Convert HTML to DOCX in C#

To convert HTML to DOCX in C#, use Converter.ConvertHTML() with an HTML source, DocSaveOptions, and an output path or stream provider. Aspose.HTML for .NET can convert HTML from a file, string, stream, or URL, and DocSaveOptions lets you control DOCX rendering settings such as page setup, CSS handling, document format, resolution, and font embedding.

This guide shows the core HTML to DOCX workflows for C# applications: a one-line conversion, a file-based conversion, custom DOCX save options, and output stream handling with ICreateStreamProvider. 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 HTML to DOCX with One Line of C#

For simple input, the static Converter class provides a short path from HTML content to a DOCX file. The example below passes HTML code, a base URI, default DocSaveOptions, and the output file path to ConvertHTML().

// Convert HTML to DOCX in C#

// Invoke the ConvertHTML() method to convert HTML to DOCX
Converter.ConvertHTML(@"<h1>Convert HTML to DOCX!</h1>", ".", new DocSaveOptions(), Path.Combine(OutputDir, "convert-with-single-line.docx"));

Use this pattern when your HTML is already available as a string and default DOCX settings are enough. For file input, custom options, or stream output, use the workflows below.

Convert an HTML File to DOCX in C#

A typical file-based conversion uses an HTMLDocument instance, a DocSaveOptions object, and Converter.ConvertHTML(). You can load HTML from a local file, HTML code, stream, or URL. For more loading patterns, see Creating an HTML Document.

The workflow is:

1. Load the HTML file with an HTMLDocument constructor.
2. Create a DocSaveOptions instance.
3. Call Converter.ConvertHTML(document, options, savePath) to write the DOCX file.

The following C# code converts an HTML document to DOCX.

// Convert HTML to DOCX using C#

// Prepare a path to a source HTML file
string documentPath = Path.Combine(DataDir, "canvas.html");

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

// Initialize an HTML document from the file
using HTMLDocument document = new HTMLDocument(documentPath);

// Initialize DocSaveOptions
DocSaveOptions options = new DocSaveOptions();

// Convert HTML to DOCX
Converter.ConvertHTML(document, options, savePath);

Short HTML to DOCX Recipes

• Convert an HTML string to DOCX – pass the HTML content, base URI, DocSaveOptions, and output path to Converter.ConvertHTML().
• Convert an HTML file to DOCX – load the file with HTMLDocument, create DocSaveOptions, and call Converter.ConvertHTML(document, options, savePath).
• Convert HTML from a URL to DOCX – create an HTMLDocument from the URL, then convert the loaded document with DOCX save options.
• Set DOCX page size and margins – configure DocSaveOptions.PageSetup; see Resize Document During Conversion.
• Control font embedding – configure DocSaveOptions.FontEmbeddingRule when your DOCX output needs embedded fonts.
• Save DOCX output to memory or custom storage – implement ICreateStreamProvider and pass it to the conversion workflow.

Customize HTML to DOCX with DocSaveOptions

Use DocSaveOptions when the output DOCX needs custom rendering settings. The options object is passed to ConvertHTML() and controls how the HTML document is rendered to a Word-compatible document.

Option	Use it to control
FontEmbeddingRule	Whether fonts are embedded in the generated DOCX document. 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.

The following example creates a DOCX file with custom DocSaveOptions.

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

string documentPath = Path.Combine(OutputDir, "save-options.html");
string savePath = Path.Combine(OutputDir, "save-options-output.docx");

// Prepare HTML code and save it to a file
string code = "<h1>DocSaveOptions Class</h1>\r\n" +
              "<p>Using DocSaveOptions Class, you can programmatically apply a wide range of conversion parameters.</p>\r\n";

File.WriteAllText(documentPath, code);

// Initialize an HTML Document from the html file
using HTMLDocument document = new HTMLDocument(documentPath);

// Initialize DocSaveOptions. 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)));

// Convert HTML to DOCX
Converter.ConvertHTML(document, options, savePath);

In this example, DocSaveOptions is passed to Converter.ConvertHTML() together with the loaded HTML document and output path. The sample configures PageSetup to control the page size used in the generated DOCX file.

Related DOCX Workflows

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

Save HTML 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, or services that need to decide where the rendered output is stored.

Some output formats produce one file, such as PDF, XPS, and DOCX. Image formats such as JPG or PNG can produce multiple output streams when the rendered document has multiple pages.

The MemoryStreamProvider class below implements ICreateStreamProvider and keeps the generated streams in memory.

// 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 HTML to DOCX with MemoryStreamProvider, reads the generated memory stream, and saves it to a DOCX file.

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

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

// Initialize an HTML document
using HTMLDocument document = new HTMLDocument(@"<h1>Convert HTML to DOCX File Format!</h1>", ".");

// Convert HTML to DOCX using the MemoryStreamProvider
Converter.ConvertHTML(document, 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(Path.Combine(OutputDir, "stream-provider.docx")))
{
    memory.CopyTo(fs);
}

Related HTML Conversion Guides

• Convert HTML to PDF – create PDF output with PdfSaveOptions.
• Convert HTML to XPS – render HTML to XPS output.
• Convert HTML to PNG – render HTML to PNG images.
• Convert HTML to JPG – render HTML to JPEG images.
• Convert HTML to MHTML – package HTML and resources into a single web archive.
• Convert HTML to Markdown – transform HTML content into Markdown.

Other Platforms

• Convert HTML to DOCX in Java
• Convert HTML to DOCX in Python via .NET

Try Online HTML to DOCX Conversion

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