File & internet

CSV to XLSX

Create a downloadable Excel workbook from CSV without uploading it. Nothing you enter leaves your browser.

Paste CSV

Your content is converted locally and prepared as a download.

Result

Your result will appear here.

Simple by design

Get the answer, without the clutter.

FormatCalc is built for quick work. This csv to xlsx 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 CSV to XLSX

Is the CSV to XLSX free to use?

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

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

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

How do I use the CSV to XLSX?

Choose or paste your file data, then choose Create XLSX. The conversion stays on your device.