HTML is the universal format for web content, making Word‑to‑HTML or Word‑to‑MHTML conversion essential for C++ developers who need to display documents in browsers or email clients. Aspose.Words for C++ provides a powerful, high‑performance API that simplifies converting Microsoft Word files (DOC/DOCX) to HTML or MHTML with advanced options such as embedded fonts and round‑trip metadata.

In this guide we cover:

C++ Microsoft Word Files Converter API – Installation

First, install Aspose.Words for C++ to enable Word document processing. The library is available via the NuGet gallery. Run the following command in the Package Manager Console:

Install-Package Aspose.Words.Cpp -Version 20.8.0

After installation, include the Aspose.Words headers in your C++ project to start converting DOC/DOCX files.

Convert Word (DOCX/DOC) to HTML using C++

Converting Word to HTML lets you render document content directly in a web browser. The conversion process consists of two simple steps:

  1. Load the source Word file.
  2. Save the document as HTML.

The snippet below demonstrates a minimal C++ program that loads a DOCX file and saves it as an HTML page.

Convert Word to HTML with Embedded Fonts using C++

Documents often use custom fonts that may not be available on the target device, resulting in garbled text. Aspose.Words for C++ can embed these fonts directly into the HTML output using Base64 encoding. Set the ExportFontsAsBase64 property before saving.

Steps:

  1. Load the source DOCX file.
  2. Enable ExportFontsAsBase64.
  3. Save the HTML file.

The following code shows how to embed fonts in the generated HTML:

When you open the resulting HTML in a browser or view the source in a text editor, you will see the font data encoded as Base64 strings.

Convert Word to HTML

Convert Word to HTML with Round‑Trip Information in C++

HTML cannot represent every feature of a Word document. To preserve advanced Word features (such as comments, revisions, or custom XML) during a round‑trip conversion (Word → HTML → Word), enable ExportRoundtripInformation. This stores additional metadata in the HTML file, ensuring a lossless return to the original Word format.

Procedure:

  1. Load the source DOCX file.
  2. Set ExportRoundtripInformation to true.
  3. Save the document as HTML.

The example below illustrates how to activate round‑trip information:

Convert Word to MHTML in C++

MHTML bundles HTML, images, CSS, and other resources into a single file, simplifying distribution via email or offline viewing. Converting Word to MHTML with Aspose.Words follows the same two‑step pattern:

  1. Load the source DOCX file.
  2. Save the document in MHTML format.

The code snippet below performs the conversion:

Conclusion

This article demonstrated how to convert Word DOC/DOCX files to HTML or MHTML using C++. We covered basic conversion, embedding fonts as Base64, preserving round‑trip information, and generating single‑file MHTML output. For further assistance, visit our Free Support Forum.

See Also