How to convert CSV to XLSX
To convert CSV to XLSX, upload your CSV file, choose XLSX as the output format and press Convert. The finished XLSX file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter turns CSV spreadsheet files into XLSX in your browser, with no software to install and no watermark. The conversion runs on our server using LibreOffice and pandas, and the result is ready to save to your phone or computer in seconds. Your CSV file is deleted automatically about 30 minutes after the conversion.
What you get with CSV to XLSX
- Holds many sheets, formulas and charts
- Supported by Excel, Google Sheets and LibreOffice
- Compact and reliable
- Opens in: Microsoft Excel, Google Sheets, LibreOffice Calc, Numbers
What to expect from this conversion
- CSV has no formatting, so the spreadsheet is created with plain cells. Numbers and dates are detected automatically.
CSV vs XLSX
| Property | CSV | XLSX |
|---|---|---|
| Full name | Comma-Separated Values | Office Open XML Spreadsheet |
| Released | 1972, IBM and later RFC 4180 | 2007, Microsoft (ECMA-376) |
| Family | Spreadsheet | Spreadsheet |
| Opens in | Excel, Google Sheets, databases, Python, R and every text editor | Microsoft Excel, Google Sheets, LibreOffice Calc, Numbers |
| Best for | importing data into databases and apps; exporting reports | budgets and financial models; reports with several sheets |
Steps to convert CSV to XLSX
- Drop your CSV file onto the converter, or click to choose it.
- Check that XLSX is selected as the target format and adjust the options if you want.
- Press Convert, then save the new XLSX file to your device when it finishes.
Tips for the best result
- Check that the first row contains your column names.
- Use XLSX when you need several sheets.
Frequently asked questions
How do I convert CSV to XLSX?
Drop your CSV file on the converter, confirm that XLSX is the target format and press Convert. When it finishes, press Save to device or download the XLSX file. No account or software is needed.
Is the CSV to XLSX converter free?
Yes. It is free, with no watermark, no sign-up and no limit on how many files you convert. The site is supported by ads.
What should I know before converting CSV to XLSX?
CSV has no formatting, so the spreadsheet is created with plain cells. Numbers and dates are detected automatically.
Will formulas and formatting be kept when converting CSV to XLSX?
CSV has no formatting, so the spreadsheet is created with plain cells. Numbers and dates are detected automatically.
Which programs open XLSX files?
XLSX files open in Microsoft Excel, Google Sheets, LibreOffice Calc, Numbers.
How large a file can I convert?
Up to 100 MB per file. Files are deleted from the server about 30 minutes after conversion, and no one looks at them.