MarkPrep

Excel to Markdown

Turn spreadsheets into Markdown tables locally — one clean table per sheet.

Drop files, paste, or click to browse
PDF, Word, Excel, PowerPoint, HTML, CSV, JSON, EPUB, images and more. Nothing is uploaded.
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MarkPrep converts Excel workbooks to Markdown tables with SheetJS, entirely in your browser. Each sheet becomes its own Markdown table under a heading, ready to paste into an LLM or drop into a RAG pipeline. Inner pipes are escaped, columns are padded, and you get a live token count so you know before you paste whether the workbook fits your model.

How to convert excel to markdown

  1. 1Drop your spreadsheet onto the box above, or click to browse. Nothing uploads — the file is read in your browser.
  2. 2MarkPrep converts it to Markdown locally and shows a live token count for your chosen model.
  3. 3Check the Preview, adjust the chunk size, and review the Verify tab for anything worth a second look.
  4. 4Copy the Markdown, download the .md/.zip, or export JSONL chunks for your RAG pipeline.

Format notes & gotchas

  • Formulas are rendered as their computed values, not the formula text.
  • Merged cells flatten to their top-left value.
  • Very wide sheets produce wide tables — consider the chunk view for anything large.

Related converters

CSV to MarkdownPDF to MarkdownWord to MarkdownJSON to Markdown

Frequently asked questions

Does each sheet convert?+

Yes — every sheet in the workbook becomes a separate Markdown table under a `## SheetName` heading.

Is my file uploaded anywhere?+

No. Conversion runs entirely in your browser tab using WebAssembly. There is no upload endpoint — open your browser's Network tab and watch: nothing leaves the page. The only labelled exceptions are fetching a public URL and optional bring-your-own-key OCR.

How much does it cost?+

Conversion and the entire AI-Ready Pack — token counts, chunking, JSONL export — are free and unlimited, because they run on your hardware. Pro ($4/mo) adds workflow features like the local MCP server, watch folders and saved profiles.

Are the token counts accurate?+

Exact for OpenAI models (GPT-4o, o-series) via their published tokenizer. For Claude and Gemini we show a labelled approximation, because those tokenizers aren't public.

Want it inside your workflow?

Conversion is free forever. Pro ($4/mo) adds the local MCP server so Claude Code converts files on your machine, plus watch folders, saved profiles and encrypted sync.

See pricing