Convert MHTML to DOCX in C#

To convert MHTML to DOCX in C#, open the MHTML file as a stream, create DocSaveOptions, and call Converter.ConvertMHTML() with the stream, options, and output path or stream provider.

MHTML stores a web page and its linked resources in a single archive. DOCX is useful when that archived content must become an editable Word document for review, collaboration, reporting, or office workflows.

Before running the examples, install and configure Aspose.HTML for .NET in your project. The complete C# example project is available in the Aspose.HTML for .NET GitHub repository.

Convert MHTML to DOCX with Two Lines of C#

The static Converter class provides the shortest path from an MHTML stream to a DOCX file. The example below opens an MHTML file and converts it to DOCX with default DocSaveOptions.

// Convert MHTML to DOCX in C#

// Open an existing MHTML file for reading
using FileStream stream = File.OpenRead(DataDir + "sample.mht");

// Invoke the ConvertMHTML() method to convert MHTML to DOCX
Converter.ConvertMHTML(stream, new DocSaveOptions(), Path.Combine(OutputDir, "convert-by-two-lines.docx"));

Convert an MHTML File to DOCX in C#

Use this workflow when the MHTML source exists on disk and the DOCX should be saved to a file path.

The workflow is:

1. Open the MHTML file with File.OpenRead() or another readable stream.
2. Create a DocSaveOptions instance.
3. Call Converter.ConvertMHTML(stream, options, savePath).
4. Save the generated DOCX file to the target output path.

// Convert MHTML to DOCX using C#

// Open an existing MHTML file for reading
using FileStream stream = File.OpenRead(DataDir + "sample.mht");

// Prepare a path to save the converted file
string savePath = Path.Combine(OutputDir, "sample-output.docx");

// Create an instance of DocSaveOptions
DocSaveOptions options = new DocSaveOptions();

// Call the ConvertMHTML() method to convert MHTML to DOCX
Converter.ConvertMHTML(stream, options, savePath);

Customize MHTML to DOCX with DocSaveOptions

Use DocSaveOptions when the generated DOCX file needs custom rendering settings.

To customize MHTML to DOCX conversion:

1. Open the MHTML source stream.
2. Create DocSaveOptions.
3. Configure only the settings required by the output, such as PageSetup, FontEmbeddingRule, DocumentFormat, CSS processing, or resolution.
4. Pass the stream, options, and output path to Converter.ConvertMHTML().

Option	Use it to control
FontEmbeddingRule	Font embedding in the output document. Available values are Full and None; the default value is None.
Css	CSS processing behavior through CssOptions.
DocumentFormat	The output document format. The default value is DOCX.
PageSetup	Page size, margins, and page layout settings.
HorizontalResolution and VerticalResolution	Output resolution values used by the rendering process. The default value is 300 dpi for each property.

// Convert MHTML to DOCX in C# with custom settings

// Open an existing MHTML file for reading
using FileStream stream = File.OpenRead(DataDir + "sample.mht");

// Prepare a path to save the converted file
string savePath = Path.Combine(OutputDir, "sample-options.docx");

// Create an instance of DocxSaveOptions and set A5 as a page size 
DocSaveOptions options = new DocSaveOptions();
options.PageSetup.AnyPage = new Page(new Aspose.Html.Drawing.Size(Length.FromInches(8.3f), Length.FromInches(5.8f)));

// Call the ConvertMHTML() method to convert MHTML to DOCX
Converter.ConvertMHTML(stream, options, savePath);

Related DOCX Workflows

• How to Resize Document During Conversion from HTML?
• Set Font Folder to Render HTML
• Fine-Tuning Converters
• Rendering Options

Save MHTML to DOCX with an Output Stream Provider

Use ICreateStreamProvider when the conversion output should be written through streams instead of only to a file path. This is useful for memory-based workflows, remote storage, databases, and services that decide where the rendered output is stored.

// Implement a custom MemoryStream provider for advanced control over HTML rendering output streams

class MemoryStreamProvider : Aspose.Html.IO.ICreateStreamProvider
{
    // List of MemoryStream objects created during the document rendering
    public List<MemoryStream> Streams { get; } = new List<MemoryStream>();

    public Stream GetStream(string name, string extension)
    {
        // This method is called when only one output stream is required, for instance for XPS, PDF or TIFF formats
        MemoryStream result = new MemoryStream();
        Streams.Add(result);
        return result;
    }

    public Stream GetStream(string name, string extension, int page)
    {
        // This method is called when the creation of multiple output streams are required. For instance, during the rendering HTML to list of image files (JPG, PNG, etc.)
        MemoryStream result = new MemoryStream();
        Streams.Add(result);
        return result;
    }

    public void ReleaseStream(Stream stream)
    {
        // Here you can release the stream filled with data and, for instance, flush it to the hard-drive
    }

    public void Dispose()
    {
        // Releasing resources
        foreach (MemoryStream stream in Streams)
            stream.Dispose();
    }
}

The following example converts MHTML to DOCX with MemoryStreamProvider.

// Convert MHTML to DOCX in C# using memory stream

// Create an instance of MemoryStreamProvider
using MemoryStreamProvider streamProvider = new MemoryStreamProvider();

// Open an existing MHTML file for reading
using FileStream stream = File.OpenRead(DataDir + "sample.mht");

// Prepare a path to save the converted file
string savePath = Path.Combine(OutputDir, "stream-provider.docx");

// Convert MHTML to DOCX by using the MemoryStreamProvider class
Converter.ConvertMHTML(stream, new DocSaveOptions(), streamProvider);

// Get access to the memory stream that contains the result data
MemoryStream memory = streamProvider.Streams.First();
memory.Seek(0, SeekOrigin.Begin);

// Flush the result data to the output file
using (FileStream fs = File.Create(savePath))
{
    memory.CopyTo(fs);
}

Related MHTML Conversion Guides

• Convert MHTML to PDF – render an MHTML archive as a PDF document.
• Convert MHTML to XPS – render MHTML as fixed-layout XPS output.
• Convert MHTML to Image – render MHTML as JPG, PNG, BMP, GIF, or TIFF.

Other Platforms

• MHTML Converter in Java
• Convert MHTML to DOCX in Python via .NET

Try Online MHTML to DOCX Conversion

Use the online MHTML to DOCX Converter for quick manual conversion. Use Aspose.HTML for .NET when MHTML to DOCX conversion must run inside a C# application, service, or document pipeline.