FF4Tools is a set of utilities intended to help in hacking FF4. Written in Javascript, these tools are intended to be used alongside a hex editor. All of the tools load the default hex data and convert it for you as you edit. You can then paste it back into the ROM with a hex editor. Instructions are included within each tool; push the "?" button in the top-left corner to display them. Current release notes can be found here.

Screenshots

Demo