1 bit per channel
- Input
- Alteração máxima por canal: 1 em 255
- Expected output
- PSNR tipicamente acima de 50 dB, imperceptível
The most discreet setting, but with the smallest data capacity among the four options.
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how LSB steganography works
LSB (least significant bit) is the most common digital steganography technique for images, because it is simple to implement and explain, yet still effective against casual visual inspection. This page opens the tool in Hide mode with 1 bit per channel selected, the most discreet setting, so you can see the minimal effect first.
The most discreet setting, but with the smallest data capacity among the four options.
Four times the capacity of 1 bit per channel, but the noise can already show to the naked eye on skies, plain walls, or flat backgrounds.
LSB (least significant bit) is the technique of replacing the least important bits of each color byte with bits of your content, a change small enough that the eye usually cannot tell. This tool uses 1 to 4 of those bits in each red, green and blue channel of every pixel (the alpha channel is never touched), preceded by a 14-byte header with the magic number "STG1", a version, the content size and a CRC-32 checksum to validate extraction.
No. Encryption makes a message unreadable without a key, but it is obvious an encrypted message exists; steganography hides the very fact that a message exists at all. The two complement each other: this tool lets you encrypt the content with a password before hiding it, so even someone who discovers the hidden data (with a detection mode, for instance) still cannot read it without the password.
There are statistical hints, such as the pairs-of-values chi-square test (Westfeld and Pfitzmann, 1999), which checks whether the distribution of least significant bits looks artificially equalized, a typical LSB signature. It is a hint, not proof: noisy natural photos can also score low. This tool ships a detection mode that runs that analysis.
Everything happens in your browser: the image, the hidden content and the password never leave your device or pass through a server.