Who Is This Tool For?
Accountants, financial analysts, and database managers modernizing legacy financial archives.
Good to Know
Preserves formulas, cell formatting, charts, and multiple worksheet tabs.
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Spreadsheets
XLS to XLSX Converter
Upgrade legacy Microsoft Excel 97-2003 spreadsheets (.xls) to modern OpenXML Excel (.xlsx).
Select XLS files or drag them here
Convert to XLSX. Max 50 MB per file.
Encrypted & Private
•
Auto-deleted after 60m
Conversion Queue
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How to Use XLS to XLSX Converter
1
Upload XLS File
Select your legacy .xls spreadsheet.
2
Upgrade Workbook
Migrate binary cell tables to OpenXML spreadsheet structure.
3
Download XLSX
Open in Excel 365, Google Sheets, or Power BI.
XLS to XLSX Converter FAQs
XLSX supports over 1 million rows (compared to 65,536 in XLS), uses smaller file sizes, and works with modern cloud formulas.
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