You can use the AdvRichEditor.ClipboardFormat property to control what clipboard formats are accepted for TAdvRichEditor. The ClipboardFormat is a set of possible values: TClipboardFormat = (cfRTE, cfRTF, cfText, cfHTML, cfBMP, cfFile); To accept only plain text for example to paste in TAdvRichEditor, use: AdvRichEditor.ClipboardFormat := [cfText];