Markitdown Online is a web-based file converter that transforms PDF, DOCX, XLSX, PPTX, HTML, images, CSV, JSON, and more into clean, structured Markdown optimized for AI workflows. It is powered by Microsoft's open-source MarkItDown library and runs server-side with no Python installation or account required to start. The tool supports high-accuracy OCR for scanned documents and image-embedded files, making it suitable for RAG pipelines, LLM prompts, vector databases, and knowledge bases. Free users can convert up to three files at a time, while Pro users unlock batch processing, larger file sizes, and saved results.