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Free File Converter

CSV to XLSX Converter

Convert CSV files to Excel XLSX workbooks with proper cell types and headers. Free, runs locally with SheetJS — no upload required.

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About this converter

How CSV to XLSX conversion works

Convert CSV files to Excel XLSX workbooks with proper cell types and headers. Free, runs locally with SheetJS — no upload required.

Drop a CSV file into the workspace above and the converter will produce a XLSX file directly in your browser. Conversion runs locally - your file never leaves your device, no account is required, and there are no upload limits.

  • • Private — processing happens entirely in your browser.
  • • Free — no signup, no watermarks, no daily limits.
  • • Fast — no upload time, no server queues.

Step-by-step Guide

How to convert CSV to XLSX

1

Upload your files

Drag and drop your files into the workspace above or click to select them from your device.

2

Adjust settings (optional)

Configure any specific options or preferences for your conversion or calculation.

3

Download the result

Click the action button and wait for processing to finish, then download your final file.

FAQ

Frequently Asked Questions

Is this tool free to use?

Yes, our tool is completely free with no hidden limits or watermarks.

Are my files secure?

Absolutely. All processing happens right where you are, without sending your files elsewhere.

Does this work on mobile?

Yes, our platform works smoothly on any modern device, including smartphones and tablets.