Spy Picture allows you to add hidden text to an image.

This utility is a neat way to hide whatever type of text you want in an image AKA steganography. It can only be read when by those who you have shared the password for that image with and they will need to have the "Spy Picture" software installed on their computer.

To use Spy Picture, you select an image, input your desired text in, set your password and then the export image. The interface is actually set up with numerical steps to aid you along - not that it is too complex to figure out. Also, you will see multiple hits on Virus Total, this is because the NET assembly is obfuscated.