Revjon’s FreeTextBox control provides programmers with a user interface element for a WYSIWYG HTML editing environment similar to what is available in word processors. Developers can add text-editing capabilities to ASP.NET (Web Forms) Web Seiten. Users can therefore edit text and click on buttons to format their text, just like in a text editor.

The control is written in C# and has many options for customization. It can be validated using standard ASP.NET validators. The code is not marked CLS compliant, so developers may encounter problems when using it in languages other than C#.

MSHTML is reputed to make certain changes to HTML code, such as changing relative URLs to absolute. Developers can prevent this by using the control’s properties. Some developers have noted that it has problems in Opera 7. It lacks find and replace, as well as a context menu.