PDF file format has been adopted as a widely used digital document format for publishing contents and sharing over the internet. In its initial days, PDF files were used for desktop publishing of documents such as posters, flyers, and other similar types of files for physical printing. With the passage of time, PDF introduced new standards including PDF/A, PDF/E, PDF/VT, PDF/UA, and PDF/X. These, along with introduction of PDF Reader software, added additional features of being light weight and compatible, resulting in PDF becoming the file standard for fixed documents.