If a client emailed you a PDF with a combination of pages in portrait and landscape mode, some pages may display at a 90-degree angle. Adobe Reader lets you rotate the view so you can easily read this ...

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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 ...