I found an explosion generator on internet, but I'm not sure that I can use it...

Can you share your advice ? Thanks : http://www.explosiongenerator.com/
 (I want to modifie images after generating them)

I think that's ok, it's clearly a generator of sorts and you control the output data, so I think it's fine

I would say it is ok. It has basically the same type of inputs than BFXR which is allowed to make sound effects.

Okay, thanks a lot guys ! :)