How to Convert RTF to HTML using C#. For more information, please follow link: https://kb.conholdate.com/total/net/how-to-convert-rtf-to-html-using-csharp/

how-to-convert-rtf-to-html-using-c#.cs

using System;
using GroupDocs.Conversion;
using GroupDocs.Conversion.Options.Convert;

namespace ConvertRtfToHtmlUsingCSharp
{
    class Program
    {

        static void Main(string[] args)
        {
            // Load the RTF file to perfrom RTF to HTML conversion
            using (Converter converterRTFFile = new Converter("sample.rtf"))
            {
                // Use the MarkupConvertOptions class to customize conversion
                MarkupConvertOptions RTFToHTMLOptions = new MarkupConvertOptions
                {
                    PageNumber = 2,
                    PagesCount = 1,
                    FixedLayout = true
                };
                // Call the Convert Method to perfrom the RTF to HTML conversion
                // This method will output the file to your destination path
                converterRTFFile.Convert("converted-rtf.html", RTFToHTMLOptions);
                Console.WriteLine("Done");
            }
        }
    }
}