CSV to XLSX Converter

How to convert CSV to XLSX

  1. Drop or select a .csv file(s).
  2. The tool convert CSV to XLSX locally using your browser — no server upload.
  3. Download the converted .xlsx file instantly.

Why convert locally?

Your .csv files are processed entirely in browser memory. Nothing is sent to a server, stored in a database, or retained after you close the tab. This makes local conversion ideal for sensitive data, proprietary configs, and private media.

Frequently asked questions

Is this CSV to XLSX converter free?

Yes. Every tool on convert.logicapplabs.com is free to use with no account required.

Are my files uploaded to a server?

No. All conversions run 100% client-side in your browser. Your files never leave your device.

What file size limits apply?

Limits depend on your browser and device memory. For very large files or batch jobs, consider ConvertLogic Pro for offline batch processing.

Related tools