I would learn a command line tool that does what the web GUI does. I think ImageMagick can do what you want if you take the time to read the documentation. (B

I would learn a command line tool that does what the web GUI does. I think ImageMagick can do what you want if you take the time to read the documentation. (Better yet, also learn to generate an aPNG, which is a much better standard.) Any time you can do something local, you skip the question of what... tracking stuff... is littering the website you're using. (Similar logic goes for things like... hashes. Keep it offline, at all costs, or we might notice.)