Excel to CSV Converter

Convert XLSX or XLS spreadsheets to CSV instantly. Pick any sheet, choose the delimiter, preview the table, then download. Runs 100% in your browser via SheetJS — files never leave your machine.

Click to select or drag & drop an .xlsx/.xls/.ods file here

Preview will appear here after conversion.
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Frequently Asked Questions

Which file formats are supported?

XLSX (Office Open XML), XLS (legacy Excel binary), XLSM (macro-enabled), and ODS (LibreOffice/OpenOffice). All read via the SheetJS library entirely in your browser.

Does it handle multiple sheets?

Yes. After upload, all sheets appear in the "Sheet" dropdown. Pick one, then convert. To export every sheet as a separate CSV, change the sheet and click Convert + Download for each.

Are my files uploaded to a server?

No. All conversion happens in your browser via SheetJS (xlsx). Your spreadsheet never leaves your computer, so it's safe for confidential financial or HR data.

What delimiter should I pick?

Comma is the standard CSV delimiter. Choose semicolon for European locales (where comma is the decimal separator), tab for TSV format, or pipe for systems where commas appear inside fields.