XLSX → XLS

Convert XLSX files back to XLS if needed. Fast, secure, and easy-to-use XLSX → XLS tool.

Convert

About this tool

The XLSX → XLS converter lets you downgrade modern Excel files (.xlsx) to the legacy Excel 97-2003 format (.xls). This is useful when sharing files with users who still rely on older versions of Microsoft Excel or legacy software that does not support the XLSX format.

How to use:

1. Upload your .xlsx file using the upload form above.
2. Click on Convert to start the process.
3. The file is converted into .xls format.
4. Download and use the legacy Excel file in older applications.

Features:

• Converts modern XLSX files into legacy XLS format
• Ensures compatibility with Excel 97–2003 and similar tools
• Preserves most formulas and formatting
• Fast, simple, and secure online conversion
• No software installation required

Notes:

• Input format supported: .xlsx
• Output format: .xls
• Some advanced XLSX features (tables, charts, pivot models) may be lost when downgraded
• Best for compatibility with older systems