mdstill

mdstill is a document preprocessor purpose-built for LLM and RAG workflows. Drop a PDF, Word, Excel, PowerPoint, EPUB, or any of 18 supported formats and get back clean, structure-preserving Markdown that ChatGPT, Claude, Gemini, and vector-database pipelines can actually use. Key features: • 18 input formats: PDF, DOCX, PPTX, XLSX, EPUB, HTML, CSV, JSON, RTF, ODT, Apple iWork (Pages, Numbers, Keynote) and more • GitHub-flavored Markdown output — tables preserved, headings become linkable anchors, lists and code blocks survive intact • ~5-30% more token-efficient than raw text extraction — your LLM costs drop accordingly • REST API for pipeline automation and batch workflows • Free tier with no signup for basic use; registered users get higher daily limits • Privacy-first: files processed in-memory and deleted immediately after conversion — no storage, no logging, no training Built for engineers shipping AI features (RAG ingestion, agent context, embedding pipelines) and for knowledge workers importing legacy archives into Obsidian, Notion, or Logseq. The same engine powers both the zero-install web tool and the developer API. Alternative to: markitdown, Unstructured.io, LlamaParse, Docling, Firecrawl.