Hi, sorry about the super late reply. I didn't have internet for the past few months.
Since it's pixelart, I've put them in a PNG atlas, the best way to use them in a game. But you can open it in any image editor, or pixelart editor and re-arrange, or cut them in the way that suits your needs.
The best software for this is aseprite, it has a convenient double click and drag to select a 16x16 cell feature.
Thank you for your generous donation ^^