100% in your browser · data never leaves your device

Excel (XLSX) to CSV Converter — Free & Private (In-Browser)

Convert an .xlsx or .xls file to CSV in your browser, reading the first sheet locally. No upload, no signup. Free and unlimited.

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How to use Excel to CSV

  1. 1Paste your input into the box, or upload a file.
  2. 2Adjust any options shown above the output.
  3. 3The Excel to CSV runs locally in your browser as you type.
  4. 4Copy the result, or download it as a file.

Excel to CSV FAQ

Are my spreadsheets uploaded?
No. The file is parsed in your browser via SheetJS; the rows never leave your device.