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The PDFTron SDK API is divided into multiple namespaces. The most important are the PDF, SDF, and Filters namespaces.
A simple high-level API for manipulating PDF constructs such as pages, interactive forms, bookmarks, graphical elements on the page, and so on.
A powerful low-level API for manipulating every aspect of a PDF document. To use the SDF API, you must be familiar with PDF file structure (documented in the PDF Reference Manual)
A robust utility API that deals with various compression and encryption schemes used in PDF documents. Unless planning to implement a custom encryption or compression scheme in PDF documents, you will only need a very basic knowledge of the filters.
Get the answers you need: Support