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Stirling-PDF is a self-hosted document processing suite designed for secure, private file management. It functions as a comprehensive transformation engine that executes complex operations—such as merging, splitting, converting, and redacting documents—directly on the host machine. The platform provides both a browser-based interface for interactive editing and a programmatic, API-first architecture that allows for the automation of document workflows through standard HTTP requests. The project distinguishes itself through its focus on private, infrastructure-agnostic deployment and granular

diff-pdf is a visual comparison tool for PDF files that identifies differences between two documents. It functions as both a command line utility for verifying if documents are visually identical and a visualizer for pinpointing specific changes. The project provides a graphical interface for manual inspection, featuring zoom and offset controls to analyze visual shifts. It also generates difference maps that visually highlight the specific areas where two PDF documents differ. The tool supports automated regression testing by returning status codes to indicate whether pixel-level discrepanc