Turn any document into Markdown.
Drop a PDF, Word doc, PowerPoint, spreadsheet, or image. Get clean, structured Markdown in seconds — ready for AI tools, RAG pipelines, and Markdown-based workflows.
Drop files here or click to browse
Max 25MB per file · Free: 20/day
Need more? Upgrade to Pro for unlimited conversions + 100MB files.
Trusted by developers and researchers — 50,000+ files converted and counting.
Need to feed social posts into AI tools?
PostToSource turns tweets, threads, Substacks, and public Notion pages into hosted sources for NotebookLM, Claude, and more.
Every format. One tool.
How it works
Upload
Drag and drop any supported file — PDF, DOCX, PPTX, and more.
Convert
Our engine processes your file and extracts clean, structured Markdown.
Download
Copy to clipboard or download as a .md file. Ready for any workflow.
Built for
Developers
Convert docs to Markdown for GitHub, blogs, READMEs, or static site generators.
Researchers
Turn papers and slides into AI-ready text for Claude, ChatGPT, or NotebookLM.
AI Power Users
Feed documents directly into RAG pipelines, vector databases, Claude, ChatGPT, NotebookLM, or Obsidian — in the format they actually want.
Need to feed social posts into AI tools?
PostToSource turns tweets, threads, Substacks, and public Notion pages into hosted sources for NotebookLM, Claude, and more.
Frequently asked questions
Upload any supported file. Our conversion engine processes it and returns clean, structured Markdown. No account needed.
PDF, DOCX, PPTX, XLSX, CSV, JSON, XML, HTML, EPUB, images (JPG, PNG), audio files, and ZIP archives.
Yes — no account needed for the first 20 conversions per day (up to 25MB per file). When you hit your limit, Pro unlocks unlimited conversions, 100MB file support, and batch processing of up to 10 files at once. Upgrade to Pro →
Files are processed in memory and immediately deleted. We never store your documents.
Pro users can batch-convert up to 10 files at once. Free users convert one file at a time.