How to write a function to convert HTML to RTF in C# for 15 minutes?

Introduction

            SautinSoft.HtmlToRtf h = new SautinSoft.HtmlToRtf();
            string html = @"<p>Hello World!</p>";
            string rtf = String.Empty;
            if (h.OpenHtml(html))
            {
                rtf = h.ToRtf();
            }

• Download the latest «HTML to RTF .Net» SDK.
• Follow to the "Solution Explorer" tab and add a reference to the "SautinSoft.HtmlToRtf.dll".

Nuget  Online Demo   Download, 7.1.4.17 (Apr 17th, 2019)

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At the final point of this page we've prepared five various examples to convert HTML to RTF.

Five examples to convert HTML to RTF in C# and VB.Net

1. Simple conversion of HTML file to RTF file in C#:

            SautinSoft.HtmlToRtf h = new SautinSoft.HtmlToRtf();

            string inputFile = @"d:\sample.html";
            string outputFile = Path.ChangeExtension(inputFile, ".rtf");

            if (h.OpenHtml(inputFile))
            {
                bool ok = h.ToRtf(outputFile);

                // Open the result for demonstation purposes.
                if (ok)
                    System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outputFile)
                    { UseShellExecute = true });
            }

            SautinSoft.HtmlToRtf h = new SautinSoft.HtmlToRtf();

            // Let's set some page options.
            h.PageStyle.PageSize.Letter();
            h.PageStyle.PageOrientation.Landscape();

            h.PageStyle.PageNumbers.Format = "Page {page} of {numpages}";
            h.PageStyle.PageNumbers.AlignH = SautinSoft.HtmlToRtf.eAlign.Center;
            h.PageStyle.PageNumbers.AlignV = SautinSoft.HtmlToRtf.eAlign.Bottom;

            string inputFile = @"d:\utf-8.html";
            string outputFile = Path.ChangeExtension(inputFile, ".rtf");

            // Specify the 'BaseURL' property that component can find the full path to images, like a: <img src="..\pict.png" and
            // to external css, like a:  <link rel="stylesheet" href="/css/style.css" >.
            h.BaseURL = Path.GetFullPath(inputFile);

            using (FileStream htmlFileStrem = new FileStream(inputFile, FileMode.Open))
            {
                if (h.OpenHtml(htmlFileStrem))
                {
                    using (MemoryStream rtfMemoryStream = new MemoryStream())
                    {
                        bool ok = h.ToRtf(rtfMemoryStream);

                        // Open the result for demonstation purposes.
                        if (ok)
                        {
                            File.WriteAllBytes(outputFile, rtfMemoryStream.ToArray());
                            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outputFile)
                            { UseShellExecute = true });
                        }
                    }
                }
            }

        Dim h As New SautinSoft.HtmlToRtf()

        Dim inputFile As String = "d:\utf-8.html"
        Dim outputFile As String = Path.ChangeExtension(inputFile, ".rtf")

        ' Let's set some page options.
        h.PageStyle.PageSize.Letter()
        h.PageStyle.PageOrientation.Landscape()

        h.PageStyle.PageNumbers.Format = "Page {page} of {numpages}"
        h.PageStyle.PageNumbers.AlignH = SautinSoft.HtmlToRtf.eAlign.Center
        h.PageStyle.PageNumbers.AlignV = SautinSoft.HtmlToRtf.eAlign.Bottom

        ' Specify the 'BaseURL' property that component can find the full path to images, like a: <img src="..\pict.png" and
        ' to external css, like a:  <link rel="stylesheet" href="/css/style.css">.
        h.BaseURL = Path.GetFullPath(inputFile)

        Using htmlFileStrem As New FileStream(inputFile, FileMode.Open)
            If h.OpenHtml(htmlFileStrem) Then
                Using rtfMemoryStream As New MemoryStream()
                    Dim ok As Boolean = h.ToRtf(rtfMemoryStream)
                    ' Open the result for demonstation purposes.
                    If ok Then
                        File.WriteAllBytes(outputFile, rtfMemoryStream.ToArray())
                        System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(outputFile) 
                            With { .UseShellExecute = True})
                    End If
                End Using
            End If
        End Using

            SautinSoft.HtmlToRtf h = new SautinSoft.HtmlToRtf();
            string inputFile = @"d:\sample.html";
            string outputFile = Path.ChangeExtension(inputFile, ".rtf");

            // Add a header from HTML string.
            h.PageStyle.PageHeader.Html("This is a bold italic line.");

            // Add a footer from RTF file.
            h.PageStyle.PageFooter.FromRtfFile(@"d:\footer.rtf");

            // Make the conversion of HTML to RTF.
            if (h.OpenHtml(inputFile))
            {
                bool ok = h.ToRtf(outputFile);

                // Open the result for demonstation purposes.
                if (ok)
                    System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outputFile)
                    { UseShellExecute = true });
            }

            SautinSoft.HtmlToRtf h = new HtmlToRtf();
            string htmlPath = @"d:\Fathers and Sons.html";
            string htmlString = File.ReadAllText(htmlPath);
            string rtfPath = Path.ChangeExtension(htmlPath, ".rtf");

            List<HtmlToRtf.SautinImage> imgList = new List<HtmlToRtf.SautinImage>();

            h.BaseURL = @"d:\";

            // Convert HTML to and place all images inside imgList.
            h.ConvertString(htmlString, imgList);

            // Save all images to HDD.
            foreach (HtmlToRtf.SautinImage img in imgList)
            {
                img.Img.Save(String.Format(@"d:\{0}.png", img.Cid));
            }

Requrements and Technical Information

     Requires only .NET Framework 4.0 and up or .NET Core 2.0 and up. Our product is compatible with all .NET languages and supports all Operating Systems where .NET Framework and .NET Core can be used.
Note, that «HTML to RTF .Net» is entirely written in managed C#, which makes it absolutely standalone and an independent library.

	.NET Framework 4.0, 4.5, 4.6.1 and up. .NET Core 2.0 and up.
	Multi-platform component, runs on: Windows Linux Mac OS

Reasonable prices

Download

To see this functionality firsthand, download the freshest «HTML to RTF .Net» with code examples, 21.1 Mb.