The Add Page Numbers feature allows users to add page numbers to PDF documents and set the page number position, starting page number, and custom text. This is useful for users who need to standardize or archive PDF documents. For example, in academic papers, users may need to add page numbers for referencing and indexing; in contract documents, users may need to add page numbers for tracking and auditing. Additionally, this feature can be used to add chapter numbering or headers and footers to PDF documents for better organization and management. By adding page numbers, users can ensure consistent formatting and layout of PDF documents and easily manage and distribute them.