visual cryptography

split an image into 2 shares that look like random noise. when you overlay them, the original image appears. works digitally or with physical printed transparencies.

demo: share 1 + share 2 = secret

100% client-side. your images never leave your browser.

split an image

combine shares

how it works

this uses visual cryptography. each pixel in the original image becomes a 2x2 block in each share:

• white pixels: both shares get the same random pattern
• black pixels: shares get opposite patterns

when overlaid, white stays white (patterns align) and black becomes black (patterns fill in). each share alone looks like random noise.

you can print the shares on transparent sheets and physically overlay them. no computer needed to reveal the secret.