Use the free Binaural Beat Generator below: your data never leaves your browser — all work happens on your device, and nothing is uploaded to any server.
What a binaural beat actually is
A binaural beat is not a sound that exists in the room. It is a sound your brain creates. Here is how it works. A tone of one pitch plays in your left ear, and a tone of a slightly different pitch plays in your right ear. Your brain, trying to make sense of the two tones together, perceives a third rhythm: a slow pulsing equal to the difference between the two pitches. If the left ear hears 200 Hz and the right ear hears 210 Hz, the difference is 10 Hz, and you perceive a beat pulsing ten times per second. That perceived pulse is the binaural beat, and this generator makes it with two precise oscillators, one panned fully left and one fully right.
Headphones are not optional here. They are the whole mechanism. On loudspeakers, both ears hear both tones mixed together, and the effect collapses into an ordinary chord. On headphones, each ear gets exactly one tone, and the brain does the rest. If you try this tool on a phone speaker and hear nothing special, that is expected, not a fault. Put headphones on, press play, and the pulsing rhythm appears within a few seconds.
The five presets, explained honestly
This tool offers five presets named after brainwave bands: delta (2 Hz), theta (6 Hz), alpha (10 Hz), beta (20 Hz), and gamma (40 Hz). These names come from the frequency bands measured in brain activity, and the idea behind the presets is a hypothesis called entrainment: that listening to a rhythmic stimulus can nudge brain activity toward that rhythm. It is important to be honest about the state of the evidence. Some small studies have found effects on relaxation, attention, or mood, but the evidence is mixed, the effects are modest, and no serious researcher would call binaural beats a proven treatment for anything.
That honesty matters, because the internet is full of exaggerated claims about binaural beats: that they cure insomnia or raise intelligence. None of that is established. What is established is simpler: many people find a slow, steady pulsing tone relaxing, like rain sounds. The tone gives the mind something gentle to rest on. If it helps you, use it. If it does not, stop. Treat it as a comfort tool, not as medicine.
How to use the generator
Start with the alpha preset, 10 Hz, which most people describe as calm but alert. Set the carrier tone to 200 Hz, which is a comfortable middle pitch, and set the volume low. A binaural beat should be a background presence, not a loud drone. Listen for a minute and notice the pulse: it is subtle at first, and your ear may need a few seconds to lock onto it. Then try the other presets and compare. Theta, at 6 Hz, feels slower and dreamier to most listeners. Beta, at 20 Hz, feels busier and more alert. Delta, at 2 Hz, pulses so slowly that some people barely notice the pulse at all, and mostly hear a low, steady hum.
You can also set your own numbers. The carrier control moves both tones up or down together: a lower carrier, like 150 Hz, sounds deeper and warmer, while a higher carrier, like 400 Hz, sounds brighter and thinner. The beat control sets the difference between the ears directly: a beat of 4 Hz means the tones differ by 4 Hz, split evenly either side of the carrier, so a 200 Hz carrier with a 4 Hz beat plays 198 Hz in one ear and 202 Hz in the other. The display shows both ear tones exactly, so you always know what you are hearing.
Safety and sensible limits
Binaural beats are ordinary tones at ordinary volumes, and they are safe for most people at low volume. There are still sensible limits. Keep the volume low enough that you could hear someone speaking to you. Do not listen while driving or doing anything that needs full attention to safety, because any relaxing sound can reduce alertness. Do not use this tool as a substitute for medical care: if you have epilepsy, a seizure disorder, or a serious sleep problem, ask a doctor before using rhythmic audio, and do not use it to replace treatment that a doctor has prescribed.
Children and teenagers should use it only at low volume and for short periods, as with any headphone audio. And if you ever feel dizzy, headachy, or uncomfortable while listening, stop immediately. Those reactions are uncommon, but they are a clear signal to take a break. A tool that helps you relax should never be pushed through discomfort.
Why two oscillators, not a recording
Many binaural beat tracks online are recordings with fixed pitches, and they work, but they cannot be adjusted. This generator uses two live oscillators, so every number is exact and changeable: the carrier, the beat, and the resulting left and right tones are computed and displayed in real time. If a recording claims a 10 Hz beat but was made carelessly, you have no way to check. Here, the arithmetic is visible: right ear minus left ear always equals the beat you asked for. That precision is the advantage of generating the sound instead of playing a file, and it is why the tool shows both ear frequencies rather than hiding them.