100% privateYour files never leave the browser

Feel sound move like a breath between your ears.

Bimeural turns the sounds you love into bilateral stimulation: music gently swings between your ears. Upload, tune the pace, listen with headphones and download.

Convert your sound How it works?

0.1–3 Hz: adjustable pace
3 waves: sine · triangle · square
0 servers: fully local processing

◉ LEFTliveRIGHT ◉

night-rain.mp3

bilateral • sine

depth

100% bilateral

export

lossless WAV

Bilateral stimulation100% in-browserMulti-file queueWAV + MP3 outputLive previewNo uploads3 wave characters0.1 – 3.0 HzBilateral stimulation100% in-browserMulti-file queueWAV + MP3 outputLive previewNo uploads3 wave characters0.1 – 3.0 Hz

01 — How it works?

Your own bilateral track in three steps.

No complex audio engineering. An LFO (low-frequency oscillator) sweeps the stereo balance left and right at your chosen pace. The rest is a calm sway inside your headphones.

Upload your sound

Meditation music, nature sounds, a favourite track — MP3, WAV, M4A or FLAC. Queue multiple files at once.

Multi-file

Tune the sway

Pick the sweep rate, pan depth and wave character. Fine-tune with arrow keys, or start in one tap with presets.

Preview live

Export and download

Choose WAV or MP3, process the whole queue in one click and download. Add it to your sleep, focus and relax playlists.

WAV · MP3

02 — Studio

Now it’s your turn. Put your headphones on.

The panel below runs the converter engine — drop your file, preview live, download if you love it.

Bimeural Studio

Bilateral Converter

Ready

Drop audio files here or browse

MP3, WAV, M4A, FLAC — files never leave your device

Choose Files

Everything runs in your browser. Your audio is never uploaded; your privacy is fully protected.

Presets

Sweep rateHow many times per second sound travels between the ears. Low values calm, high values stimulate.

0.1 slow3.0 fast

Pan depthHow far the sway reaches toward the extremes. 100% is full left–right; lower values give a soft background motion.

10% subtle100% full bilateral

With the slider focused, ← → arrow keys adjust by 0.01; click the badge on the right to type an exact value.

BalanceBalances loudness between the left and right ear. If one side dominates, nudge the slider toward the other side; clicking the badge re-centers.

Sweep character

Output format

Settings activate once you add audio — upload a file first.

Headphones required

The effect only works with stereo headphones.

Start quiet

Begin at 30–40% volume, raise slowly.

Private by default

Local processing; no sign-up, no uploads.

03 — Controls

Three knobs, endless calm.

Every control applies instantly to the live preview — turn while listening, stop when it feels right. Presets are a good start; your ears are the best guide.

Sweep rate

0.1 – 3.0 Hz

How fast sound travels between ears. 0.3 Hz feels deeply relaxing, 0.5 Hz is the classic bilateral feel, above 1 Hz gets more stimulating. Focus the slider and use arrow keys for 0.1 steps.

Pan depth

10% – 100%

How far the sway reaches. 100% is full left-to-full right; lower values give a softer motion felt in the background.

Wave character

Sine · Triangle · Square

Sine is silky and round, Triangle is linear and clear, Square jumps sharply. The mini graphs on the buttons show the motion shape.

04 — Questions

Frequently asked questions

What is bilateral sound and what is it for?

Bilateral stimulation is sound rhythmically moving between the left and right ear. Inspired by EMDR therapies, many people use it to relax, focus and wind down before sleep.

Are my files uploaded to a server?

No. Decoding, previewing and exporting all run in your browser via the Web Audio API. No file ever leaves your device.

Which files can I use?

MP3, WAV, M4A/AAC, OGG and FLAC on most devices. Queue multiple files, batch-process them and download as WAV or MP3.

Can I add a YouTube or Spotify link?

No, you can only upload audio files from your device. Download the track as MP3/WAV first, then upload it.

Is this a therapy tool?

No. Bimeural is a sound experience tool; it does not replace psychotherapy, EMDR treatment or medical care. Consult a professional for trauma, anxiety or sleep disorders.

FAQ

Your first bilateral track is a minute away.

No sign-up, no upload, no fee. Just you, your sound and two ears.

Try now — free