Convert XLS to XLSX

Free XLS to XLSX Converter

Muaz Muaz Patrick Csaba Kissi Venelin K
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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

Convert to XLSX

Convert other formats to XLSX

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

Frequently Asked Questions

What is a XLS converter?

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.

How do I convert XLS to XLSX ?

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.

Is the XLS converter free?

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.

What's the maximum file size for XLS conversion?

Free users can convert XLS files up to 100MB. Premium users enjoy increased file size limits and additional features like batch conversion.