Stash - Version 1.0 Hide data files inside image files. Start with an image file, add a data file and get an image file that is essentially visually identical to the original. Stash supports 5 different methods of hiding and retirieving (of course) data in an image. There is no way to determine, by visually examining the output images that Stash creates, that there is non-image data stored in them. BMP, PCX, PNG, GIF and TIFF formats are supported.