Portable Document Format (PDF) is widely used to share documents across various platforms. PDF is popular because it keeps the document's format and layout in such a way that no operating system or PDF viewer shows any signs of modification. PDFs are displayed using software tools called PDF viewers, which have many functionalities for interacting with documents, such as navigation, zooming in and out, and jumping to specific pages.
Each PDF viewer has specific capabilities, which limits the possibilities for new features. Hence, a developer might want to create their own PDF viewer software to cater to their particular needs and preferences, such as document analysis or data extraction. There are many advantages to creating a custom PDF viewer, some of which are given below: