Convert RTF to HTML format in C# and .NET

  1. Add SautinSoft.Document from Nuget.
  2. Load an input document.
  3. Save to a HTML format.

Document .Net can help your application to convert a document from a one format to another.
You'll need only to Load() a document and Save() to a desired format.


            DocumentCore dc = DocumentCore.Load("...");
            dc.Save("....");

Document .Net supports these formats:

PDF DOCX RTF HTML Text Image
Create/Read/Write Create/Read/Write Create/Read/Write Create/Read/Write Create/Read/Write Create/Read(OCR)/Write

Complete code

using System.IO;
using SautinSoft.Document;

namespace Example
{
    class Program
    {
        static void Main(string[] args)
        {
            // Get your free trial key here:   
            // https://sautinsoft.com/start-for-free/

            ConvertFromFile();
            ConvertFromStream();
        }

        /// <summary>
        /// Convert RTF to HTML (file to file).
        /// </summary>
		/// <remarks>
        /// Details: https://sautinsoft.com/products/document/help/net/developer-guide/convert-rtf-to-html-in-csharp-vb.php
        /// </remarks>
        static void ConvertFromFile()
        {
            string inpFile = @"..\..\..\example.rtf";
            string outFile = @"Result.html";

            DocumentCore dc = DocumentCore.Load(inpFile);
            dc.Save(outFile);
			
			// Important for Linux: Install MS Fonts
			// sudo apt install ttf-mscorefonts-installer -y

            // Open the result for demonstration purposes.
            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outFile) { UseShellExecute = true });
        }

        /// <summary>
        /// Convert RTF to HTML (using Stream).
        /// </summary>
		/// <remarks>
        /// Details: https://sautinsoft.com/products/document/help/net/developer-guide/convert-rtf-to-html-in-csharp-vb.php
        /// </remarks>
        static void ConvertFromStream()
        {

            // We need files only for demonstration purposes.
            // The conversion process will be done completely in memory.
            string inpFile = @"..\..\..\example.rtf";
            string outFile = @"ResultStream.html";
            byte[] inpData = File.ReadAllBytes(inpFile);
            byte[] outData = null;

            using (MemoryStream msInp = new MemoryStream(inpData))
            {

                // Load a document.
                DocumentCore dc = DocumentCore.Load(msInp, new RtfLoadOptions());

                // Save the document to HTML format.
                using (MemoryStream outMs = new MemoryStream())
                {
                    dc.Save(outMs, new HtmlFixedSaveOptions() );
                    outData = outMs.ToArray();   

				// Important for Linux: Install MS Fonts
				// sudo apt install ttf-mscorefonts-installer -y					
                }
                // Show the result for demonstration purposes.
                if (outData != null)
                {
                    File.WriteAllBytes(outFile, outData);
                    System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outFile) { UseShellExecute = true });
                }
            }
        }
    }
}

Download

Imports System.IO
Imports SautinSoft.Document

Namespace Example
	Friend Class Program
		Shared Sub Main(ByVal args() As String)
			ConvertFromFile()
			ConvertFromStream()
		End Sub
                ''' Get your free trial key here:   
                ''' https://sautinsoft.com/start-for-free/
		''' <summary>
		''' Convert RTF to HTML (file to file).
		''' </summary>
		''' <remarks>
		''' Details: https://sautinsoft.com/products/document/help/net/developer-guide/convert-rtf-to-html-in-csharp-vb.php
		''' </remarks>
		Private Shared Sub ConvertFromFile()
			Dim inpFile As String = "..\..\..\example.rtf"
			Dim outFile As String = "Result.html"

			Dim dc As DocumentCore = DocumentCore.Load(inpFile)
			dc.Save(outFile)
			
			' Important for Linux: Install MS Fonts
			' sudo apt install ttf-mscorefonts-installer -y

			' Open the result for demonstration purposes.
			System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(outFile) With {.UseShellExecute = True})
		End Sub

		''' <summary>
		''' Convert RTF to HTML (using Stream).
		''' </summary>
		''' <remarks>
		''' Details: https://sautinsoft.com/products/document/help/net/developer-guide/convert-rtf-to-html-in-csharp-vb.php
		''' </remarks>
		Private Shared Sub ConvertFromStream()

			' We need files only for demonstration purposes.
			' The conversion process will be done completely in memory.
			Dim inpFile As String = "..\..\..\example.rtf"
			Dim outFile As String = "ResultStream.html"
			Dim inpData() As Byte = File.ReadAllBytes(inpFile)
			Dim outData() As Byte = Nothing

			Using msInp As New MemoryStream(inpData)

				' Load a document.
				Dim dc As DocumentCore = DocumentCore.Load(msInp, New RtfLoadOptions())

				' Save the document to HTML format.
				Using outMs As New MemoryStream()
					dc.Save(outMs, New HtmlFixedSaveOptions())
					outData = outMs.ToArray()
				End Using
				' Show the result for demonstration purposes.
				If outData IsNot Nothing Then
					File.WriteAllBytes(outFile, outData)
					System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(outFile) With {.UseShellExecute = True})
				End If
			End Using
		End Sub
	End Class
End Namespace

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Questions and suggestions from you are always welcome!

We are developing .Net components since 2002. We know PDF, DOCX, RTF, HTML, XLSX and Images formats. If you need any assistance with creating, modifying or converting documents in various formats, we can help you. We will write any code example for you absolutely free.