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.

When somebody sends you a document as an attachment, don't just open it. Use the free tool Dangerzone to scrub it clean of any malevolent code. Here's how it works.

Ubuntu's Gnome-based graphical user interface lets you open and view business documents saved in the PDF format using the Nautilus file manager and a few mouse clicks. Since Ubuntu is a Linux ...

Gimp is normally used to create or manipulate images files, but can also work with PDFs if you understand how it works and what it's limits are. If you’ve never used Gimp—a free image editor available ...

To convert a PDF to Word, you can simply right-click the file and choose Open with Word. You can also open a PDF in Google Docs and download it as a Word file, or ...