What are binaural beats?

Binaural beats are an auditory illusion. When each ear hears a pure tone at a slightly different frequency, the brain perceives a third, slower pulse equal to the difference between them — for example 200 Hz in one ear and 210 Hz in the other produces a 10 Hz beat.

Why do I need headphones?

The two tones must stay separate until they reach each ear. Over speakers they mix in the air and you hear a single wavering tone instead of a true binaural beat, so stereo headphones are essential.

What do the frequency presets mean?

The presets label the classic EEG bands as a convenience: delta (about 2 Hz), theta (about 6 Hz), alpha (about 10 Hz), beta (about 20 Hz) and gamma (about 40 Hz). They set the beat frequency — the perceived pulse — not the pitch you hear.

Are binaural beats a medical treatment?

No. This is an audio tool, not a medical device, and the presets are labels only. Many people find certain beat frequencies pleasant for focus, relaxation or winding down, but effects vary and it is not a substitute for medical advice.

Is any audio downloaded or streamed?

No. Both tones are synthesised in real time in your browser with the Web Audio API. Nothing is streamed from or uploaded to a server, so it works even offline once the page has loaded.

What is the Binaural Beats Generator?

Free binaural beats generator. Play two pure tones a few hertz apart — one per ear — with adjustable carrier, beat frequency and volume, plus delta, theta, alpha, beta and gamma presets. Synthesised in your browser, nothing streamed. It runs free in your browser on Gera Tools, with nothing uploaded.

Binaural Beats Generator

Name: Binaural Beats Generator
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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Generate custom binaural beats in your browser

This Binaural Beats Generator synthesises two pure sine tones — one in each ear — a few hertz apart. Your brain perceives the difference as a slow pulse, or beat. Everything is generated live in your browser with the Web Audio API, so nothing is streamed or downloaded and it keeps working offline.

Put on stereo headphones (the effect does not work over speakers), pick a preset or dial in your own beat frequency, adjust the carrier tone and volume to a comfortable level, and press Play. All three sliders update the sound in real time.

Understanding the controls

Carrier frequency — the base pitch you actually hear, from 50 to 500 Hz. Lower carriers sound deeper; a value around 150–250 Hz is a comfortable default.
Beat frequency — the difference between the two ears, and the pulse you perceive, from 1 to 40 Hz.
Volume — keep it low; pure tones can feel loud, and quiet listening is kinder to your ears.

The frequency presets

The presets set the beat frequency to the classic EEG bands as a convenience: delta (~2 Hz), theta (~6 Hz), alpha (~10 Hz), beta (~20 Hz) and gamma (~40 Hz). They change the perceived pulse, not the pitch.

This is an audio utility, not a medical device, and the band names are labels only. People use binaural beats for focus, relaxation or winding down; results vary from person to person and it is not a substitute for professional advice.