[pastage]

I have Cyberchef locally, just unzip it and run. It has an auto function that I only manage to get working by mistake. So as is said in another comment just learn that instead. (Though I really support your need to scratch an itch, I think you need spacing on the edges of the screen for mobile.)

Here is a diff example: https://gchq.github.io/CyberChef/#recipe=Diff('%5C%5Cn%5C%5C...