A simpler way to move documents into Markdown.

Markdown is easy to edit, review, version, and publish. Getting existing content into Markdown is the awkward part, especially when it starts in a PDF, Word document, or spreadsheet. TheMarkdowner handles that step and shows you the result before you download it.

Local file processing is the core idea. Your browser reads the file and performs the conversion on your device. Private drafts, research notes, client material, and internal documentation never enter a remote conversion queue. There is no account, paywall, or daily quota.

What matters here

• Privacy: documents stay in the browser during conversion.
• Reviewability: Markdown output appears beside a preview before download.
• Practical formats: common document, data, and archive types share one workflow.
• Honest output: warnings call out skipped images, scanned PDFs, and complex formatting.

The project is intentionally focused. Pick a file, see what the converter produced, fix anything that needs attention, and save the result.

Open source software and credits

TheMarkdowner relies on open source libraries that make local conversion and preview possible:

• Mermaid: Used to render diagrams locally (MIT License).
• Marked: Powering our real-time Markdown preview editor (MIT License).
• PDF.js: Used for extracting text layers from PDF files in the browser (Apache License 2.0).
• Mammoth.js: Used to translate Word DOCX elements into semantic structures (BSD 2-Clause License).
• Turndown: Converting parsed HTML nodes back into clean Markdown formatting (MIT License).