Upgrade a legacy Excel XLS workbook to the modern XLSX format, breaking the old 65,536-row limit and shrinking the file with ZIP compression. Excel has treated XLSX as its default since 2007; the binary format mostly signals a file nobody has touched in fifteen years.
Convert XLS to XLSX – Free Online XLS to XLSX Converter
Why convert XLS to XLSX?
- Raise the ceiling from 65,536 rows and 256 columns to 1,048,576 rows and 16,384 columns.
- Unlock features that cannot be saved into XLS - XLOOKUP, dynamic arrays, sparklines, slicers.
- Cut corruption risk: zipped XML recovers from file damage far better than the binary BIFF structure.
Tip: VBA macros are the one thing XLSX refuses to store. A macro-enabled workbook needs the XLSM format instead, or the code is stripped in conversion.
How to convert XLS to XLSX
- Upload your XLS file using the area above.
- XLSX is preselected as the target format.
- Click Start and wait for the conversion to finish.
- Download your converted XLSX file.