Clean CSV & Excel

Drop a spreadsheet

CSV · Excel · TSV · stays on your device

Turn a CSV into a proper Excel .xlsx workbook, right in your browser. Drop the CSV in, optionally tidy it, and download a real .xlsx that opens cleanly in Excel, Google Sheets or Numbers — with the UTF-8 encoding and quoting handled for you. Nothing is uploaded.

Better than renaming a .csv to .xlsx (which does not actually make a valid workbook).

How to convert csv to excel

  1. Drop your CSV file.
  2. Choose "Save as Excel (.xlsx)".
  3. Download the Excel workbook.

Frequently asked questions

Is this a real Excel file?

Yes — it writes a genuine .xlsx workbook, not a renamed CSV, so Excel opens it without warnings.

Will accented characters survive?

Yes. Encoding is handled properly, so special characters come through correctly.

Is my file uploaded?

No. The conversion happens on your device.

Related tools

Excel to CSV — convert XLSX to CSV free | jomijo Clean CSV CSV to JSON