The PDF format is a great way to save documents with the formatting and text locked in place — but the fact that you can't alter the text doesn't mean you can't alter other things about the document.

A PDF is one of the most useful file formats because it is so universally accessible. No matter what operating system you are using, from Windows to Mac OS, PDF documents should always look the same ...

PDF is the most commonly used document format currently. Adobe launched the format to store all your documents in one file, thus naming it Portable Document Format. Since then, it has been used ...