Input and output file formats supported by GroupDocs.Assembly for Node.js via Java: Word, Excel, PowerPoint, email, OpenDocument, PDF, HTML, Markdown and more....Spreadsheet (XLS, XLT, XLSX, XLSM, XLTX, XLTM, XLSB, SpreadsheetML...Spreadsheet (XLS, XLT, XLSX, XLSM, XLTX, XLTM, XLSB, SpreadsheetML...