What happens with multiple sheets?

If your workbook has more than one sheet, a dropdown appears so you can pick which one to export. Only one sheet is converted at a time, matching how CSV itself works — it has no concept of multiple sheets in a single file.

Will formulas and formatting be preserved?

No. CSV is a plain-text, values-only format, so formulas are converted to their last calculated value, and all formatting (colors, bold, column widths, merged cells) is dropped. This is a limitation of the CSV format itself, not something any converter can work around.

Does this support the older .xls format too?

Yes. The underlying library (SheetJS) reads both the modern .xlsx format and the legacy binary .xls format used by older versions of Excel.

Is my spreadsheet uploaded anywhere?

No. The file is parsed and converted entirely in your browser using the SheetJS library — it never leaves your device.

XLSX TO CSV

Convert an Excel workbook to plain CSV, with a sheet picker and live preview. Nothing leaves your browser.

Drop an .xlsx or .xls file here or click to browse

Nothing is uploaded — the workbook is read right in your browser tab.

How to convert XLSX to CSV

1
Drop your .xlsx or .xls file onto the upload area or click to select it.
2
If the workbook has more than one sheet, pick the one you want from the dropdown.
3
Check the preview table to confirm it looks right.
4
Click Download CSV to save the converted file.

Questions

What happens with multiple sheets?: If your workbook has more than one sheet, a dropdown appears so you can pick which one to export. Only one sheet is converted at a time, matching how CSV itself works — it has no concept of multiple sheets in a single file.
Will formulas and formatting be preserved?: No. CSV is a plain-text, values-only format, so formulas are converted to their last calculated value, and all formatting (colors, bold, column widths, merged cells) is dropped. This is a limitation of the CSV format itself, not something any converter can work around.
Does this support the older .xls format too?: Yes. The underlying library (SheetJS) reads both the modern .xlsx format and the legacy binary .xls format used by older versions of Excel.
Is my spreadsheet uploaded anywhere?: No. The file is parsed and converted entirely in your browser using the SheetJS library — it never leaves your device.