That document is damaged and can’t be opened. But you think it’s got versions saved, if only you could get at them. How?
Do you use digital signatures in PDF documents, or do you trust your PDF reader to check them? You could be spoofed into trusting forgeries.
Getting the Find feature right for PDF documents is important. With text find already available, the best solution is distinct from that.
For less than the cost of a year of Adobe Acrobat Pro DC, this is the first choice for anyone who needs more powerful editing tools.
For around half the cost of a year of Adobe Acrobat Pro DC, you can have a superb PDF reader with good general annotation and editing tools.
Can you get malware in PDF? How far can you trust a PDF, or could it be a forgery? How to sign PDFs, and what data may remain hidden inside them.
A simple way to provide a proper Help book for your app, and separate PDF documentation without wasted effort. Uses Swift in Xcode.
Why don’t some PDFs display properly outside Adobe software? Will PDFs ever become more accessible? And what to do when they get damaged?
A close look at just what macOS PDF support and Preview can do well, including a hidden file conversion feature.
By popular request, how to customise the PDF reader’s interface to enlarge the window and show larger thumbnails. With two lines of code.
The Eclectic Light Company 