Open-Source Licenses

Last updated: 13 August 2026

MarkPrep is built on open source. The in-browser conversion that powers the product would not be possible without the work of the maintainers below. We are grateful to them. Each library is listed with its license and a one-line description of its role.

• pdf.js (Apache 2.0) — PDF text extraction & rendering
• Tesseract.js (Apache 2.0) — Local OCR
• mammoth.js (BSD) — DOCX to HTML
• SheetJS/xlsx (Apache 2.0) — Spreadsheets
• Turndown (MIT) — HTML to Markdown
• turndown-plugin-gfm (MIT) — GFM tables
• PapaParse (MIT) — CSV parsing
• JSZip (MIT) — EPUB/PPTX unzip
• gpt-tokenizer (MIT) — Exact OpenAI token counts
• marked (MIT) — Markdown preview
• DOMPurify (Apache 2.0 / MPL) — HTML sanitisation
• Next.js (MIT) — Application framework
• React (MIT) — User interface library
• Tailwind CSS (MIT) — Styling

Each library remains subject to its own license. Trademarks and copyrights belong to their respective owners.