Convert CSV to Excel online — free, no upload

Turn a plain CSV file into a real, native .xlsx workbook that opens cleanly in Excel, Google Sheets, or LibreOffice.

The conversion runs entirely in your browser using SheetJS — your data is never uploaded.

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Frequently asked questions

Is the output a real .xlsx file, or a workaround format?

A real, native .xlsx workbook is generated using SheetJS — not a legacy XML trick — so it opens cleanly in modern Excel, Google Sheets, and LibreOffice.

Is my CSV file uploaded to a server?

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

Does this handle commas inside quoted fields correctly?

Yes — CSV parsing uses SheetJS's parser, which correctly handles quoted fields containing commas, line breaks, and escaped quotes.

Can I convert very large CSV files?

Yes, though very large files (tens of thousands of rows) will take longer since everything is processed by your own device.