The purpose of this website was to help people to take one long comic strip (think long narrow picture), and split it up into shorter sections that can be used on line webtoon and tapas.
It is all client side and is a progressive web app.
This product uses a web assembly version of ImageMagick and its depenencies. See https://github.com/KnicKnic/WASM-ImageMagick
See https://github.com/KnicKnic/croppy-webtoon for a javascript bookmarklet that allows you to convert the images automatically when uploading for webtoons.