Convert Excel to CSV online — free, no upload

Turn a real .xlsx or .xls spreadsheet into a plain CSV file for import into another system, a script, or a database — without uploading it anywhere.

Parsing runs entirely in your browser using SheetJS, a widely-used open-source spreadsheet library.

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Frequently asked questions

Does this handle multi-sheet workbooks?

Yes — if your workbook has more than one sheet, you can preview and download the CSV for each sheet individually.

Is my spreadsheet uploaded to a server?

No. The conversion runs entirely inside your browser. Your spreadsheet is never sent over the network — see our How It Works page for the technical details.

Will formulas be converted too?

Formulas are converted to their last calculated values, since CSV is a plain-text format with no support for formulas.

Does this work with the older .xls format too?

Yes — both the modern .xlsx format and the legacy .xls format are supported.