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XLS to XLSX Converter
Convert between the old .xls Excel format and the modern .xlsx.
📊Tap to choose an .xls or .xlsx fileor drop it here
Runs entirely in your browser. Files are never uploaded.
How it works
- 1Choose a spreadsheet — the tool detects whether it's the old or new format.
- 2Convert to the other format.
- 3Download the result.
About this tool
Convert an old-style .xls spreadsheet (from Excel 97-2003) into the modern .xlsx format so it opens cleanly in current software, or go the other way if an older program specifically needs the legacy format.
Which direction does this convert?
Both — upload either format and the tool detects it, converting to the other one automatically.
Will formatting and formulas be preserved?
Basic cell data and structure carry over; highly specific legacy formatting may not map perfectly between the two formats.
Is my file uploaded anywhere?
No, conversion happens entirely in your browser.