About MDTool
Free, client-side conversion tools for Markdown, PDF, HTML, and Word.
What MDTool is
MDTool is a small set of single-purpose conversion tools: Markdown to PDF, Markdown to HTML, Markdown to Word, HTML to Markdown, and Word to Markdown. There is no account system, no saved-document history, and no paywall — every tool is free to use without limits.
How conversion actually works
Every conversion runs entirely in your browser using JavaScript. When you paste text or upload a file, it is parsed and rendered locally on your device — it is never transmitted to an MDTool server. You can verify this yourself: open your browser's Network tab while converting and you'll see no outbound request carrying your document content.
This is possible because each tool is built on well-established open-source libraries:
- marked — Markdown parsing
- highlight.js — syntax highlighting for code blocks
- mermaid — diagram rendering
- html2pdf.js — in-browser HTML-to-PDF generation
- docx — generating Word (.docx) files
- mammoth — reading Word (.docx) files
- turndown — HTML-to-Markdown conversion
None of these libraries require a server round-trip to do their job, which is why MDTool doesn't have one for the conversion step itself.
How MDTool is funded
MDTool is supported by non-intrusive display advertising rather than subscriptions or paid tiers. See the Privacy Policy for details on what that involves.
Questions or feedback
See the Contact page to get in touch.