If you, like me, are getting eye strain due to the bright colors in PDFs (especially those given for college study material), this tool might be for you. I tried searching Google for a similar tool ...

Craig Mod, a deep thinker about books, queried on Twitter about a way to invert black-on-white text to white-on-black in a PDF. There are a few ways to carry this out. iOS Accessibility lets you set a ...