With the advent of social media platforms and pervasive free image hosting (for example, Amazon's recent "unlimited photo storage" for Prime members), I would like to take advantage of this to (surreptitiously?) store other types of data. Cursory web searches don't turn up much of anything.
I'm not interested in steganography, per se. Tools like steghide will embed data into JPEG images, sure -- but with very limited storage space inside of a container image.
What I want is a more space-efficient re-encapsulation of raw data into a JPEG file. The resulting image can (and should) look like garbage when rendered in a HTML page. That's fine with me. Obviously, this program should be free-ware/open-source. Additionally, this program should not store payloads within EXIF because such data are often stripped from images hosted on websites.
Ultimately, a browser plugin that could detect the presence of data "packaged" inside of images would be pretty cool.
Before I go out of my way to research and write such software, I want to know: does this tool already exist? Surely someone has already written something like this.