CSV to XLSX

Convert CSV into a downloadable Excel .xlsx workbook.

How to use CSV to XLSX

  1. Paste your CSV data or load a file.
  2. Click Convert to XLSX.
  3. Your .xlsx file downloads automatically.

Build Excel files in the browser

This tool turns CSV into a real .xlsx workbook using SheetJS, all locally — your data is never uploaded.

Does it create a real .xlsx file?
Yes, a standard Excel workbook that opens in Excel, Google Sheets and LibreOffice.
Are my files uploaded?
No. Everything is processed locally in your browser, so your files never leave your device.

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