To reproduce: Import the following rtf: string rtfText = @"{\rtf1\ansi\ansicpg1252\deff0\deflang1031{\fonttbl{\f0\fnil\fcharset0 Arial;}{\f1\fnil\fcharset0 Tahoma;}{\f2\fnil\fcharset0 Times New Roman;}{\f3\fnil\fcharset0 Arial Unicode MS;}{\f4\fnil\fcharset0 Calibri;}} {\colortbl ;\red0\green0\blue0;} \viewkind4\uc1\pard\tx300\tx600\tx900\tx1200\tx1500\tx1800\tx2100\tx2400\tx2700\tx3000\tx3300\tx3600\tx3900\tx4200\tx4500\cf1\b\fs32 Arial\f1\par Tahoma\par \f2 Times New Roman\par \f0 Arial\f2\par \f3 Arial Unicode MS\par \f4 Calibri\b0\f0\fs20\par }"; RtfFormatProvider rtf = new RtfFormatProvider(); this.radRichTextEditor1.Document = rtf.Import(rtfText); this.richTextBox1.Rtf = rtfText;