[Img] jsteg

LSB (least-significant bits)

accomplished by copying each bit of the data into the least-significant bits (LSB) of the image / file.

jsteg hide <in.jpg> <secret file name> <out.jpg>

jsteg reveal <in.jpg> <output file name>

https://wiki.bi0s.in/steganography/zsteg/
Zsteg is also a tool like Jsteg but it is used to detect LSB steganography only in the case of PNG and BMP images.

zsteg <filename>