There are a few ways to make a black background transparent in Gimp. The first way is to use the “Transparency” tool. To use this tool, you need to select the black background and then click on the “Transparency” button. The second way is to use the “Opacity” tool. To use this tool, you need to select the black background and then click on the “Opacity” button. The third way is to use the “Alpha” tool. To use this tool, you need to select the black background and then click on the “Alpha” button.