What Is a PDF Reader?
A PDF reader (also called a PDF viewer) is an application that parses and displays PDF files so you can read, search text, zoom, inspect page thumbnails, rotate pages, and print documents without changing their original layout. You can open any PDF instantly in our free browser PDF Reader with zero software installation and zero file uploads to a server.
PDF Reader vs. PDF Editor
A standard PDF reader focuses on fast, faithful viewing: virtualized page scrolling, keyword search across hundreds of pages, zoom controls, and printing. When you also need to add text boxes, cover sections with whiteout, highlight passages, sign forms, or permanently redact sensitive text, a PDF editor writes new content streams back to a downloadable PDF file.