SNOW2 Web Demo

Try it in 30 seconds

Enter a password in Security Settings below.
Type a secret message (e.g. “Meet at 8pm”).
Click Encrypt & Hide — your message is encrypted and hidden inside normal-looking text!
Copy the output or click Download file and send it anywhere (email, notes app, chat).
To read it later: paste or Upload the file into Step 2: Decrypt, enter the same password → your message appears.

Security settings

Password

Pepper / "Signal Key" (optional)

Require pepper to decrypt (authenticated policy)

Advanced: password strength settings (Argon2id)

These control how hard it is to crack your password by guessing. Higher = slower but safer. The defaults are fine for most use. Browsers are limited to lower values than the CLI.

Memory cost in MiB (Argon2 m_cost) Passes / time cost (Argon2 t_cost) Parallel lanes (Argon2 p_cost)

Browser demo uses websafe-zw mode (zero-width embedding). Some platforms may strip zero-width characters. For strongest reliability, use the CLI with file-based carriers.

Step 1: Encrypt & Hide

Your secret message Cover text (your message will be hidden inside this)

Output — looks normal, but your encrypted message is hidden inside

Step 2: Decrypt & Reveal

Paste or upload the text containing a hidden message, enter the same password (and pepper, if used), then click Decrypt.

Password

Pepper / "Signal Key" (optional)

Paste text containing a hidden message

Your decrypted message

Raw data (base64)

Tribute

SNOW2 is inspired by Matthew Kwan’s original SNOW — a clever, educational demo of whitespace steganography + encryption. This web demo is for learning and testing. Don’t treat browsers as a security boundary.