File & internet

XLSX to CSV

Convert the first worksheet in an Excel workbook into CSV locally. Nothing you enter leaves your browser.

Choose an XLSX workbook

The selected file is processed only in this browser. No upload is made.

Result

Your result will appear here.

Simple by design

Get the answer, without the clutter.

FormatCalc is built for quick work. This xlsx to csv runs entirely on your device, so private text and data stay private.

01

Choose a file or paste its Base64 data.

02

Transform it with one click.

03

Copy, use, or download your result.

Common questions

Using the XLSX to CSV

Is the XLSX to CSV free to use?

Yes. FormatCalc's XLSX to CSV is free to use with no account required.

Is my data private when I use the XLSX to CSV?

Yes. This tool processes your input locally in your browser. FormatCalc does not upload or store what you enter.

How do I use the XLSX to CSV?

Choose or paste your file data, then choose Convert to CSV. The conversion stays on your device.