How to convert XLS to XLSX
To convert XLS to XLSX, upload your XLS 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 XLS 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 XLS file is deleted automatically about 30 minutes after the conversion.
What you get with XLS 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
- Sheets, cell formatting, number formats and charts are carried over. Formulas are kept where the target format supports them.
XLS vs XLSX
| Property | XLS | XLSX |
|---|---|---|
| Full name | Excel 97-2003 Workbook | Office Open XML Spreadsheet |
| Released | 1997, Microsoft | 2007, Microsoft (ECMA-376) |
| Family | Spreadsheet | Spreadsheet |
| Opens in | Microsoft Excel (all versions), LibreOffice and Google Sheets | Microsoft Excel, Google Sheets, LibreOffice Calc, Numbers |
| Best for | old Excel versions; legacy business software | budgets and financial models; reports with several sheets |
Steps to convert XLS to XLSX
- Drop your XLS 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 XLS to XLSX?
Drop your XLS 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 XLS 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 XLS to XLSX?
Sheets, cell formatting, number formats and charts are carried over. Formulas are kept where the target format supports them.
Will formulas and formatting be kept when converting XLS to XLSX?
Sheets, cell formatting, number formats and charts are carried over. Formulas are kept where the target format supports them.
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.