How to convert XLSX to CSV
- 1. Add your XLSX file
Drag a XLSX file onto the box above, or click to browse. - 2. Choose CSV
CSV is already selected as the output — just confirm. - 3. Convert & download
Hit Convert and your new file is ready to save in a second.
XLSX and CSV explained
XLSX (Excel Spreadsheet): The modern Microsoft Excel spreadsheet format.
CSV (Comma-Separated Values): A plain-text format for spreadsheet and tabular data that opens anywhere.
Frequently asked questions
Is it free to convert XLSX to CSV?
Yes. Converting XLSX to CSV on SwiftConvert is completely free, with no sign-up, no watermark and no limits.
Are my files uploaded to a server?
No. The conversion runs entirely in your browser, so your files never leave your device — nothing is uploaded, which keeps your data private.
Will I lose quality converting XLSX to CSV?
The conversion keeps as much quality as the CSV format allows.
Does it work on Windows, Mac, iPhone and Android?
Yes. It runs in any modern browser on any device — there is nothing to install to convert XLSX to CSV.