How to convert HTML file to Excel in C#.NET

EasyXLS Excel library can be used to convert Excel files in C#. The library works with .NET Framework or .NET Core platform.

Step 1: Download EasyXLS Excel Library for .NET

To download the trial version of EasyXLS Excel Library, press the below button:

Download EasyXLS™ Excel Library for C#

If you already own a license key, you may login and download EasyXLS from your account.

Install the downloaded EasyXLS installer for v8.6 or earlier.

Step 2: License file setup

Step required for EasyXLS v9.0 or later.

If you are using a trial, generate a trial license file from EasyXLS trials page. The trial license is valid for 30-days.

If you own a license key, you may login to the account that purchased the license and generate the license file from:

Setup the license file into your project using these guidelines.

Step 3: Create a C# project

If don't have a project, create one as ASP.NET web application, windows forms app, console application, class library or service.

Step 4: Include EasyXLS library into project

EasyXLS.dll must be added as reference to your project. EasyXLS.dll can be found:
- Inside the downloaded archive at Step 1 for EasyXLS v9.0 or later
- Under installation path for EasyXLS v8.6 or earlier, in "Dot NET version" folder.

Add EasyXLS reference

Step 5: Run C# code that converts HTML file to Excel

Execute the following C# code that converts HTML file to Excel.

/* ---------------------------------------------------------------------
 * Tutorial 40
 * This tutorial shows how to convert HTML file to Excel in C#. The
 * HTML file generated by Tutorial 31 is imported, some data is modified
 * and after that is exported as Excel file.
 * --------------------------------------------------------------------- */

using System;
using System.IO;
using System.Data;
using EasyXLS;

public class Tutorial40
    static void Main()
        Console.WriteLine("Tutorial 40\n-----------\n");

        // Create an instance of the class used to import/export Excel files
        ExcelDocument workbook = new ExcelDocument();

        // Import HTML file
        Console.WriteLine("Reading file C:\\Samples\\Tutorial31.html");

        if (workbook.easy_LoadHTMLFile("C:\\Samples\\Tutorial31.html"))
            // Set worksheet name
            workbook.easy_getSheetAt(0).setSheetName("First tab");

            // Add new worksheet and add some data in cells (optional step)
            workbook.easy_addWorksheet("Second tab");
            ExcelTable xlsTable = ((ExcelWorksheet)workbook.easy_getSheetAt(1)).easy_getExcelTable();
            xlsTable.easy_getCell("A1").setValue("Data added by Tutorial40");
            for (int column=0; column<5; column++)
                xlsTable.easy_getCell(1, column).setValue("Data " + (column + 1)); 

            // Export Excel file
            Console.WriteLine("\nWriting file C:\\Samples\\Tutorial40 - convert HTML to Excel.xlsx.");
            workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial40 - convert HTML to Excel.xlsx");

            // Confirm conversion of HTML to Excel
            String sError = workbook.easy_getError();
            if (sError.Equals(""))
                Console.Write("\nFile successfully created.");
                Console.Write("\nError encountered: " + sError);
            Console.WriteLine("\nError reading file C:\\Samples\\Tutorial31.html \n" + workbook.easy_getError());

        Console.WriteLine("\nPress Enter to exit ...");

        // Dispose memory


EasyXLS Excel libraries:

Excel Library for C#
full .NET version to import, export or convert Excel files
Download EasyXLS™ Excel Library for C#

File formats:

Office 365
MS Excel 2021 - 2024
MS Excel 2007 - 2019
MS Excel 97 - 2003