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Drop one NUMBERS or two hundred. Batch conversion is not a paid feature here.
Convert NUMBERS to XLSX
Someone on a Mac sent a .numbers file to a Windows colleague, and Excel will not open it at all.
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What actually changes
NUMBERS and XLSX are not the same picture in two wrappers.
The Numbers document is unpacked and its tables written as Excel worksheets, with formulas mapped where an equivalent function exists.
Worth knowing first
Numbers puts multiple independent tables on one canvas sheet; Excel has one grid per sheet. Each table has to be placed somewhere in that grid, so the arrangement changes and any layout that relied on floating tables side by side is rebuilt rather than preserved.
Questions
NUMBERS to XLSX, answered
Why can Excel not open .numbers?
It is an Apple bundle format with no published specification and no Excel importer.
Do the charts convert?
Basic chart types do. Numbers-specific styling and interactive charts do not.
How to convert NUMBERS to XLSX
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Choose your settings
Excel Workbook is lossless, so nothing is thrown away in the conversion.
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Download
Converted and deleted the moment it finishes. Never written to permanent storage.