Stirling PDF is a free, private, and open-source PDF editing and document processing platform designed to run on any infrastructure.

The main features and capabilities of Stirling PDF include:

• Privacy-First & Self-Hosted Architecture: Runs directly on your own machine or server, ensuring sensitive files remain secure and offline without landing on third-party websites.

• 60+ PDF Editing Tools: Provides a broad suite of tools for reading, editing, converting, merging, splitting, compressing, and validating PDF documents.

• AI Assistant for Natural Language Edits: Features an interactive assistant that performs in-place document modifications—such as redacting PII, translating, summarizing, and converting—using plain language commands.

• Automated Batch Pipelines: Enables creating automated processing pipelines to OCR scan, classify, redact, compress, and route thousands of PDFs at once to destinations like SharePoint.

• Programmatic APIs & MCP Support: Exposes every PDF operation via REST APIs and Model Context Protocol (MCP) to seamlessly integrate document processing into custom software and AI workflows.

• Policy Enforcement & Action Logging: Provides full audit logging and applies organizational rules automatically the moment a file arrives.