them — it is not in either tone on its own, and on speakers there is no pulse at all. Put headphones on, press play, and you can hear whether this works before you read a word of this page.
Nothing here is uploaded and nothing is stored. The file is made on your device by two oscillators and handed straight back to you, which is why it is free, why there is no account, and why it costs us nothing per play.
- Free
- No account
- Nothing uploaded
- 16-bit stereo WAV
Three steps, about a minute
- Put headphones onStereo, at low volume. On speakers, switch to isochronic.
- Pick a starting pointChoose a setting, press play, and adjust while you listen.
- Download the WAVRendered on this device and handed straight back to you.
Elapsed 0:00
- Left
- 195.0 Hz
- Difference
- 10.0 Hz
- Right
- 205.0 Hz
What you are hearing
Two traces, one per ear, and the difference between them underneath. The traces are nearly identical and very slightly out of step — that gap is the whole mechanism, drawn rather than described.
Fine-tune
Beat frequencyHow fast the pulse is. The number you hear as a pulse is the difference between your two ears, and this is that difference.
10.0 HzThe bands an EEG uses, with a marker where your beat sits. Both ends of every band are ordinary settings; there is no best one here.
CarrierThe pitch underneath the pulse. It is the part you hear as a tone, and it changes nothing about the beat — a matter of taste, like choosing a bed.
200 HzModeBinaural is two tones, one per ear. Isochronic is one tone pulsed on and off, which works on speakers and is much easier to hear. Two tones, one per ear. Needs stereo headphones; on speakers the two tones mix in the air and you get an ordinary slow wobble instead. One tone switched on and off at the pulse rate. Louder and more obvious, and it works without headphones.
How longHow long the file runs. Most people use fifteen to thirty minutes.
Get the track
Made in your browser. Nothing is uploaded, and the file is never stored anywhere.
A stereo WAV file at 44.1 kHz, generated here in a few seconds and handed to you as a download. It is two channels and it stays two channels — that is what the beat is made of.
How this works
A binaural beat is two sine tones. One plays in your left ear and one in your right, and the two frequencies differ by a few hertz — that difference is the beat. Neither tone wavers on its own: each one is perfectly steady, and the pulse appears only because your brain is hearing them together.
That is also why headphones are not a suggestion. Two speakers in a room send both tones to both ears through the air, where they mix into one wobbling tone before they reach you. Summed to a single channel the beat is genuinely gone, not quiet — there is nothing to hear and nothing happening.
The carrier is the pitch underneath the pulse. It is 200 Hz on every preset here, because it is a matter of taste rather than a variable anyone needs from a starting point, and you can change it beside the beat if you want to. Below about 200 Hz you feel it more than hear it; above about 600 Hz gets tiring over a long session.
Isochronic is the other common way round. Instead of two tones, it is one tone switched on and off at the pulse rate, so the beat is written into the waveform rather than produced by your ears. It is louder, far more obvious, and it works without headphones — which makes it the better mode on a phone, on a laptop speaker, or anywhere else you are not wearing cans.
How to play it
On stereo headphones, at low volume, for fifteen to thirty minutes. Not through the night in earbuds — a track that becomes an irritation by the third hour is worse than no track at all.
Any player that opens a WAV will do it. Nothing here is encoded, nothing is locked, and nothing about the file stops you opening it in whatever you like.
Subliminal audio creatorThe other half of this: your own statements, in your own voice, recorded and assembled into a finished pack. A different format doing a different job — that one needs an account, because it renders on a server.