Home › Spreadsheet converter › CSV converter
CSV to XLSX Converter
Convert CSV files to XLSX in seconds, free and unlimited.
🔒 Files are processed on your device. Nothing is uploaded.
How to convert CSV to XLSX
- Click Choose files or drop your CSV files into the box. You can add several at once.
- Make sure XLSX is selected as the output format.
- Press Convert, then download your XLSX files.
CSV
Comma-separated values: plain-text tables accepted by every spreadsheet and database.
XLSX
Microsoft Excel workbook, the default spreadsheet format since Office 2007.
Spreadsheets are converted with SheetJS. Formulas are kept as their calculated values; formats with a single table (CSV, HTML) export the first sheet.
Other CSV conversions
Convert other files to XLSX
FAQ
Is converting CSV to XLSX free?
Yes. Unlimited conversions, no sign-up, no watermark.
Are my files uploaded to a server?
No. FieldConvert processes files inside your browser, so your CSV files never leave your device. That makes it private and fast, because there is no upload or download wait.
Is there a file size limit?
Only your device's memory. Files up to about 2 GB work in most desktop browsers.