Portable document format (PDF) files remain a popular choice for business documents ranging from contracts and forms to manuals and reports, so there's a good chance you need to open them often.

There are times when Acrobat Reader DC fails to open a PDF file and displays the following error message: Adobe Acrobat Reader could not open PDF because it is either ...

To use SumatraPDF, visit the official homepage and click 'Download' at the top of the screen. Click the installer that matches your environment. This time, select the 64-bit version ...

Editor’s Note: This article was originally published in Mar. 2014 and the video tutorial for this article published Dec. 2018; while this program might look a little different, the steps shown in this ...

Ever tried to open two PDFs side-by-side in Preview? The app normally only lets you open a single copy of a document, so if you want to keep open a second copy—say, for easier footnote retrieval, or ...