XLS to XLSX Converter

Convert legacy XLS files to modern XLSX format online for free

Convert XLS to XLSX

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Supported formats: XLS • No file size limit

100% Gratuït: 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.

Guia pas a pas

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

Aquest procés és ràpid, segur i no requereix cap experiència tècnica.

Features of Our XLS to XLSX Converter

  • ✅ 100% d'ús gratuït amb conversions il·limitades.
  • Processament ✅ ràpid amb resultats instantanis.
  • Gestió ✅ segura dels fitxers amb supressió automàtica després de la conversió.
  • ✅ Funciona en tots els dispositius, inclosos PC, Mac, Android i iOS.
  • ✅ No es requereix instal·lació de programari – totalment basat en web.
  • Conversions ✅ precises i fiables en tot moment.

Casos d'ús

  • Desenvolupadors Modernize legacy Excel files for APIs or applications.
  • Students: Update old spreadsheets for compatibility with current software.
  • Negocis Migrate historical data to modern Excel format.
  • Analistes de dades: Ensure compatibility with latest analysis tools.

Preguntes freqüents

Sí, és totalment gratuït, sense tarifes ocultes.

No, this is a 100% online tool.

Yes, our tool preserves structure and data integrity.

Conclusió

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!