Convert XLS to XLSX
Microsoft Excel 97-2003 Spreadsheet → Microsoft Excel Spreadsheet
Why Convert This process?
XLSX is the modern Excel format with better features and smaller files. Convert old XLS files for compatibility with current Excel.
Best Online XLS to XLSX Converters
Free online converters work in your browser with no software installation required:
- CloudConvert - Fast and reliable converter
- Zamzar - Fast and reliable converter
- FreeConvert - Fast and reliable converter
- Convertio - Fast and reliable converter
Desktop Software for The conversion
Desktop applications offer more control, faster processing, and work offline:
| Software | Platform | Features | Price |
|---|---|---|---|
| Microsoft Excel | Windows/Mac | Best compatibility for XLS/XLSX files | Paid |
| LibreOffice Calc | All platforms | Free alternative with good format support | Free |
| Google Sheets | Web-based | Free web-based spreadsheet editor | Free |
| WPS Spreadsheets | All platforms | Free Excel alternative | Free |
Conversion Tips
- Formulas and formatting are preserved
- XLSX files are smaller than XLS
- Macros need to be saved as XLSM
- Verify complex formulas work after conversion
Step-by-Step Conversion Guide
- Choose your tool: Select an online converter for quick one-time conversions, or install desktop software for batch processing
- Upload your file: Click upload or drag your XLS file into the converter
- Adjust settings: Configure quality, resolution, or other options as needed
- Convert: Click the convert button and wait for processing to complete
- Download: Save your new XLSX file to your device