PDF to HTML Converter for .NET

Winnovative PDF to HTML Converter can be used in any type of .NET application to convert PDF pages to HTML documents. The integration with existing .NET applications is extremely easy and no installation is necessary. The downloaded archive contains the assembly for .NET and a demo application. The full C# source code for the demo application is available in the Samples folder. The converter produces HTML string objects during conversion that you can save to HTML files or use for further processing. You can also customize the resulted HTML content zoom level and HTML images resolution.

The main features of the PDF to HTML Converter for .NET are:

  • Convert PDF pages to HTML documents
  • Customize the generated HTML content zoom level
  • Customize the HTML images resolution in generated HTML document
  • Convert PDF pages to HTML documents in memory or to HTML files in a folder
  • Support for password protected PDF documents
  • Convert to HTML only a range of PDF pages
  • Get the number of pages in a PDF document
  • Get the PDF document title, keywords, author and description
  • Does not require Adobe Reader or other third party tools
  • Support for .NET 4.0 framework and later
  • Documentation and C# samples for all the features

You can read more about the PDF to HTML to PDF Converter for .NET Features on product website.

C# Sample Code for PDF to HTML Converter

The code below was taken from the PDF to HTML Converter demo application available for download in the PDF to HTML converter archive. In this sample an instance of the PdfToHtmlConverter class is constructed and used to convert the PDF document pages to HTML documents.

private void btnConvertToHtml_Click(object sender, EventArgs e)
{
    if (pdfFileTextBox.Text.Trim().Equals(String.Empty))
    {
        MessageBox.Show("Please choose a source PDF file", "Choose PDF file", MessageBoxButtons.OK);
        return;
    }

    // the source pdf file
    string pdfFileName = pdfFileTextBox.Text.Trim();

    // start page number
    int startPageNumber = int.Parse(textBoxStartPage.Text.Trim());
    // end page number
    // when it is 0 the conversion will continue up to the end of document
    int endPageNumber = 0;
    if (textBoxEndPage.Text.Trim() != String.Empty)
        endPageNumber = int.Parse(textBoxEndPage.Text.Trim());

    // create the converter object and set the user options
    PdfToHtmlConverter pdfToHtmlConverter = new PdfToHtmlConverter();

    // set the resolution of HTML images
    pdfToHtmlConverter.Resolution = int.Parse(textBoxResolution.Text);

    // set the zoom of HTML content
    pdfToHtmlConverter.Zoom = int.Parse(textBoxZoom.Text);

    // the demo output directory
    string outputDirectory = Path.Combine(Application.StartupPath, @"DemoFiles\Output");

    Cursor = Cursors.WaitCursor;
            
    try
    {
        // convert PDF pages to HTML files in a directory
        pdfToHtmlConverter.CreateIndexFile = true;
        pdfToHtmlConverter.ConvertPdfPagesToHtmlFile(pdfFileName, startPageNumber, endPageNumber, outputDirectory, "PdfPage");

        // uncomment the lines below to raise the PageConvertedEvent event when a PDF page is converted
        // the pdfToHtmlConverter_PageConvertedEvent handler below will be executed for each converted PDF page
        // Do not forget to uninstall the handler when is not needed anymore
        //pdfToHtmlConverter.PageConvertedEvent += pdfToHtmlConverter_PageConvertedEvent;
        //pdfToHtmlConverter.ConvertPdfPagesToHtmlInEvent(pdfFileName, startPageNumber, endPageNumber);

        // uncomment the line below to convert PDF pages in memory to an array of PdfPageHtml objects
        //PdfPageHtml[] pdfPageHtmls = pdfToHtmlConverter.ConvertPdfPagesToHtml(pdfFileName, startPageNumber, endPageNumber);
    }
    catch (Exception ex)
    {
        // The conversion failed
        MessageBox.Show(String.Format("An error occurred. {0}", ex.Message), "Error");
        return;
    }
    finally
    {
        Cursor = Cursors.Arrow;
    }

    try
    {
        System.Diagnostics.Process.Start(outputDirectory);
    }
    catch (Exception ex)
    {
        MessageBox.Show(string.Format("Cannot open output folder. {0}", ex.Message));
        return;
    }
}

/// <summary>
/// The PageConvertedEvent event handler called after when a PDF page was converted to HTML
/// The event is raised when the ConvertPdfPagesToHtmlInEvent() method is used
/// </summary>
/// <param name="args">The handler argument containing the PDF page HTML and page number</param>
void pdfToHtmlConverter_PageConvertedEvent(PageConvertedEventArgs args)
{
    // get the HTML document and page number from even handler argument
    string  pdfPageHtml = args.PdfPageHtml.Html;
    int pageNumber = args.PdfPageHtml.PageNumber;

    // save the PDF page HTML to a file
    string outputHtmlFile = Path.Combine(Application.StartupPath, @"DemoFiles\Output", "PdfPage_" + pageNumber + ".html");
    File.WriteAllText(outputHtmlFile, pdfPageHtml, Encoding.UTF8);

    args.PdfPageHtml.Dispose();
}