XLSX → XLS

Convert XLSX files back to XLS format quickly and securely.

Batch Processing: Convert multiple XLSX files at once.

About this tool

The XLSX → XLS converter allows downgrading modern Excel spreadsheets (.xlsx) to legacy Excel 97-2003 format (.xls). Useful for sharing files with older Excel versions.

How to use:

Upload your .xlsx file using the upload area above.
Click Convert to begin the process.
Wait while the file is converted to .xls format.
Download and use the XLS file in older Excel or compatible 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