Spreadsheet formats

What is the XLSB format?

XLSB — Excel Binary Workbook

XLSB is Excel's binary workbook format: the same content as XLSX, but stored in a binary form that opens and saves faster for very large files.

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About the XLSB format

Excel 2007 and later can save workbooks as XLSB. It suits huge spreadsheets with many formulas, but Google Sheets, LibreOffice and most other tools handle it poorly.

Converting to XLSX or CSV makes the data usable everywhere.

Programs that open XLSB

  • Microsoft Excel
  • LibreOffice Calc

What XLSB is used for

  • Very large workbooks
  • Data-heavy reports

Other Spreadsheet formats

All 11 Spreadsheet formats · all supported formats