Hi,
I am a representative of Aspose.Cells product, the component does support XLS/Xlsx - to - HTML conversion, also it supports to create, manage, manipulate or even convert to all MS Excel (97-2010) file formats, e.g XLS, XLSX, XLSM, XLSB, XLST, CSV, ODS, Tab delimited, SpreadsheetML(2003), PDF etc. See the sample code below using Aspose.Cells APIs:
Workbook wb = new Workbook(“e:\test\book1.xls”);
wb.Save(“e:\test2\outBook1.html”, SaveFormat.Html);
Also, see the documents for complete reference:
For other conversions my fellow colleagues from Aspose.Words and Aspose.Slides teams will reply you here soon.
Thank you.