Convert Excel files to HTML

GemBox.Spreadsheet provides C# and VB.NET API for easy conversion between Excel workbooks and HTML pages. The following sections provide example codes for the most common conversion options:

Convert an Excel file to multiple HTML pages

The following example shows how to save an entire Excel workbook, with its sheets and images to HTML, using GemBox.Spreadsheet.

using GemBox.Spreadsheet;

class Program
{
    static void Main()
    {
        // If using the Professional version, put your serial key below.
        SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY");

        var workbook = ExcelFile.Load("%#HtmlExport.xlsx%");
        var worksheet = workbook.Worksheets[0];

        // Set some ExcelPrintOptions properties for HTML export.
        worksheet.PrintOptions.PrintHeadings = true;
        worksheet.PrintOptions.PrintGridlines = true;

        // Specify cell range which should be exported to HTML.
        worksheet.NamedRanges.SetPrintArea(worksheet.Cells.GetSubrange("A1", "J42"));

        var options = new HtmlSaveOptions()
        {
            HtmlType = HtmlType.Html,
            SelectionType = SelectionType.EntireFile
        };

        workbook.Save("HtmlExport.html", options);
    }
}
Imports GemBox.Spreadsheet

Module Program

    Sub Main()

        ' If using the Professional version, put your serial key below.
        SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY")

        Dim workbook = ExcelFile.Load("%#HtmlExport.xlsx%")
        Dim worksheet = workbook.Worksheets(0)

        ' Set some ExcelPrintOptions properties for HTML export.
        worksheet.PrintOptions.PrintHeadings = True
        worksheet.PrintOptions.PrintGridlines = True

        ' Specify cell range which should be exported to HTML.
        worksheet.NamedRanges.SetPrintArea(worksheet.Cells.GetSubrange("A1", "J42"))

        Dim options = New HtmlSaveOptions() With
        {
            .HtmlType = HtmlType.Html,
            .SelectionType = SelectionType.EntireFile
        }

        workbook.Save("HtmlExport.html", options)
    End Sub
End Module

The code above will produce an HTML file and related files directory (for HtmlExport.xlsx the output will contain HtmlExport.html file and HtmlExport_files directory). The HTML file represents the workbook where you can view worksheets by clicking on the desired sheet tab (sheet selector) at the bottom of the page.

Converting Excel file to HTML content in C# and VB.NET
Screenshot of a converted Excel file to HTML pages

GemBox.Spreadsheet also supports properties specified on the workbook level, such as print headings, print gridlines, and print area. You can use the HtmlSaveOptions class to set additional conversion options such as:

  • Choose between HTML and MHTML (MIME HTML) output format.
  • Whether to embed images directly within the HTML file or not.
  • Whether to export the whole workbook or only the selected worksheet.
  • Whether to export a part of the file as an independent HTML table that can be inserted into your HTML page.

Convert Excel sheets to a single HTML page

The example below shows how to use GemBox.Spreadsheet to export all sheets from an Excel file as HTML table elements and combine them into a single HTML page.

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using System.Linq;
using System.Xml;
using GemBox.Spreadsheet;

class Program
{
    static void Main()
    {
        // If using the Professional version, put your serial key below.
        SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY");

        var workbook = ExcelFile.Load("%InputFileName%");

        // Specify exporting of Excel data as an HTML table with embedded images.
        var options = new HtmlSaveOptions()
        {
            EmbedImages = true,
            HtmlType = HtmlType.HtmlTable
        };

        using (var writer = XmlWriter.Create("SingleHtmlExport.html",
            new XmlWriterSettings() { OmitXmlDeclaration = true }))
        {
            writer.WriteStartElement("html");
            writer.WriteStartElement("body");

            // Write Excel sheets to a single HTML file in reverse order.
            foreach (var worksheet in workbook.Worksheets.Reverse())
            {
                if (worksheet.Visibility != SheetVisibility.Visible)
                    continue;

                writer.WriteElementString("h1", worksheet.Name);
                workbook.Worksheets.ActiveWorksheet = worksheet;
                workbook.Save(writer, options);
            }

            writer.WriteEndDocument();
        }
    }
}
Imports System.Linq
Imports System.Xml
Imports GemBox.Spreadsheet

Module Program

    Sub Main()

        ' If using the Professional version, put your serial key below.
        SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY")

        Dim workbook = ExcelFile.Load("%InputFileName%")

        ' Specify exporting of Excel data as an HTML table with embedded images.
        Dim options As New HtmlSaveOptions() With
        {
            .EmbedImages = True,
            .HtmlType = HtmlType.HtmlTable
        }

        Using writer = XmlWriter.Create("SingleHtmlExport.html",
            New XmlWriterSettings() With {.OmitXmlDeclaration = True})

            writer.WriteStartElement("html")
            writer.WriteStartElement("body")

            ' Write Excel sheets to a single HTML file in reverse order.
            For Each worksheet In workbook.Worksheets.Reverse()

                If worksheet.Visibility <> SheetVisibility.Visible Then Continue For

                writer.WriteElementString("h1", worksheet.Name)
                workbook.Worksheets.ActiveWorksheet = worksheet
                workbook.Save(writer, options)

            Next

            writer.WriteEndDocument()
        End Using
    End Sub
End Module
Converting Excel sheets to single HTML content by exporting each sheet as separate HTML table in C# and VB.NET
Screenshot of converted Excel sheets to a HTML page

As an alternative way of converting an entire XLSX to a single HTML, you can use HtmlType.Html. The output MHTML file will include all sheets, images, shapes, textboxes, and charts from the input Excel workbook.

If you want to export the whole Excel file together with images, shapes, textboxes, and charts, into a single HTML page, you can use HtmlType.Mhtml which will export the entire spreadsheet content as a MIME HTML (MHTML) file.

Convert an HTML page to an Excel file

The following example shows how to convert an HTML file to an Excel workbook.

Upload your file (Drag file here)
using GemBox.Spreadsheet;

class Program
{
    static void Main()
    {
        // If using the Professional version, put your serial key below.
        SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY");

        // Load input HTML file.
        var workbook = ExcelFile.Load("%InputFileName%");

        // Save output XLSX file.
        workbook.Save("HtmlImport.xlsx");
    }
}
Imports GemBox.Spreadsheet

Module Program

    Sub Main()

        ' If using the Professional version, put your serial key below.
        SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY")

        ' Load input HTML file.
        Dim workbook = ExcelFile.Load("%InputFileName%")

        ' Save output XLSX file.
        workbook.Save("HtmlImport.xlsx")

    End Sub
End Module
Converting HTML content to Excel sheet in C# and VB.NET
Screenshot of a converted HTML page to Excel file

Apart from converting to an ExcelFile, it's possible to import HTML into a single cell by using the ExcelCell.SetValue(String, HtmlLoadOptions) method.

See also


Next steps

GemBox.Spreadsheet is a .NET component that enables you to read, write, edit, convert, and print spreadsheet files from your .NET applications using one simple API.

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