Like the GIF (that's Graphics Interchange Format), the PDF (Portable Document Format) has survived and flourished through the digital age. That's partly because of its versatility: It's the go-to ...

These days, you don't need an app just to view PDF files. Every web browser can do that. If you sometimes create PDF files out of Office documents, you probably use Adobe's Acrobat Reader. After all, ...

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 ...