PixelLock

STEP 1 Choose what to lock

Add a message, an image, or both. At least one is required.

Message OPTIONAL

0 characters

Image OPTIONAL · PNG

Drop a PNG here or click to browse

The image is sealed inside the same encrypted file

Remove

STEP 2 Set a passphrase

A long phrase of several unrelated words beats a short, complicated password.

Show

Strength: —

STEP 3 Encrypt

Save the result as a file, or copy it as text you can paste into a chat or email.

Encrypt

Encrypted text

Download file Copy as text

STEP 1 Add the locked content

Open a .pixellock file, or paste encrypted text you were sent.

Drop a .pixellock file here or click to browse

Also accepts files made by earlier versions

Remove

OR

Encrypted text

STEP 2 Enter the passphrase

Show

STEP 3 Decrypt

Decrypt

Message

Copy message

Image

Download image

How it works. Your passphrase is stretched with PBKDF2 (SHA-256, 600,000 iterations, 16-byte random salt) into a 256-bit key. Your message and image are packed into a single envelope and sealed with AES-256-GCM using a fresh 12-byte nonce. GCM is authenticated: a wrong passphrase or a tampered file fails cleanly instead of producing garbage. Everything runs locally through your browser's Web Crypto API — your content and passphrase never leave this page. Keep the passphrase safe; there is no recovery if it's lost.