Merge XLSB To XLTM Online for Free. Free Online XLSB To XLTM Merger. Merge XLSB To Word, Excel, PPTX, PDF, JPG, HTML, ODS, SVG, XPS and more....CSV, OpenOffice, PDF, HTML, image, and many other excel formats...also render Excel files as images, PDF, HTML, ODS, CSV, SVG,...