@r000t Also, please add a license header to each nontrivial source file, as just dumping a copy of the GPLv3 into the root doesn't mean anything;
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.

I would go with the AGPLv3-or-later myself for such sort of web thing.


Also, please consider making it work without JavaScript (HTML5 has everything you need to allow people to click to select or drag and drop files without arbitrary code execution).