XLS → XLSX

Convert legacy XLS files into modern XLSX format. Fast, secure, and easy-to-use XLS → XLSX tool.

Convert

About this tool

The XLS → XLSX converter allows you to upgrade old Microsoft Excel 97-2003 spreadsheets (.xls) to the modern Excel Open XML format (.xlsx). XLSX provides better performance, compatibility, and advanced features that are not available in the legacy format.

How to use:

1. Upload your .xls file using the upload form above.
2. Click on Convert to begin the transformation.
3. The tool processes and converts the file into .xlsx.
4. Download the new Excel file and open it in any modern Excel-compatible software.

Features:

• Converts legacy Excel XLS files to modern XLSX format
• Preserves formulas, tables, and formatting
• Improves compatibility with current Excel and other spreadsheet tools
• Fast and secure online conversion
• No software installation required

Notes:

• Input format supported: .xls
• Output format: .xlsx
• Extremely old XLS files may have limited formatting compatibility
• Converted XLSX files are fully editable