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HomeXLS vs XLSB
.xls
.xlsb

XLS vs XLSB

Compare Microsoft Excel 97-2003 and Excel Binary Workbook formats — understand the key differences and when to use each

Format Overview

XLS

Microsoft Excel 97-2003

Microsoft Excel 97-2003 (.xls) is a spreadsheet file format.

.xlsspreadsheet

XLSB

Excel Binary Workbook

Excel Binary Workbook (.xlsb) is a spreadsheet file format.

.xlsbspreadsheet

XLS vs XLSB: Feature Comparison

FeatureXLSXLSB
Full NameMicrosoft Excel 97-2003Excel Binary Workbook
File Extension.xls.xlsb
Categoryspreadsheetspreadsheet
Free to Convert✓ Yes✓ Yes
Browser Support✓ All Browsers✓ All Browsers
Convert to Each Other✓ Yes✓ Yes

When to Use XLS vs XLSB

Use XLS when you need:

  • •Files in Microsoft Excel 97-2003 format for maximum compatibility
  • •Industry-standard spreadsheet format support
  • •Wide software and platform compatibility

Use XLSB when you need:

  • •Files in Excel Binary Workbook format for specific workflows
  • •Optimized spreadsheet format features
  • •Modern format advantages and smaller file sizes

Convert Between Them

XLS XLSBXLSB XLS
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Learn More About These Formats

XLS Converter XLSB Converter

Frequently Asked Questions

What is the difference between XLS and XLSB?
XLS (Microsoft Excel 97-2003) and XLSB (Excel Binary Workbook) are both spreadsheet file formats. XLS files use the .xls extension while XLSB uses .xlsb. They differ in compression, quality, compatibility, and intended use cases.
Can I convert XLS to XLSB for free?
Yes! Convert999 lets you convert XLS to XLSB completely free, directly in your browser. No file upload to any server, no registration needed — your files stay private on your device.
Which is better, XLS or XLSB?
It depends on your use case. XLS (Microsoft Excel 97-2003) may be better for certain workflows, while XLSB (Excel Binary Workbook) excels in others. Consider factors like file size, quality, software compatibility, and your specific needs.
Is it safe to convert files on Convert999?
Absolutely. Convert999 processes all files 100% locally in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

XLS Converter

Convert from XLS

XLSB Converter

Convert from XLSB

File Tools

Compress, resize, merge

Convert to XLS

All sources → XLS

Convert to XLSB

All sources → XLSB

Format Statistics

Trends & data 2025

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