XLS to XLSX Converter

Convert legacy XLS files to modern XLSX format online for free

Convert XLS to XLSX
Supported formats: XLS • No file size limit
100% Free: Convert unlimited XLS files to XLSX!

XLS to XLSX Converter – Free Online Tool

In today's data-driven world, file formats matter. Our free XLS to XLSX Converter is designed to help you quickly transform files with just a few clicks. Whether you're a developer handling APIs, a student working on a project, or a business professional preparing data, this tool makes conversion effortless.

What is XLS Format?

XLS is the legacy Excel file format used by Microsoft Excel 97-2003. It's a binary format that stores spreadsheet data including formulas, charts, and formatting. While widely supported, it has size and feature limitations compared to modern formats.

What is XLSX Format?

XLSX is the modern Excel file format introduced in Excel 2007. It uses Open XML standard, offers better compression, larger file size support, improved data recovery, and enhanced security features. It's the current standard for spreadsheet files.

Why Convert XLS to XLSX?

There are many reasons why people need this conversion. From simplifying analytics to improving application compatibility, converting with our tool ensures accuracy, reliability, and speed. XLSX offers better performance, security, and compatibility with modern applications.

Step-by-Step Guide

  1. Upload your XLS file to our converter.
  2. Click the Tukar button.
  3. Download your ready-to-use XLSX file instantly.

This process is fast, secure, and requires no technical expertise.

Features of Our XLS to XLSX Converter

  • ✅ 100% Free to use with unlimited conversions.
  • ✅ Fast processing with instant results.
  • ✅ Secure handling of files with auto-deletion after conversion.
  • ✅ Works on all devices including PC, Mac, Android, and iOS.
  • ✅ No software installation required – fully web-based.
  • ✅ Accurate and reliable conversions every time.

Use Cases

  • Developers: Modernize legacy Excel files for APIs or applications.
  • Students: Update old spreadsheets for compatibility with current software.
  • Businesses: Migrate historical data to modern Excel format.
  • Data Analysts: Ensure compatibility with latest analysis tools.

Frequently Asked Questions (FAQs)

Yes, it's completely free with no hidden fees.

No, this is a 100% online tool.

Yes, our tool preserves structure and data integrity.

Conclusion

Our XLS to XLSX Converter is the simplest, safest, and most efficient way to handle file conversions online. Stop wasting time with complex manual processes – try it now, upload your file, and get your converted version instantly!