Binaural Beats Generator

This binaural beats generator builds a finished stereo track in your browser. Pick a beat frequency between 0.5 and 40 Hz from the Delta, Theta, Alpha, Beta and Gamma presets, choose the carrier pitch, and optionally drop in your own MP3, WAV, M4A, OGG or FLAC so the beat rides under your own music, rain recording or guided meditation. Add a pink-noise bed, set fade in and fade out, then download a lossless WAV. Nothing is uploaded: decoding, mixing and encoding all happen on your device.

What a Binaural Beat Actually Is

Play 197 Hz into the left ear and 203 Hz into the right and neither ear hears a 6 Hz sound — 6 Hz is far below the ~20 Hz limit of human hearing. Instead the brainstem compares the two signals and you perceive a slow pulsing at exactly the difference: 6 beats every second. Change the pair to 197 and 207 Hz and the pulse becomes 10 per second. The carrier pitch is what you hear; the difference is what you feel.

The Five Bands and What People Use Them For

The presets follow the classic EEG bands. They are a starting point, not a prescription — pick the one that matches what you want to do, then trust your own ears.

Two Ways to Beat Your Own Music

Most generators only play pure tones. This one can also work on a file you supply, in two different ways:

Why a Frequency Shift, Not a Pitch Shift

This is the part most tools get wrong. A pitch shift multiplies every frequency by the same ratio; a frequency shift adds the same number of hertz to every frequency. Only addition produces one single beat rate across the whole mix.

Because the shift is additive it detunes the music a little, and the amount depends on pitch: 3 Hz is about 24 cents at 220 Hz but under 3 cents at 2 kHz. The tool splits the shift symmetrically — left down by half the beat, right up by half — so the average tuning of the track never moves, and it tells you the detune in cents before you render. Pads, drones, rain and ambience take the treatment beautifully; a solo piano recording at 20 Hz will not.

Choosing the Carrier Frequency

The carrier is the pitch you actually hear. Research on binaural beat perception (Licklider, 1950; Oster, 1973) found the effect is clearest with carriers in the low hundreds of hertz and fades away as the carrier climbs, which is what the sweet-spot meter in the tool reflects.

The beat difference matters too. Below about 30 Hz you hear a pulse; push past that and the two tones start to be heard as two separate rough tones instead. That is why a 40 Hz Gamma beat sounds noticeably different from a 6 Hz Theta beat, and why it works best on a carrier in the 200–300 Hz range.

Binaural, Monaural and Isochronic

Key Features

• Your own audio, not just tones: layer a beat under any MP3, WAV, M4A, OGG or FLAC, or shift the whole mix so the music itself beats.
• True single-sideband shifter: an analytic-signal frequency shifter, not a pitch shifter, so every partial beats at one rate — and the detune is reported in cents before you commit.
• Split carriers: the beat is always centred on your chosen pitch (left − half, right + half), so the average tuning of your music never moves.
• Sweet-spot meter: live feedback on whether your carrier and beat combination will actually be perceived.
• Monaural mode: a speaker-safe version for anyone who cannot wear headphones.
• Animated scope: watch the two tones drift in and out of phase and see the beat envelope they create, slowed down so it stays readable.
• Loop-safe ending: both carriers are nudged by thousandths of a hertz so the file finishes on a whole cycle and repeats without a click.
• Pink-noise bed, fades and looping: turn a 30-second rain clip into a 20-minute session with a gentle fade in and out.
• Private and offline: decoding, shifting, rendering and WAV encoding all run in your browser.

How to Use the Binaural Beats Generator: Step-by-Step

1. Pick a beat frequency: choose a band card such as Theta 6 Hz for meditation or Beta 16 Hz for focus, or drag the beat slider anywhere between 0.5 and 40 Hz. The scope shows the two tones and the beat envelope they create.
2. Add your audio or stay with pure tones: drag an MP3, WAV, M4A, OGG or FLAC file onto the drop zone, or click Skip and generate pure tones only. The file is decoded in your browser and never uploaded.
3. Shape the sound: set the carrier frequency, choose Binaural for headphones or Monaural for speakers, balance the music, beat and pink-noise levels, and set the fade in, fade out and track length.
4. Preview with headphones: put on headphones and press Preview beat to hear the pulse live before rendering. Binaural beats only appear when each ear receives a different tone.
5. Generate and download: click Generate Track, wait for the progress bar, play the result, then click Download WAV to save the finished file.

Tips for a Track You Will Actually Listen To

• Keep the tone layer quiet. Around 25–35% under music is enough; the beat works below conscious attention, and a loud hum is what makes people give up after five minutes.
• Use a long fade in for sleep tracks — 20 to 60 seconds — so nothing jolts you as playback starts.
• For Delta sleep sessions, a 100–200 Hz carrier with a pink-noise bed at 20–30% masks household noise better than tones alone.
• For focus sessions, Beta around 14–18 Hz on a 250–300 Hz carrier stays present without becoming distracting. Instrumental music only; lyrics compete with the task.
• Loop short source clips rather than rendering an hour: tick Loop, set the length you want, and keep the fades at 0 with Loop-safe ending on if you plan to repeat the file endlessly.
• Listen at a comfortable, low volume. Louder does not make entrainment stronger, it just tires your ears.

Safety and Realistic Expectations

Binaural beats are audio, not medicine. At a sensible volume they are harmless for most people, but a few precautions are worth stating plainly: if you have epilepsy or any seizure disorder, check with a doctor before using rhythmic audio; never play an entrainment track while driving or operating machinery, especially Delta and Theta; and stop if you get a headache or feel uneasy. The evidence is genuinely mixed — controlled studies have reported modest effects on anxiety, attention and self-reported relaxation, while the broader claim that the brain synchronises its rhythm to the beat remains debated. Treat a binaural track as a pleasant, structured way to focus or unwind rather than as a treatment.

Frequently Asked Questions

Do binaural beats work without headphones?

No. A binaural beat is created inside your auditory system when each ear receives a slightly different tone, so the two tones must stay separated. On speakers they mix in the air before they reach you and the effect disappears. If you cannot use headphones, switch the Beat delivery option to Monaural: that mode mixes both tones into both channels so the beating happens in the air as a real amplitude pulse, which speakers reproduce fine.

Which beat frequency should I choose?

The presets follow the classic EEG bands. Delta at 0.5 to 4 Hz is used for sleep, Theta at 4 to 8 Hz for deep meditation and creative drifting, Alpha at 8 to 13 Hz for calm relaxation, Beta at 13 to 30 Hz for alert focus and study, and Gamma around 40 Hz for high alertness. Start with the preset, then fine-tune with the slider and keep whatever feels right to you.

What does the carrier frequency do?

The carrier is the pitch you actually hear; the beat is the difference between the left and right carriers. This tool splits the difference, so a 200 Hz carrier with a 6 Hz beat sends 197 Hz to the left ear and 203 Hz to the right. Beats are perceived most clearly with carriers between about 200 and 500 Hz, and they fade out for carriers above roughly 1000 Hz, which is why the sweet-spot meter turns green in that range.

How does the tool add a beat to my own music?

Two ways. Tone layer keeps your music untouched and mixes a binaural tone pair underneath it at the level you choose, which is the safe default. Whole-mix shift instead applies a single-sideband frequency shift to the track itself, moving the left channel down by half the beat and the right channel up by half the beat, so every partial in the music beats at exactly your chosen rate. Whole-mix shift is a frequency shift, not a pitch shift, so it detunes the music slightly; the tool shows you how many cents before you render.

Is my audio uploaded to a server?

No. The file is decoded, processed and encoded entirely in your browser using the Web Audio API and a background worker. Nothing is sent to MiniWebtool, which is why the tool keeps working on large files and even offline once the page has loaded.

Are binaural beats safe and do they actually work?

For most people listening at a comfortable volume they are harmless, but anyone with epilepsy or a seizure disorder should ask a doctor first, and you should never listen while driving or operating machinery. The research is mixed: controlled studies report small effects on anxiety, attention and perceived relaxation, while brainwave entrainment itself remains debated. Treat a binaural track as a relaxation aid, not as medical treatment.