1. Settings - Advanced - News - Controls - NewsBackend - Views - NewsBackendInsert(NewsBackendEdit) - Sections - MainSection - Fields - Content
Here are list of RadEditor built-in content filters:
RemoveScripts: this filter removes script tags from the editor content. Disable the filter if you want to insert script tags in the content.
EncodeScripts: this filter encodes all script tags from the content.
MakeUrlsAbsolute: this filter makes all URLs in the editor content absolute (e.g. "http://server/page.html" instead of "page.html"). This filter is DISABLED by default.
FixUlBoldItalic: this filter changes the deprecated u tag to a span with CSS style.
IECleanAnchors: Internet Explorer only - this filter removes the current page url from all anchor(#) links to the same page.
FixEnclosingP: this filter removes a parent paragraph tag if the whole content is inside it.
MozEmStrong: this filter changes b to strong and i to em in Mozilla browsers.
ConvertFontToSpan: this filter changes deprecated font tags to compliant span tags.
OptimizeSpans: this filter changes removes unneeded span elements.
ConvertToXhtml: this filter converts the HTML from the editor content area to XHTML.
IndentHTMLContent: this filter indents the HTML content so it is more readable when you view the code.
ConvertCharactersToEntities: this filter converts reserved characters to their html entity names.
PdfExportFilter: this filter fixes some pdf export issues.
ConvertInlineStylesToAttributes: this filter converts XHTML compliant inline style attributes to Email compliant element attributes.
DefaultFilters: the default editor behavior. All content filters except MakeUrlsAbsolute are activated.