DOC is a document format: it stores formatted text in a binary compound-document structure, requiring Microsoft Word or a compatible reader to render correctly. KEY is a document format that stores data in the KEY format. This conversion changes the file's encoding, compression method, and supported feature set. Text content, headings, and basic formatting are transferred; complex features such as macros or embedded objects may not translate fully. Converting between these two formats is common when the source application does not support KEY natively or when the target platform only accepts KEY. 1converter processes this conversion server-side using open-source tools. Files are transferred over HTTPS, converted on secure cloud servers, and automatically deleted after 24 hours.