Table to Markdown

Convert between CSV/Excel and Markdown tables

Upload .xlsx / .csv

Paste CSV / Table Data

AI AgentStructured Prompt

Use Table to Markdown in AI

Copy the schema, SOP, and reference script directly into your agent workflow.

1. Function Schema

Import directly into Dify, Coze, Cursor, or any tool-calling agent runtime.

Function Schema

{
  "name": "table_markdown_convert",
  "description": "Convert CSV-like rows to Markdown tables or Markdown tables back to CSV.",
  "parameters": {
    "type": "object",
    "properties": {
      "mode": {
        "type": "string",
        "enum": ["to_markdown", "to_csv"]
      },
      "input": {
        "type": "string",
        "description": "CSV text or Markdown table text."
      }
    },
    "required": ["mode", "input"]
  }
}

2. System Prompt / SOP

Paste this into your system prompt to keep the generated tool implementation aligned with the contract.

System Prompt SOP

# Task Constraints: Table Markdown Converter

When converting tabular text, you MUST preserve row and column alignment.

## Core Prohibitions
- NEVER guess missing delimiters and fabricate cells without saying so.
- NEVER drop empty cells at the end of rows.
- NEVER reorder columns during conversion.

## Standard Implementation
1. Parse the input into a 2D table representation.
2. For to_markdown, render a Markdown header row, separator row, and body rows.
3. For to_csv, serialize every row back into comma-separated text with proper escaping.
4. Return a validation error if parsing fails.

## Guardrails
- Keep line order stable.
- Preserve blank values as empty cells.
- If the input contains inconsistent row widths, either normalize explicitly or fail with a clear error.

3. Core Script

This keeps the AI contract intentionally text-only. File upload parsing can stay in the UI while the agent tool handles deterministic table-string conversion.

Core Script

function main(args) {
  const { mode, input } = args;

  if (!input) {
    return { success: false, result: "", error: "input is required" };
  }

  try {
    if (mode === "to_markdown") {
      return { success: true, result: csvToMarkdown(input) };
    }

    if (mode === "to_csv") {
      return { success: true, result: markdownToCsv(input) };
    }

    return { success: false, result: "", error: "Unknown mode" };
  } catch (error) {
    return {
      success: false,
      result: "",
      error: "Conversion failed: " + (error instanceof Error ? error.message : String(error)),
    };
  }
}

Full documentation at /table-markdown/ai

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About Table to Markdown

Online table converter that transforms Excel, CSV, and tabular data into Markdown tables. No signup, no download required — paste your data and get instant results. Used by developers, writers, and documentation authors who need to convert spreadsheets and CSV files into Markdown format for GitHub READMEs, Notion docs, or blog posts.

How to Use

Paste your CSV data or upload an .xlsx / .csv file using the upload button.
Click the Convert button to generate the Markdown table.
Preview the rendered table below, then copy or download as Markdown, CSV, or Excel.

FAQ

Is my data stored on your server?

No. All conversion happens entirely in your browser. Your data never leaves your device.

What file formats are supported?

Input: CSV text, .xlsx, .xls, .csv files. Output: Markdown table, CSV file, Excel file.

Is there a file size limit?

Since processing runs in your browser, very large files (>10MB) may slow down your browser. For typical use, there's no practical limit.

Do I need to create an account?

No account or signup is required. Just open the page and start converting.

Can I convert Markdown back to Excel?

Yes! Switch to the To CSV/Excel mode, paste your Markdown table, and download as .xlsx.