DDoc80Tools
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XLSX to CSV

Choose a worksheet and export it as CSV.

Local processing
Instructions and limits
  1. Upload an XLSX file and select a worksheet.
  2. Convert to CSV, inspect the preview and download the CSV.

XLSX is limited to 10 MB, 50 MB expanded, and 50,000 rows or 300,000 cells per sheet. Formulas use cached results. CSV formula escaping is on by default and can be disabled for raw values.