This is the APP: https://snorpey.github.io/jpg-glitch/

It came from a story at The Verge http://www.theverge.com/2013/9/13/4726098/glitch-art-generator-snorpey-github

And these glitches can be made manually.

https://critiquecollective.com/2014/03/13/tutorial-on-databending-and-glitch-art/