Step-by-step instructions for creating PDFs from any file type, including methods for merging, compressing and password-protecting PDF documents securely.

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 ...

From Adobe Acrobat to free online editors and built-in tools, here’s how to merge multiple PDFs into one document.