If I want to convert a string to all caps inside of the browser, I can push F12 and then use the JavaScript console (it is also useful for doing simple calculat

If I want to convert a string to all caps inside of the browser, I can push F12 and then use the JavaScript console (it is also useful for doing simple calculations, and more; really, the web developer console is a feature I use a lot, despite not doing web development stuff). If I want to do so outside of the browser (I don't want to do everything in the browser; the outside stuff is often better), I can use the tr command. If I want to deal with pictures, I always use external programs, such as ImageMagick or my own Farbfeld Utilities (although Farbfeld Utilities cannot currently read animations, so ImageMagick must be used instead). It is possible to download web pages to run them locally, if there is some function you want to do on a web page which is less shady. I don't know which web pages are designed to do that, but you can write some if you want to.