We have found 4 software records in our database eligible for .xlsx to .xlsb file format conversion.
Both .xlsx to .xlsb files are from Microsoft Excel, which means the easiest way to achieve xlsx to xlsb conversion is to use the program. The reason for this is to create binary workbooks that are much faster to load.
You can create a .xlsb workbook from existing .xlsx spreadsheet in Microsoft Excel with the File ► Save as... function.
XLSX
Files with xlsx extension are s used by Microsoft Excel for its workbooks (spreadsheets) in Office Open XML format. XLSX is the latest spreadsheet format used by Excel with the adoption of XML formatting first used in Office 2007. While older xls files were in proprietary binary file format, xlsx spreadsheets use a somewhat altered XML scheme.
XLSB
Files with xlsb extension is used by Microsoft Excel spreadsheet editor distributed with the Microsoft Office. An xlsb file contains Excel workbook stored in a binary file format (BIFF12). The BIFF12 binary format is used for data that can not be stored in the Open XML text format.