What tool can visually analyze LSB steganography in PNG images, and how does it reveal hidden data?

Stegsolve is a Java-based tool for steganalysis. After opening an encrypted image, you can go to Analyse → Data Extract, select the 0th bit of each RGB plane in Bit Planes, and choose LSB First with RGB order. This reveals the encrypted payload's bits visually. Stegsolve also allows XOR comparison between two images to highlight subtle differences caused by LSB embedding.