Audio Secrets

Hide a message or logo inside real sound — type it and get an audio file whose spectrogram literally spells it out, the trick Aphex Twin buried in Windowlicker. Play it, download the WAV, then decode any audio file to reveal what's hidden inside.

Message to hide

Short words stay crisp. Longer messages? Raise the duration below.

Duration5.0s

Lowest pitch500 Hz

Highest pitch7600 Hz

The picture is painted between these two pitches — a wider band means a taller, clearer image but a shriller sound.

Your sound, seen

This is the actual audio below, viewed as frequencies over time.

Drop an audio file to reveal its spectrogram.

How the trick works

Every row of pixels becomes a sine wave at its own pitch; brightness sets its volume. Play all the waves together and the sound carries the picture — invisible to the ear, obvious to the eye in any spectrogram app (Audacity, Spek, or this decoder).

Aphex Twin hid his own face this way in “Windowlicker” back in 1999.