What is PDF File Extension?
PDF stands for Portable Document Format. It is one of the most widely used file extensions because of its flexibility to open with all operating systems and on the web. It is a multi-platform supported file format which is independent of the basic computing resources including hardware, software, and OS. A PDF file holds varieties of information including text, graph, images, lists etc.
It belongs to the document format.
The most popular format was developed by Adobe Systems.
It supports Adobe Acrobat Reader to create and open. Kindly note that Adobe Systems is patent to PDF but anyone can create the extension without paying to Adobe Systems. Its license is royalty free.
It has several MIME types including
It supports digital signature.
Structure of the File
It is based on COS and PostScript Imaging model.
The tree format of COS includes- Boolean Values, Numbers, Strings, Names, Arrays, Dictionaries, Streams and The Null Object.
How to open or view PDF File Extension
Adobe PDF viewer and any free or paid PDF viewer can help to view a PDF file.