Since RFA is a native Revit format, the most reliable way to convert it is through the software itself. Open the RFA file Autodesk Revit Switch to the desired view for a 3D model or a Plan/Elevation view for a 2D CAD file. Navigate to File > Export > CAD Formats > DWG
You get a DWG file containing the 2D representation of your RFA object. Rfa To Dwg Online Convert
Some BIM-focused online toolkits offer conversion. (desktop, but free) offers an online portal for viewing and exporting. Glodon also offers cloud-based interoperability tools. Since RFA is a native Revit format, the