Convert XLS to XLSX

Free XLS to XLSX Converter

Muaz Muaz Patrick Csaba Kissi Venelin K
★ ★ ★ ★ ★
Trusted by 100+ users daily
Select File
Choose Format
Convert

How We Protect Your Files

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

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