I was fascinated with cryptography, encryption and the like ... and ended up reading a lot about steganography. This lead me to searching the web for online tools/websites to sneak in some cat memes into pictures I shot with friends.

Years ago several rudimentary website existed to achieve this (much more nowadays) - still, I ended up creating my own app to do this. Over the years I ended up refactoring and rewriting the whole app multiple times using React (older version) and/or Svelte (this is more recent), both using some WebWorkers to handle the image processing and manipulation.