Shameless plug: we are working on a javascript solution. XLSX/XLSM/XLSB reader/writer: https://github.com/SheetJS/js-xlsx https://github.com/SheetJS/js-xlsx X

Shameless plug: we are working on a javascript solution. XLSX/XLSM/XLSB reader/writer: https://github.com/SheetJS/js-xlsx https://github.com/SheetJS/js-xlsx XLS(BIFF8)/XML(2003-4) reader: https://github.com/SheetJS/js-xls https://github.com/SheetJS/js-xls In-browser reader demo: http://oss.sheetjs.com/ http://oss.sheetjs.com/ In-browser writer demo: http://tokuhirom.github.io/js-xlsx-demo/ http://tokuhirom.github.io/js-xlsx-demo/ -- Some other alternatives: Python xlrd https://github.com/python-excel/xlrd https://github.com/python-excel/xlrd , xlwt https://github.com/python-excel/xlwt https://github.com/python-excel/xlwt , XlsxWriter https://github.com/jmcnamara/XlsxWriter https://github.com/jmcnamara/XlsxWriter Java POI https://poi.apache.org/ https://poi.apache.org/