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How to Convert Excel to Markdown and Back in C#

Excel is a powerful tool for data analysis and management, but its proprietary formats (such as XLS and XLSX) often face compatibility issues when shared across platforms. Markdown, as a lightweight markup language, is widely used in technical documentation, README files, and blog posts due to its simplicity and readability. If we could convert data from Excel into Markdown tables embedded in documents, or extract table data from Markdown into Excel for analysis, it would undoubtedly greatly improve work efficiency.

This article introduces how to use Spire.XLS for .NET—a powerful Excel manipulation library—to easily achieve bidirectional conversion between Excel and Markdown in C#.

About Spire.XLS for .NET

Spire.XLS for .NET is a professional Excel .NET API that enables developers to create, read, write, convert, and print Excel files in various .NET applications such as C#, VB.NET, ASP.NET, and .NET Core. Most conveniently, it is completely independent and does not require Microsoft Excel or Office to be installed.

Environment Preparation

The easiest way to install Spire.XLS is via NuGet:

Install-Package Spire.XLS
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1. Excel to Markdown

Converting an Excel file to Markdown format requires very concise core code—just four steps: create a Workbook object, load the Excel file, call the SaveToMarkdown() method to save, and dispose of resources.

using Spire.Xls;

namespace ConvertExcelToMarkdown
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Workbook workbook = new Workbook();
            // Supports loading .xls or .xlsx formats
            workbook.LoadFromFile("input.xlsx");
            // Save as a Markdown file
            workbook.SaveToMarkdown("output.md");
            workbook.Dispose();
        }
    }
}
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The SaveToMarkdown() method converts each non‑empty worksheet in the workbook into a separate Markdown table, and prepends the worksheet name as a heading before each table. With just a few lines of code, you can embed structured data into technical documentation or blog posts.

2. Markdown to Excel

The reverse conversion is equally simple. Spire.XLS provides the LoadFromMarkdown() method, which can directly load a Markdown file and parse it into an Excel workbook structure.

using Spire.Xls;

namespace MarkdownToExcel
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Workbook workbook = new Workbook();
            // Load a Markdown file
            workbook.LoadFromMarkdown("input.md");
            // Optional: fit worksheet content to one page
            workbook.ConverterSetting.SheetFitToPage = true;
            // Export to Excel 2016 format
            workbook.SaveToFile("output.xlsx", ExcelVersion.Version2016);
            workbook.Dispose();
        }
    }
}
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The LoadFromMarkdown() method parses the Markdown content (including text and tables) and converts it into an Excel workbook structure. The SaveToFile() method then exports it as a standard Excel file. This is very useful for scenarios where you need to extract table data from Markdown for further analysis or processing.

3. Advanced Configuration

When converting Excel to Markdown, you can customize export options. For example, you can set whether images are saved using relative paths, whether hyperlinks are formatted as Markdown reference‑style links, and more:

MarkdownOptions options = new MarkdownOptions();
options.SavePicInRelativePath = true;
options.SaveHyperlinkAsRef = true;
workbook.SaveToMarkdown("output.md", options);
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Conclusion

With Spire.XLS for .NET, C# developers can implement bidirectional conversion between Excel and Markdown with minimal code. Whether you need to quickly publish Excel data as technical documentation or extract table data from Markdown into Excel for analysis, this library provides a concise and efficient solution. Its independence from Office installation and support for multiple .NET frameworks make it ideal for integration into various .NET applications.

If you are looking for a lightweight way to bridge the data channel between Excel and Markdown, give Spire.XLS for .NET a try.

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