Introduces a new directory containing a small standalone CLI tool () that converts PDFs to Markdown using PyMuPDF and pymupdf4llm. When installed, it replaces the slower pdftohtml-based converter with a significantly faster path. The tool is invoked as an OS subprocess, following the same pattern already used for LibreOffice and Tesseract. A new service handles discovery (PATH probe, cached 30 s), temp file I/O, and process execution via the existing infrastructure. Auto-detected at startup via — no configuration flag required. Falls back transparently to the bundled pdftohtml converter if not found. is baked into the Docker base image via the existing Python venv build stage and symlinked onto PATH, so all Docker users get the faster path automatically with no manual steps. AGPL notice: is licensed under AGPL-3.0-or-later because it depends on PyMuPDF (AGPL-3.0 / Artifex commercial). It is a SEPARATE program from the rest of Stirling PDF and shares no source code with the MIT-licensed core or the proprietary engine. The subprocess boundary ensures the AGPL copyleft attaches to this tool alone and does not extend to Stirling PDF. The LICENSE file and pymupdf-worker/LICENSE document this separation explicitly. Do not replace the subprocess invocation with an in-process import of PyMuPDF.
Stirling PDF - The Open-Source PDF Platform
Stirling PDF is a powerful, open-source PDF editing platform. Run it as a personal desktop app, in the browser, or deploy it on your own servers with a private API. Edit, sign, redact, convert, and automate PDFs without sending documents to external services.
Key Capabilities
- Everywhere you work - Desktop client, browser UI, and self-hosted server with a private API.
- 50+ PDF tools - Edit, merge, split, sign, redact, convert, OCR, compress, and more.
- Automation & workflows - No-code pipelines direct in UI with APIs to process millions of PDFs.
- Enterprise‑grade - SSO, auditing, and flexible on‑prem deployments.
- Developer platform - REST APIs available for nearly all tools to integrate into your existing systems.
- Global UI - Interface available in 40+ languages.
For a full feature list, see the docs: https://docs.stirlingpdf.com
Quick Start
docker run -p 8080:8080 docker.stirlingpdf.com/stirlingtools/stirling-pdf
Then open: http://localhost:8080
For full installation options (including desktop and Kubernetes), see our Documentation Guide.
Resources
Support
- Community Discord
- Bug Reports: Github issues
Contributing
We welcome contributions! Please see CONTRIBUTING.md for guidelines.
This project uses Task as a unified command runner for all build, dev, and test commands. Run task install to get started, or see the Developer Guide for full details.
For adding translations, see the Translation Guide.
License
Stirling PDF is open-core. See LICENSE for details.

