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XLSX XLS
Free online converter

Convert XLSX to XLS

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XLSX to XLS converterFREE
Drop a .XLSX file here
or pick one - we convert it to .XLS and give you the file to download

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert XLSX to XLS

  1. Add your .XLSX file - drop it in the box above or click to browse.
  2. Convert it to .XLS in a few seconds.
  3. Download your new .XLS file.

What to expect

  • XLS is capped at 65,536 rows and 256 columns - any data beyond those limits is silently cut off on save.
  • Features added after Excel 2003 - sparklines, slicers, newer chart types, and dynamic array formulas like XLOOKUP - are dropped or converted to static values.
  • Keep your original XLSX file as a backup; reverting from XLS may not restore features that were dropped.

Frequently asked questions

Will my formulas still work after converting to XLS?
Standard formulas like SUM, IF, and VLOOKUP carry through fine; newer functions such as XLOOKUP or dynamic array formulas are replaced with their last-calculated static value.
What happens if my spreadsheet has more than 65,536 rows?
Rows beyond 65,536 are silently cut off when saving as XLS - always keep the original XLSX if you need all your data.
Why does Excel show a Compatibility Checker dialog?
Excel scans for features that XLS cannot store and lists each affected item before you save; click Continue to proceed, but review the list first so you know what will change.
Can I convert without Microsoft Excel?
Yes - LibreOffice Calc is free, open-source, and runs on Windows, Mac, and Linux; use File > Save As and select the XLS format.
Learn about the formats: .XLSX · .XLS
Programs that convert XLSX: Microsoft Excel · Corel Quattro Pro · PlanMaker · Word Excel to Htm Html Converter · All File to All File Converter 3000 · Ability Spreadsheet · Microsoft Excel for Mac · iWork Numbers