Converting Word documents to HTML is a common requirement when publishing content on websites, building document viewers, or integrating Word files into web applications. Using .NET Cloud SDK, you can easily convert DOC and DOCX files into clean, standards-compliant HTML without relying on Microsoft Word or desktop automation.

In this guide, you’ll learn how to perform Word to HTML conversion using C# via a secure and scalable REST-based .NET Cloud SDK.

API for Word to HTML Conversion

The GroupDocs.Conversion Cloud SDK for .NET provides a powerful and platform-independent solution for converting Word documents into HTML. It preserves text formatting, tables, images, and layout while producing web-friendly output.

Key Features

  • Convert DOC and DOCX to HTML with high fidelity
  • No Microsoft Office dependency
  • Cloud-based REST API architecture
  • OAuth 2.0 secured authentication
  • Save output to cloud storage or download locally
  • Easy integration with .NET (C#) applications

Install SDK via NuGet

Install-Package GroupDocs.Conversion-Cloud

Create your Client ID and Client Secret from the GroupDocs Cloud Dashboard.

Convert Word to HTML in C#

Follow these steps to convert a Word document to HTML using C# and the .NET Cloud SDK.

Step 1: Configure API Credentials

var config = new Configuration
{
    ClientId = "YOUR_CLIENT_ID",
    ClientSecret = "YOUR_CLIENT_SECRET"
};

var convertApi = new ConvertApi(config);
var fileApi = new FileApi(config);

Step 2: Upload Word Document to Cloud Storage

using (var fileStream = File.OpenRead("sample.docx"))
{
    var uploadRequest = new UploadFileRequest("sample.docx", fileStream);
    fileApi.UploadFile(uploadRequest);
}

Step 3: Define HTML Conversion Settings

var settings = new ConvertSettings
{
    FilePath = "sample.docx",
    Format = "html",
    OutputPath = "converted/sample.html"
};

Step 4: Convert Word to HTML

var request = new ConvertDocumentRequest(settings);
convertApi.ConvertDocument(request);

Console.WriteLine("Word document successfully converted to HTML.");

DOCX to HTML using cURL

You can also convert Word documents to HTML using the REST API directly with cURL.

curl -v "https://api.groupdocs.cloud/v2.0/conversion" \
-X POST \
-H "accept: application/json" \
-H "authorization: Bearer {ACCESS_TOKEN}" \
-H "Content-Type: application/json" \
-d "{  \"StorageName\": \"default\",  \"FilePath\": \"{sourceFile}\",  \"Format\": \"html\"}" \
-o "{resultantFile}"

Replace {ACCESS_TOKEN} with your JWT token generated using client credentials.

Free Online Word to HTML Converter

Looking for a no-code option? Try the free Word to HTML online converter powered by GroupDocs.Conversion Cloud.

Free DOCX to HTML converter

Useful Resources

Conclusion

We have learnt that .NET REST API makes Word to HTML conversion fast, reliable, and scalable. Whether you’re building a document viewer, publishing Word content on the web, or integrating document conversion into your .NET application, this API provides everything you need with minimal code.

❓ Frequently Asked Questions (FAQs)

  1. How do I convert Word Document to HTML in C#? Use GroupDocs.Conversion Cloud SDK for .NET and call the ConvertDocument() API to convert Word document to HTML format.

  2. Can I convert DOCX to HTML as well? Yes. The .NET Cloud SDK supports both DOC and DOCX to HTML for complete document management workflows.

  3. Can I test the API without any limitations? Yes. You can request a free 30 days trial license to test the API without any limitations.