Merge SPREADSHEETML to XLS Online for Free. Free Online SPREADSHEETML to XLS Merger. Merge SPREADSHEETML to Word, Excel, PPTX, PDF, JPG, HTML, ODS, SVG, XPS and more....Open NuGet package manager, search for and install. You may also... HTML, ODS, CSV, SVG, JSON, WORD, PPT and more, thus making it...