Online Image Steganography Tool: Hide & Extract Secret Messages (LSB)

Each pixel in an image consists of Red, Green, and Blue bytes ranging from 0 to 255. Changing the last binary bit of a channel changes its value by at most 1 (e.g., 214 to 215), which is imperceptible to human vision but stores 3 bits of secret data per pixel.

JPEG uses lossy Discrete Cosine Transform (DCT) compression that rounds pixel values and destroys least-significant bits. PNG uses lossless compression, preserving every single RGB bit intact.

Capacity equals (Width × Height × 3) / 8 bytes. For example, a 800×600 PNG contains 480,000 pixels and can store up to 180 KB of raw text.

Cryptography hides the meaning of a message, while steganography hides the existence of the message. Combining passphrase scrambling with LSB steganography provides both layers.

Never. All pixel array manipulation runs locally inside your browser's HTML5 Canvas.