The Export to PDF feature of RadEditor cannot be applied when editing full HTML - thus the content cannot contain <html>, <head>, <body> tags. This is a limitation of the ExportToPdf third party tool that RadEditor uses to export its content to PDF.
Note that the content that you export from RadEditor should be a valid XHTML (it doesn't matter whether the XHTML standard is Strict or Transitional)
. If it is not, you will receive an exception that the export cannot be completed: screenshot
You can check the markup using the built-in W3C validator dialog of RadEditor or at http://validator.w3.org/check
. Make sure that the ConvertToXhtml and PdfExportFilter content filters are enabled, e.g.
<telerik:RadEditor id="RadEditor1" ContentFilters="DefaultFilters,PdfExportFilter"
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