How can i delete background of the tool

I had the same problem 

With paint u can't make tools

without background 

you should use Gimp or photoshop 

if you don't have photoshop use Gimp (is free)

Open the textures of your items with gimp and delete the background 

you can also use something like piskel, too, if you want to use it mainly for pixel art

I also had this problem. But I solved it I realized I was taking a screenshot and saving the screenshot as a png resulting in a background. What you should do is directly download it from your software. Then it might work. It depends on your software. I recommend minecraft.novaskin.me/resourcepacks

Did you use paint.net? 

If you use other softwares like paint.net you can select the backround and delete it, this makes it transparent, then draw on that

Or use an auto script to clear that if you know programming

If I'm right MCreator has a built in tool to draw textures, you could just erase the background with that.

If I'm right MCreator has a built in tool to draw textures, you could just erase the background with that.

Oh right, that works too