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.

Free software on your phone or tablet lets you scan, create, edit, annotate and even sign digitized documents on the go.

Why pay for Adobe Acrobat or risk your data with online editors when excellent open-source PDF tools offer powerful, private alternatives? These PDF editors give you complete control over your ...

To change the default PDF viewer on Windows 10, you'll need to edit your default apps in the Control Panel.