Document-to-Markdown converter for LLM pipelines – MarkItDown from Microsoft

This Python tool converts dozens of file types to clean Markdown, keeping headings, lists, tables, links, and metadata.

Supports:
- PDF, Word, Excel, PowerPoint
- HTML, CSV, JSON, XML
- Images (OCR + EXIF), audio (transcription + metadata)
- ZIP files, YouTube URLs, EPubs, and more

As Markdown is LLMs' "native language," it's perfect for preprocessing documents before feeding them into models.

https://github.com/microsoft/markitdown


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