The code you submit is not stored in any form. Therefore, please report errors.
For larger conversions please use the Code Converter Extension for Visual Studio, which uses full project context to significantly improve conversion. It runs completely locally without calling this REST API.
The code for this Web site can be found in the Code Converter GitHub repository. The client library for the REST API plus some smaller clients are accessible via the clients repository, which has a downloadable release of the Windows desktop client.
As always, help is appreciated - e.g. converters for other language combinations. Please open an issue when intending to do so.