C#/VB.NET: Convert Office (Word, Excel, PowerPoint) Files to OpenDocument Format (ODT, ODS, ODP)

What is OpenDocument Format

OpenDocument Format (ODF) is an open and ISO-standard file format for office application files such as word processing documents, spreadsheets and presentations. OpenDocument format has several advantages, for example, it is compatible with MS Office and open-source applications like OpenOffice and LibreOffice, it is platform-independent and does not rely on any office application suite, and it is an open standard that can be implemented by any company in its software.

OpenDocument files can have the following extensions:

• .odt (word processing documents)
• .ods (spreadsheets)
• .odp (presentations)

This article will introduce how to convert Office (Word, Excel, PowerPoint) files to OpenDocument Format (.odt, .ods, .odp) using C# and VB.NET. It includes the following topics:

• Convert Word Files to OpenDocument Text (.odt)
• Convert Excel Files to OpenDocument Spreadsheet (.ods)
• Convert PowerPoint Files to OpenDocument Presentation (.odp)

.NET Library to Convert Office Files to OpenDocument Format

In order to convert Office files to ODF, this article uses Spire.Office for .NET library. You can install Spire.Office for .NET via NuGet by selecting Tools > NuGet Package Manager > Package Manager Console, and then executing the following command:

PM> Install-Package Spire.Office

Alternatively, you can also download the DLL files of Spire.Office for .NET from the official website, extract the package and then add the DLL files under the Bin folder to your project as references.

Convert Word Files to OpenDocument Text (.odt) in C# and VB.NET

The following steps demonstrate how to convert a Word file to OpenDocument Text (.odt) format:

• Initialize an instance of the Document class.
• Load a Word file using Document.LoadFromFile(string) method.
• Save the file to OpenDocument Text (.odt) format using Document.SaveToFile(string, FileFormat) method.

C#

using Spire.Doc;

namespace ConvertWordFilesToODT
{
    class Program
    {
        static void Main(string[] args)
        {
            //Initialize an instance of the Document class
            Document document = new Document();
            //Load a Word file
            document.LoadFromFile(@"C:\Users\Administrator\Desktop\Test.docx");

            //Save the Word file to OpenDocument Text (.odt) format
            document.SaveToFile("WordToOdt.odt", Spire.Doc.FileFormat.Odt);
        }
    }
}

VB.NET

Imports Spire.Doc

Namespace ConvertWordFilesToODT
    Friend Class Program
        Private Shared Sub Main(ByVal args As String())
            'Initialize an instance of the Document class
            Dim document As Document = New Document()
            'Load a Word file
            document.LoadFromFile("C:\Users\Administrator\Desktop\Test.docx")

            'Save the Word file to OpenDocument Text (.odt) format
            document.SaveToFile("WordToOdt.odt", Spire.Doc.FileFormat.Odt)
        End Sub
    End Class
End Namespace

Convert Excel Files to OpenDocument Spreadsheet (.ods) in C# and VB.NET

The following steps demonstrate how to convert an Excel file to OpenDocument Spreadsheet (.ods) format:

• Initialize an instance of the Workbook class.
• Load an Excel file using Workbook.LoadFromFile(string) method.
• Save the file to OpenDocument Spreadsheet (.ods) format using Workbook.SaveToFile(string, FileFormat) method.

C#

using Spire.Xls;

namespace ConvertExcelFilesToODS
{
    class Program
    {
        static void Main(string[] args)
        {
            //Initialize an instance of the Workbook class
            Workbook workbook = new Workbook();
            //Load an Excel file
            workbook.LoadFromFile(@"C:\Users\Administrator\Desktop\Test.xlsx");

            //Save the Excel file to OpenDocument Spreadsheet (.ods) format
            workbook.SaveToFile("ExcelToOds.ods", Spire.Xls.FileFormat.ODS);
        }
    }
}

VB.NET

Imports Spire.Xls

Namespace ConvertExcelFilesToODS
    Friend Class Program
        Private Shared Sub Main(ByVal args As String())
            'Initialize an instance of the Workbook class
            Dim workbook As Workbook = New Workbook()
            'Load an Excel file
            workbook.LoadFromFile("C:\Users\Administrator\Desktop\Test.xlsx")

            'Save the Excel file to OpenDocument Spreadsheet (.ods) format
            workbook.SaveToFile("ExcelToOds.ods", Spire.Xls.FileFormat.ODS)
        End Sub
    End Class
End Namespace

Convert PowerPoint Files to OpenDocument Presentation (.odp) in C# and VB.NET

The following steps demonstrate how to convert a PowerPoint file to OpenDocument Presentation (.odp) format:

• Initialize an instance of the Presentation class.
• Load a PowerPoint file using Presentation.LoadFromFile(string) method.
• Save the file to OpenDocument Presentation (.odp) format using Presentation.SaveToFile(string, FileFormat) method.

C#

using Spire.Presentation;

namespace ConvertPowerPointFilesToODP
{
    class Program
    {
        static void Main(string[] args)
        {
            //Initialize an instance of the Presentation class
            Presentation presentation = new Presentation();
            //Load a PowerPoint file
            presentation.LoadFromFile(@"C:\Users\Administrator\Desktop\Test.pptx");

            //Save the PowerPoint file to OpenDocument Presentation (.odp) format
            presentation.SaveToFile("PowerPointToOdp.odp", Spire.Presentation.FileFormat.ODP);
        }
    }
}

VB.NET

Imports Spire.Presentation

Namespace ConvertPowerPointFilesToODP
    Friend Class Program
        Private Shared Sub Main(ByVal args As String())
            'Initialize an instance of the Presentation class
            Dim presentation As Presentation = New Presentation()
            'Load a PowerPoint file
            presentation.LoadFromFile("C:\Users\Administrator\Desktop\Test.pptx")

            'Save the PowerPoint file to OpenDocument Presentation (.odp) format
            presentation.SaveToFile("PowerPointToOdp.odp", Spire.Presentation.FileFormat.ODP)
        End Sub
    End Class
End Namespace

Conclusion

This article demonstrated how to convert Office files to OpenDocument Format (ODF) using Spire.Office for .NET library. Besides the conversion from Office to ODF, you can also use the library to convert Office files to lots of other file formats, such as PDF, HTML, images and many more.