How This Works
Images found in the may contain hidden text messages encoded in the least-significant bit (LSB) of the red color channel. Each pixel's red value ends in either a 0 or a 1 and that bit is the message.
This tool reads those bits in row-major order (left to right, top to bottom) and reconstructs the original text.
NOTE: Only PNG/lossless images will work. JPEG compression destroys the hidden bits. If you're trying to decode a JPEG, find the PNG version.