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Open-Source Credits

Last updated: June 2026

FavorPDF is made possible by excellent open-source software. We invoke these tools as independent programs and are grateful to their authors and communities. The list below is an acknowledgement; each project is governed by its own license.

Application frameworks

  • React — User interfaceMIT
  • Next.js — Frontend frameworkMIT
  • next-intl — InternationalizationMIT
  • Tailwind CSS — StylingMIT
  • FastAPI — API frameworkMIT
  • Celery — Background task queueBSD-3-Clause
  • Redis — Task brokerBSD-3-Clause

PDF & document libraries

  • pypdf — Merge, split, rotate, encryptBSD-3-Clause
  • pikepdf — Compress, repair, metadataMPL-2.0
  • pypdfium2 — Render pages to imagesApache-2.0 / BSD-3-Clause
  • pdfplumber — Text & table extractionMIT
  • pdf.js — In-browser PDF previewApache-2.0
  • openpyxl — Write Excel spreadsheetsMIT
  • WeasyPrint — HTML / Markdown → PDFBSD-3-Clause
  • Pillow — Image processingMIT-CMU

Document conversion engines

  • LibreOffice — Office ↔ PDF conversionMPL-2.0 / LGPL-3.0
  • Poppler (pdftohtml) — PDF → HTMLGPL-2.0 / GPL-3.0
  • Tesseract OCR — Text recognitionApache-2.0
  • OCRmyPDF — Searchable-PDF OCRMPL-2.0
  • Ghostscript — PDF rendering for OCRAGPL-3.0
  • qpdf — PDF structure & linearizationApache-2.0

If you believe an attribution is missing or incorrect, please let us know at shencloudtech@gmail.com.