http://bkg5ofjslnbyqvu55sjonpdyp3wmfsgq23u7vpk3wxn7ewgdeocpgwid.onion?page=article&article=Steghide%3A+A+Beginner%E2%80%99s+Guide+to+Secure+Data+Hiding+in+Plain+Sight.html
Developed with ease of use and strong encryption in mind, it can conceal any type of file (e.g., text, image, or executable) inside another file, referred to as the "cover file." What sets Steghide apart is its ability to hide data in such a way that the resulting file remains largely indistinguishable from the original, both visually and in size.