Which sheet gets converted?

The first sheet in the workbook. To convert another sheet, move it to the front in Excel and re-run the tool.

What happens to formulas?

They are exported as their last-calculated values, since CSV has no concept of formulas.

Will my data be uploaded?

No. Parsing and conversion happen entirely in your browser — the file never leaves your device.

Convert Excel (XLSX) to CSV

Convert an Excel .xlsx workbook into plain CSV — read locally in your browser with SheetJS, nothing uploaded.

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Why convert XLSX to CSV?

CSV is smaller, opens anywhere, and is the format most databases, scripts, and import tools expect. It strips Excel-specific formatting down to raw data.

How the conversion works

Convertur reads the first worksheet of your workbook and serialises its cells to CSV, escaping commas and quotes as needed — all in the browser.

Quality & compatibility notes

Formulas are exported as their computed values. Only the first sheet is converted; save additional sheets separately if you need them.

How to xlsx to csv

Drop a .xlsx (or legacy .xls) file into the zone above.
Press Convert to read the workbook locally in your browser.
Preview the CSV, then download it.

Related converters

CSV to XLSXTurn a plain CSV into a native Excel workbook.XLSX to JSONTurn a spreadsheet into a JSON array of rows.CSV to JSONTurn spreadsheet rows into a clean JSON array.JSON to CSVTurn JSON data into a spreadsheet-ready CSV.