Convert multiple DOC to DOCX in C#

High-speed .NET library to convert several DOC into DOCX

Use our document merging API to develop high-level, platform independent software for .NET and .NET Core platforms. This is a professional solution to convert multiple DOC into DOCX using C#, F#, VB.NET. Try it online for free!

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Convert DOC to one DOCX in C#

C# library allows .NET developers to convert DOC to DOCX with a few lines of code. DOC conversion engine analyses the original DOC layout and structure, and exports the combined content to DOCX format.

Use C# to convert DOC to DOCX with maximum flexibility and speed. Run online live demo and check the highest DOCX quality right in a browser. DOC Conversion API supports a bunch of useful options.

Merge DOC to DOCX

To convert several DOC to DOCX just use C# library that handles all low-level details.

Convert multiple DOC and save the result as a single DOCX. If you develop code in C#, this will be simpler than it sounds. See C# example that iterates through documents and converts them to DOCX:

Code example in C# to combine multiple DOC to DOCX
Upload a file you want to merge
Run code
Upload a file you want to merge
Select the target format from the list
using Aspose.Words;

var fileNames = new List<string> { "Input1.doc", "Input2.doc" };

var output = new Document();
// Remove all content from the destination document before appending.
output.RemoveAllChildren();

foreach (string fileName in fileNames)
{
    var input = new Document(fileName);
    // Append the source document to the end of the destination document.
    output.AppendDocument(input, ImportFormatMode.KeepSourceFormatting);
}

output.Save("Output.docx");
Run code

How to merge DOC to DOCX C#

  1. Install Aspose.Words for .NET.
  2. Add a library reference (import the library) to your C# project.
  3. Open the source DOC file in C#.
  4. Convert several DOC files into DOCX in a few seconds.
  5. Call the AppendDocument() method, passing an output filename with DOCX extension.
  6. Get the result of conversion DOC into DOCX.

C# library to convert several DOC into DOCX

There are three alternative options to install "Aspose.Words for .NET" onto your system. Please choose one that resembles your needs and follow the step-by-step instructions:

System Requirements

Our product is fully cross-platform and supports all major .NET implementations following '.NET Standard 2.0' specification:

  • Microsoft .NET Framework, starting from the earliest 2.0 version, and ending with the latest '.NET Framework 4.8'
  • .NET Core, starting from the earliest 2.0, and ending with the latest '.NET 6'
  • Mono >= 2.6.7

As far as .NET code doesn't depend on the underlying hardware or operating system, but only on a Virtual Machine, you are free to develop any kind of software for Windows, macOS, Android, iOS and Linux. Just make sure you have installed the corresponding version of .NET Framework, .NET Core, Windows Azure, Mono or Xamarin.

We recommend using Microsoft Visual Studio, Xamarin, and MonoDevelop integrated development environments to create C#, F#, VB.NET applications.

Fore more details please refer to Product Documentation.

Other Supported DOC Merge operations

You can merge DOC to many other file formats:

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