Convert CSV to XLSX
CSV table → Excel spreadsheet (XLSX): convert online for free. CSV to XLSX conversion runs right in your browser — your files never leave your device.
Drop files here or choose them
You can also paste files with Ctrl+V
Files never leave your device
About the formats
- CSV table
- Plain-text table with comma- or semicolon-separated values. Opens in Excel, Google Sheets and any text editor.
- Excel spreadsheet (XLSX)
- Microsoft Excel workbook format with sheets, formulas and formatting. Also opens in Google Sheets, Numbers and LibreOffice.
How to convert CSV to XLSX
- Choose a CSV table file or drag it onto the page.
- Check the settings and click Convert.
- Download the Excel spreadsheet (XLSX) file when it is ready.
Frequently asked questions
Will leading zeros and long numbers stay intact?
Yes. Codes like 007 and numbers longer than 15 digits (card or account numbers) stay as text, while ordinary numbers become real numbers you can calculate with.
Is converting CSV to XLSX free?
Yes. Conversion is free, with no sign-up and no watermarks.
Are my CSV files uploaded anywhere?
No. The conversion runs in your browser, so your files never leave your device.
What data is kept when converting CSV to XLSX?
All cell values and column headers. Formulas are saved as their calculated results; formatting, charts and images are not carried over, since CSV and JSON store data only.