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Convert XLSB to XLS

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Verified by Adam B.· reviewed by FE Editorial ·updated Aug 5, 2026
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Is it possible to convert XLSB to XLS?
Yes - XLSB converts to XLS.

You can do it right here with our free converter - no sign-up, and your file is deleted right after.

The fastest path is Excel's Save As: open the file, choose File > Save As, and pick Excel 97-2003 Workbook (*.xls). The critical caveat is that XLS caps each sheet at 65,536 rows - any data beyond that limit is silently dropped during conversion.

4 programs
Also to XLS: WDB · ACCDR · XLR

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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XLSB → XLS converterFREE
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Why convert XLSB to XLS?

People convert XLSB to .XLS mainly for backward compatibility with legacy software, old ERP systems, or recipients whose tools accept only the Excel 97-2003 format. Some data import routines and older macros are hard-coded to expect .xls as input.

How to convert XLSB to XLS

Microsoft Excel - Save As PAID

Open the XLSB in Excel, go to File > Save As, and choose Excel 97-2003 Workbook (*.xls); review the Compatibility Checker warnings before saving.

LibreOffice Calc - Save As FREE

Open the XLSB in LibreOffice Calc, go to File > Save As, and select Microsoft Excel 97-2003 (*.xls).

Command line - LibreOffice CLI

Convert in one command: libreoffice --headless --convert-to xls file.xlsb

Programs that convert XLSB

Microsoft Excel
Microsoft Excel for Mac
LibreOffice Calc
OpenOffice.org Calc

About these formats

.XLSB Microsoft Excel Binary Workbook

An XLSB file is a Microsoft Excel workbook saved in binary format instead of the usual XLSX. It holds the same spreadsheets and can contain macros, but opens and saves faster for large…

Open .XLSB details →
.XLS Microsoft Excel 97-2003 Workbook (Binary Interchange File Format, BIFF8)

An XLS file is an old-format Microsoft Excel spreadsheet from the Excel 97-2003 era, saved as a binary file rather than the ZIP-based XLSX used since 2007. You can open it free without…

Open .XLS details →

Quality & what to watch

  • XLS caps each sheet at 65,536 rows - data beyond that limit is silently dropped; check your row count before converting.
  • Features added after Excel 2003 - sparklines, slicers, newer chart types - may be removed or converted to static objects.
  • The resulting XLS file may be larger than the original XLSB because the older BIFF8 format is less compact.

Frequently asked questions

Do I lose macros when converting XLSB to XLS?
No - both formats support VBA macros, so any macros carry over intact. Converting to XLSX would drop them.
What happens if my workbook has more than 65,536 rows?
Rows beyond 65,536 on any sheet are silently lost. If your data exceeds that limit, convert to XLSX instead, which shares XLSB's 1,048,576-row capacity.
Why does Excel show a Compatibility Checker warning?
It lists workbook features that XLS cannot store, such as newer chart types or slicers. Review the list and decide whether to accept the downgrade or keep the XLSB.
Can I convert XLSB to XLS without Microsoft Excel?
Yes - LibreOffice Calc is a free, open-source alternative that handles most workbooks accurately.