This small tool allows you to hide secret messages in PNG files by encoding them as ancillary chunks. It is based on the excellent pngme book.
$ pngme encode Example.png ruSt "I like reindeer"
I like reindeer
$ pngme decode Example.png ruSt
I like reindeerUsage: pngme <COMMAND>
Commands:
encode Encodes a secret message into the given PNG file
decode Tries to decode a secret message from the given PNG file
remove Tries to removes a secret message from the given PNG file
print Prints given PNG file
help Print this message or the help of the given subcommand(s)
Options:
-h, --help Print help
-V, --version Print version