XLS to XLSX

Convert old Excel XLS files to the modern XLSX format. XLSX is the default Excel format since 2007 — smaller, more reliable, and better supported.

Upload an XLS file (Excel 97-2003)

The converted XLSX file downloads automatically

Frequently Asked Questions

What is the difference between XLS and XLSX?▼

XLS is the old binary Excel format (pre-2007). XLSX is the modern XML-based format — smaller and more reliable.

Is formatting preserved?▼

Basic formatting (bold, fonts, column widths) is preserved. Complex macros may not transfer.