Open-source components

Stirling PDF is built on these open-source projects. The full source is on GitHub.

Server#

• PDFBox - core PDF reading and editing
• JPDFium - PDFium-based engine for merge, split and reading text and tables
• Tabula - table extraction
• LibreOffice - office document conversion
• qpdf and Ghostscript - PDF optimisation and compression
• OCRmyPDF with Tesseract - text recognition
• Calibre - e-book conversion
• ImageMagick and OpenCV - image processing
• WeasyPrint - HTML to PDF

AI engine#

• FastAPI and Pydantic AI (Python)

Web app#

• React and TypeScript, built with Vite
• EmbedPDF and PDF.js - viewing and annotation
• pdf-lib (Cantoo fork) - PDF editing in the browser
• Mantine - UI components
• i18next - translations for 40+ languages

Desktop app#

• Tauri - native app for Windows, macOS and Linux