Convert MHTML to DOCX – C#

MHTML to DOCX conversion is often required to take advantage of DOCX format for specific tasks. DOCX is a well-known format for Microsoft Word documents. It can contain a wide range of data, including text, tables, raster and vector graphics, video, sounds and diagrams. This format is popular because it supports a wide range of formatting features and offers users a variety of options to write any type of document.

In this article, you find information on how to convert MHTML to DOCX using ConvertMHTML() methods of the Converter class and how to apply DocSaveOptions and ICreateStreamProvider parameters.

Online MHTML Converter

You can convert MHTML to DOCX with Aspose.HTML for .NET API in real time. Load an MHTML file from your local file system, select the output format and run the example. In this example, the save options are set by default. You will immediately receive the conversion result as a separate file.

If you want to convert MHTML to DOCX programmatically, please see the following C# code examples.

MHTML to DOCX by two lines of code

The static methods of the Converter class are primarily used as the easiest way to convert an MHTML code into various formats. For example, you can convert MHTML to DOCX in your C# application literally with two lines of code!

// Open an existing MHTML file for reading
using var 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 MHTML to DOCX

Using Converter.ConvertMHTML methods is the most common way to convert MHTML code into various formats. With Aspose.HTML, you can convert MHTML to DOCX format programmatically with full control over a wide range of conversion parameters.

The following C# code snippet shows how to convert MHTML to DOCX using Aspose.HTML for .NET.

1. Open an existing MHTML file.
2. Create an instance of the DocSaveOptions class.
3. Use the ConvertMHTML() method of the Converter class to save MHTML as a DOCX file. You need to pass the MHTML file stream, DocSaveOptions, and output file path to the ConvertMHTML() method for MHTML to DOCX conversion.

In the example, we use the OpenRead() method of System.IO.FileStream class to open and read files from the file system at the specified path.

// Open an existing MHTML file for reading
using var 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
var options = new DocSaveOptions();

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

Save Options

Aspose.HTML allows converting MHTML to DOCX using default or custom save options. DocSaveOptions usage enables you to customize the rendering process; you can specify the page size, margins, resolutions, CSS, etc.

Property	Description
FontEmbeddingRule	This property gets or sets the font embedding rule. Available values are Full and None. The default value is None.
Css	Gets a CssOptions object which is used for configuration of CSS properties processing.
DocumentFormat	This property gets or sets the file format of the output document. The default value is DOCX.
PageSetup	This property gets a page setup object and uses it for configuration output page-set.
HorizontalResolution	Sets horizontal resolution for output images in pixels per inch. The default value is 300 dpi.
VerticalResolution	Sets vertical resolution for output images in pixels per inch. The default value is 300 dpi.

To learn more about DocSaveOptions, please read the Fine-Tuning Converters article.

Convert MHTML to DOCX using DocSaveOptions

To convert MHTML to DOCX with DocSaveOptions specifying, you should follow a few steps:

1. Open an existing MHTML file.
2. Create a new DocSaveOptions object and specify save options.
3. Use the ConvertMHTML() method to save MHTML as a DOCX file. You need to pass the MHTML file stream, DocSaveOptions, and output file path to the ConvertMHTML() method for MHTML to DOCX conversion.

The following example shows how to use DocSaveOptions and create a DOCX file with custom save options:

// Open an existing MHTML file for reading
using var 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 
var 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);

In the example, we use the OpenRead() method of System.IO.FileStream class to open and read source files from the file system at the specified path. The DocSaveOptions() constructor initializes an instance of the DocSaveOptions class that is passed to ConvertMHTML() method. The ConvertMHTML() method takes the stream, options, output file path savePath and performs the conversion operation. The DocSaveOptions class provides numerous properties that give you full control over a wide range of parameters and improve the process of converting MHTML to DOCX format. In the example, we use the PageSetup property that specifies the page size of the DOCX document.

Output Stream Providers

If it is required to save files in the remote storage (e.g., cloud, database, etc.) you can implement ICreateStreamProvider interface to have manual control over the file creating process. This interface is designed as a callback object to create a stream at the beginning of the document/page (depending on the output format) and release the early created stream after rendering the document/page.

Aspose.HTML for .NET provides various types of output formats for rendering operations. Some of these formats produce a single output file (for instance PDF, XPS), others create multiple files (Image formats JPG, PNG, etc.).

The example below shows how to implement and use your own MemoryStreamProvider in the application:

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 (var stream in Streams)
            stream.Dispose();
    }
}

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

// Open an existing MHTML file for reading
using var 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
var 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);
}

Aspose.HTML offers a free online MHTML to DOCX Converter that converts MHTML to DOCX file with high quality, easy and fast. Just upload, convert your files and get results in a few seconds!