Picrypter is an encryption tool for 24-bit image files. This program uses the unique keys to encode/decode pictures. To make a picture hidden, Picrypter encode every single pixel of an image. In fact, it changes the color of them. The result is the indecipherable dump of pixels. So, the encoded file is still an image file and can be viewed in any picture viewer or editor. After decoding, the picture gets back without any distortion.
The only disadvantage is that the encoded image can be saved only as a bitmap file. It cannot be compressed as JPEG or other picture compression format, because after compression the pixels' colors are some changed and thus cannot be decoded without distortion.
This software is a commercial software. You will be able to download and test Picrypter during a certain period of time, then, if it does what you need, you will have to acquire the full version from Picrypter publisher. The Picrypter 1.1 Demo free trial version contains an installer and an uninstaller, and has a size of 537 Kilobytes.
For additional information and support request, please contact directly Picrypter publisher.

Picrypter Screenshot