Let’s start with the basic stuff. How can you view a PDF file? Of course, the first option is to use Adobe Reader. It is the free global standard for reliably viewing, printing, and commenting on PDF documents. Other alternatives are:
PDF Sumatra “is a free PDF, eBook (ePub, Mobi), Comic Book (CBZ and CBR) reader for Windows.”
Foxit Reader is a small, fast, and feature rich PDF viewer which allows you to open, view, annotate (comment on), fill out PDF forms, sign, and print any PDF file.
Evince is the default PDF viewer on the GNOME desktop environment. Okular is a universal document viewer developed by KDE.
Google Drive or your web browser (Modern web browsers like Google Chrome, Firefox, and Safari all have integrated PDF readers).
What are the best PDF editors?
Online PDF editors: Sejda PDF Editor (it lets you edit pre-existing text in the PDF without adding a watermark) and PDFescape.
PDFedit is a free open source pdf editor and a library for manipulating PDF documents, released under terms of GNU GPL version 2. LibreOffice Draw and Inkscape.