XLS to XLSX Converter

Convert XLS files to XLSX online for free. Upload a XLS file, choose XLSX, and download the converted file with no account required.

Why convert XLS to XLSX?

Document formats differ in editability, layout stability, table support, and sharing compatibility. XLS files are commonly used for legacy spreadsheets and older Excel workbooks. Converting to XLSX helps when your next tool, device, website, or sharing workflow needs modern spreadsheets, tables, and workbook sharing.

Best uses for XLSX

XLSX is useful for modern spreadsheets, tables, and workbook sharing. XLSX is the modern Excel workbook format. Use this output when compatibility, editing needs, upload requirements, or file size make XLSX the better fit.

Before you convert

Check page order, fonts, spacing, tables, links, images, and whether the converted file opens correctly in your target app. Keep the original XLS file until the converted XLSX file has been reviewed successfully.

XLS to XLSX FAQ

How do I convert XLS to XLSX?

Upload your XLS file, keep XLS as the input format, choose XLSX as the output, then start the conversion and download the converted file.

Is this XLS to XLSX converter free?

Yes. You can convert files online without creating an account or installing desktop software.

When should I use XLSX?

XLSX is useful for modern spreadsheets, tables, and workbook sharing. XLSX is the modern Excel workbook format.

Will converting XLS to XLSX change quality?

Quality depends on the source file and output format. XLS is the older Excel format and is often converted to XLSX, CSV, or PDF. XLSX is the modern Excel workbook format.