PDF File Extension

Have a problem opening a .PDF file? We collect information about file formats and can explain what PDF files are. Additionally we recommend software suitable for opening or converting such files.

What is the .PDF file type?

PDF stands for Portable Document Format. This format was developed by Adobe Systems for all sorts of electronic documents. The main idea and advantage of the format is representing documents on different software and hardware configurations in exactly the same way, with the same layout, fonts, colors, illustrations, borders, etc.

PDF files often contain official documents, forms, questionnaires, e-books, letters, user manuals, and other pieces of information that require using text and / or graphics. PDF documents can contain hyperlinks and other interactive elements, making it easier for the user to navigate to different parts of the same document or to learn more on the internet. PDF files can be protected with a password or DRM (digital rights management technology), the latter feature controls how the user can copy, print or otherwise access the protected document.

Software for opening PDF files is typically free for all platforms, while tools that allow editing or creating advanced PDF documents usually require paid registration.

Software to open or convert PDF files

You can open PDF files with the following programs:
Adobe Acrobat Reader DC
Adobe Acrobat Reader DC by Adobe Systems Incorporated
Adobe Reader XI
Adobe Reader XI by Adobe Systems Incorporated
Foxit Reader
Foxit Reader by Foxit Software Inc.

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