Here are the most reliable current workflows:
This is the focus of our article. These are cloud-based servers that take your uploaded RFA, run a conversion engine (often a headless version of Revit or a third-party SDK), and return a DWG. Rfa To Dwg Online Convert
This is technically not an "online converter," but it is the method, and it's free. Here are the most reliable current workflows: This
Most free tools have a size limit (typically 10MB to 50MB). If your family is large, you may need a paid subscription. " but it is the method
Several web-based platforms allow you to upload RFA files and download converted DWG files. Reputable sites like Convertio and Online-Convert offer simple "drag and drop" interfaces that work across all operating systems.