Richtexteditor allows you use maxHTMLLength or maxTextLength to limit the length of the user's input.
In this example, maxHTMLLength is set to 200.
<link rel="stylesheet" href="/richtexteditor/rte_theme_default.css" /> <script type="text/javascript" src="/richtexteditor/rte.js"></script> <script type="text/javascript" src='/richtexteditor/plugins/all_plugins.js'></script> <div id="div_editor1">You can sets the maximum number of characters including the HTML tags allowed in the RichTextEditor. Default is -1, indicating no maximum.</div> <script> var editor1 = new RichTextEditor("#div_editor1", { maxHTMLLength: 200 }); </script>