With LockImage you protect an image by converting it into a password protected executable with an embedded viewer. It consists of exactly one file and does not need any installation.
It consists of just one file and doesn’t need to be installed. Lockimage will convert any picture into a “password protected executable,” which means the file will open on any PC without the Lockimage program. This means, however, the modified file is no longer considered an image file, so this may not be the right solution for some.
Download Lockimage from here