New to Telerik UI for ASP.NET AJAX? Download free 30-day trial

Disable browser spellcheck and curly red underlines in RadEditor content area


Product Version 2019.3.917
Product RadEditor for ASP.NET AJAX


The misspelled words in the editor's content area get automatically highlighted with curly red underlines.


The curly red underline is a result of the browser spellchecker that can be disabled by using the spellcheck attribute.

We need to set the spellcheck attribute with a false value to the content area of RadEditor:

<telerik:RadEditor runat="server" ID="RadEditor1" OnClientLoad="OnClientLoad"></telerik:RadEditor>
    function OnClientLoad(sender, args) {
        sender.get_contentArea().setAttribute("spellcheck", "false");
In this article