Free XLS to XLSX Converter
All file transfers are encrypted using industry-standard SSL/TLS encryption
Files are stored in secure, isolated cloud storage using Cloudflare R2
Free user files are automatically deleted after 24 hours
Registered users have full control over their file storage and deletion
We never access your files except for automated conversion processing
Convert XLS files to different formats
Convert other formats to XLSX
Upload your XLS file
Wait for the conversion to complete
Download your converted XLSX file
Access to modern Excel features
Better file compression
Improved compatibility
Free and easy to use
A XLS converter is an online tool that transforms XLS files to XLSX format . Our XLS converter maintains file quality while ensuring fast and secure conversion.
Converting XLS to XLSX is simple: Upload your XLS file, select XLSX as the output format, and click convert. Your file will be ready for download in seconds.
Yes, our XLS converter is completely free to use. You can convert XLS files without any cost or registration. Premium features are available for users who need batch processing or larger files.
Free users can convert XLS files up to 100MB. Premium users enjoy increased file size limits and additional features like batch conversion.