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

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


    Imagine, that in 15 minutes after reading this text you will be able to provide API for your application to convert Text documents into HTML, using C# or VB.Net.
            SautinSoft.RtfToHtml r = new SautinSoft.RtfToHtml();
            string textFile = @"c:\The Egypt In My Looking Glass.txt";
            string htmlFile = @"c:\The Egypt In My Looking Glass.html";

            r.OutputFormat = RtfToHtml.eOutputFormat.HTML_5;
            r.ConvertFile(textFile, htmlFile);
The library gives you a full set of API to convert Text to HTML. Furthermore, during conversion to HTML you may adjust following:
  • Various output format: HTML 3.2, HTML 4.01, HTML 5, XHTML, Text.
  • Generating output document in plain HTML 3.2 without CSS.
  • Save CSS data between tags <style>...</style> or as inline styles <tag style="...">.
  • Specify encoding of output HTML.
  • Set up document Title; create only the part of HTML between <body>...</body> tags.
  • Set up a common font, size and color for a whole document.
  • Detect hyperlinks from text and make them real hyperlinks.
  • Specify the table borders visibility.

Nuget  Online Demo   Download, (Jan 27-th, 2020)

Have a Question?

You have a question, need a support or a code example: ask our support team at We will help you quickly and with pleasure.

What "RTF to HTML .Net" can give me:

  1. Save time and cost of the product development. The writing of own RTF to HTML converter in C# requires a lot of days of hard work and takes approx 50 000 C# code lines. "RTF to HTML .Net" will save a lot of my time and I'll need only to add the reference to "SautinSoft.RtfToHtml.dll" and write 3-4 C# code lines.

  2. The one product provides me by set of API to convert Text, DOCX and RTF document at various formats at once: HTML 3.2, 4.01, HTML5 and XHTML with CSS.

  3. Because of this is absolutely standalone .NET assembly, my clients don't need to have MS Word, Internet Explorer or other software.

  4. My software will produce well-formed HTML compatible with all W3C standards, you may check this.

  5. The one time price. I pay a one time and can use «RTF to HTML .Net» for a whole life without any additional fees. My license will never expires.

  6. As bonus, I get unlimited technical support during a whole life for free and independently of the date of my purchasing.

Some examples to convert Text to HTML in C# and VB.Net

1. Convert Text file to HTML file in C#:

            SautinSoft.RtfToHtml r = new SautinSoft.RtfToHtml();
            string textFile = @"d:\The Librarian.txt";
            string htmlFile = Path.ChangeExtension(textFile, ".html");

            r.OutputFormat = SautinSoft.RtfToHtml.eOutputFormat.HTML_5;
            if (r.ConvertFile(textFile, htmlFile)==0)
                // Open HTML in browser.
2. Convert Text to HTML in memory using C#.
            SautinSoft.RtfToHtml r = new SautinSoft.RtfToHtml();
            string textFile = @"d:\The Lynx.txt";
            string textString = File.ReadAllText(textFile);

            string htmlString = r.ConvertString(textString);
3. Convert Text to HTML in VB.Net; make all CSS styles inline, i.e. put within the attribute style="...".
            Dim r As New SautinSoft.RtfToHtml()

            ' Set HTML5 format.
            r.OutputFormat = SautinSoft.RtfToHtml.eOutputFormat.HTML_5
            ' Set utf-8 encoding.
            r.Encoding = SautinSoft.RtfToHtml.eEncoding.UTF_8
            ' Make all CSS inline.
            r.TextStyle.InlineCSS = True

            Dim textFile As String = "e:\Returns and Exchanges.txt"
            Dim htmlFile As String = Path.ChangeExtension(textFile, ".html")
            r.ConvertFile(textFile, htmlFile)
If anyone needs a code sample in C#, VB.Net, ASP.Net etc "How to convert Text to HTML", email us at or ask at Online Chat (right-bottom corner of this page). We'll help you certainly!

Requirements and Technical Information

     «RTF to HTML .Net» can be used on 32 and 64-bits platforms with .NET 4.0 and higher. The component doesn't require Internet Explorer, Microsoft Office or any other software. It's absolutely standalone and independent library.

The DOCX conversion works starting from .NET 4.0. If you are looking for a standalone C# library to create and parse Word documents, try our Document .Net.

Our product is compatible with all .NET languages and supports all Operating Systems where .NET Framework can be used. Note that «RTF to HTML .Net» is entirely written in managed C#.

.Net Framework 4.0 and higher and .Net Core 2.0 and higher

.NET Framework 4.0, 4.5, 4.6.1 and higher.

.NET Standard 2.0

.NET Core 2.0 and higher.

Multi-platform component, runs on:

Our component has proven itself on cloud platforms and services:

  • Microsoft Azure
  • Amazon Web Services (AWS)
  • Google Cloud Platform
  • SharePoint
  • Docker
  • etc.

Reasonable prices

     The library offers developers high quality conversion at reasonable prices. The main point of interest is that «RTF to HTML .Net» is less expensive than all of its more or less popular counterparts. For example, a single license cost $339(US) with no additional fees or royalties!


To see this functionality firsthand, download the freshest «RTF to HTML .Net» with code examples, 40.6 Mb.


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