FF6Tools - Browser-Based ROM Editor

This is the best map editor so far even tho the browser version is missing a lot of features. My only problem is not being able to read modified ROMs, specially since it use a web browser which I tend to close by accident once in a while (and lose all progress as a result).

I was able to make an IPS file with map changes and apply the patch to a FF3usME edited ROM, it works but the WoR map gets corrupted so I'd make sure FF6Tools works with ROMs modified by FF3usME too.

Also the editor seems to move a lot of data...over 200k even when I haven't done much, why is that? This also results in patches that fix map bugs (even maps that I haven't touched with FF6Tool) to not work anymore.

Thanks for the feedback. I just made it so that if you open a non-vanilla ROM, FF6Tools will give you a list of built-in definition files to choose from. This should allow you to load ROMs which have been modified by FF3usME or other editors. Also, if you previously saved using FF6Tools, you should have gotten a zip file with two files inside. One is the modified ROM, and the other is a json file that you can use to re-open the modified ROM in FF6Tools.

I'm thinking about adding a warning message in case you accidentally close the window or hit the back button. Just gotta figure out how to do that.

I'm not sure about the issue with the WoR map. I'll test that out myself and see if I can recreate the problem. Now that I think about it, I don't think I've tested WoR or Serpent Trench at all!

I expect that the reason why you are seeing large patch sizes is that FF6Tools re-calculates pointer tables to optimize data storage. So for example, if you edit a map and the data length changes by a few bytes after re-compression, all of the data for the following maps will shift over by a few bytes. The IPS and UPS formats have no way of handling this, so they treat it as though the entire thing is a new block of data. If you need a smaller patch file size, you could try a different format like xdelta or bsdiff which are a bit more optimized for this type of thing. I have tentative plans to incorporate a multi-format patch generator and patcher directly into FF6Tools, but this is probably a long way off.

Patches that fix map bugs only work if the map data is in its original location in the ROM, so they would need to be applied before editing any maps with FF6Tools. Or you would need to make the fixes manually using FF6Tools.

---

On a side note, I added support for the Japanese and European versions of FF6 Advance, including multi-language text boxes for strings. Apparently strings are stored separately for the small and large fonts that the game uses. This is also true for the Japanese version of FF6 Advance, which has separate strings for "with Kanji" and "without Kanji". So you need to edit all duplicates of these strings in order for your changes to show up everywhere in the game.

I also added support for the original Final Fantasy for the NES. Here are some screenshots:

Map Editor: Screenshot 1  Screenshot 2
Battle Editor: Screenshot 3  Screenshot 4