Convert XLS to XLSX
Free XLS to XLSX Converter
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All file transfers are encrypted using industry-standard SSL/TLS encryption
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Free user files are automatically deleted after 24 hours
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We never access your files except for automated conversion processing
Transform classic Excel spreadsheets to modern XLSX format. Convert XLS files to XLSX format with enhanced features and better compatibility.
How to convert XLS to XLSX
1
Upload your XLS file
2
Wait for the conversion to complete
3
Download your converted XLSX file
Benefits of converting XLS to XLSX
Access to modern Excel features
Better file compression
Improved compatibility
Free and easy to use