https://cloudconvert.com/doc-to-rtf
DOC to RTF | CloudConvert
doc to rtfcloudconvert
https://docconverter.pro/
Batch convert your Word & PDF documents to HTML, DOCX, PDF, RTF, ODT, TXT - Doc Converter Pro Online
Batch convert and process HTML, DOCX, DOC, PDF, ODF, RTF, TXT documents online or via REST API