Add your CSV file, click Convert to XLSX, and download the XLSX result. The whole process happens in your browser and takes just a few seconds.

Yes. This CSV to XLSX converter is completely free with no sign-up, no watermarks and no limit on the number of files you can convert.

No. Conversion runs entirely on your device using your browser, so your files never leave your computer or phone.

No. XLSX is a lossless format, so the conversion preserves the full quality of your original CSV.

Yes. Add as many CSV files as you like and convert them in a single batch, then download each XLSX result.