PDF is a file format that is used to present documents in a manner that is independent of the application software, hardware, and operating system used to create or view them. However, PDFs are not easily editable and are not well-suited for web pages. Converting a PDF to HTML allows the content of the document to be easily edited, searched, and indexed by search engines, and allows the document to be more easily viewed on the web. In this article, we will learn how to convert PDF documents into PDF format using C#.

Convert PDF to HTML in CSharp.

.NET API to Convert PDF Files to HTML

GroupDocs provides a document conversion solution to empower developers with automation. It helps programmers in the conversion of various documents and image formats with its efficient and reliable .NET API. Today, I will use its GroupDocs.Conversion for .NET API to convert PDF documents into HTML format.

You can download the DLLs or MSI installer from the downloads section or install the API in your .NET application via NuGet.

PM> Install-Package GroupDocs.Conversion

How to Convert a PDF to HTML using C#

Let’s start with the basic conversion of a PDF file into HTML format using C#. The following steps transform all the pages of a PDF file into HTML.

  • Load the PDF file using the Converter class.
  • Call the Convert method to transform the loaded document into PDF format.

The following C# code converts the whole PDF document into HTML.

Convert Selected Pages of Password-Protected PDF Documents using C#

You can also convert protected or locked PDF documents. The following steps show how to convert selective pages of a locked PDF document into HTML format using C#.

  • Prepare the loading options using the PdfLoadOptions class.
  • Now, load the PDF file using the Converter class.
  • Prepare the conversion options for the HTML format using the WebConvertOptions class.
  • Define the list of conversion candidate pages using Pages, PageNumber, PageCount, Zoom, and other properties.
  • Lastly, use the Convert method to transform the loaded PDF file into HTML format.

The following C# code converts the selected pages of the password-protected PDF document into HTML.

PDF to HTML output


To conclude the article, we discussed the PDF to HTML conversion using C#. We separately implemented two different conversions. First, we converted the whole document using the default conversion options. Furthermore, we converted the selected pages of a password-protected document into HTML using the same .NET API.

You can learn more about the .NET Conversion Automation API using the documentation, API Reference, or by experiencing the GitHub examples. You can reach us for any query via the forum.

See Also