XLS to XLSX
Convert XLS files to XLSX with a focused browser-based tool.
Convert XLS to XLSX online
XLS is a legacy Microsoft Excel workbook format. XLSX is the modern Microsoft Excel spreadsheet format. Converting from XLS to XLSX is useful when you need structured tables, formulas and workbook data, especially for spreadsheet and data-analysis workflows.
How to convert XLS to XLSX
- Choose a XLS file from your device.
- Review any available quality or output settings.
- Start the conversion and download the finished XLSX file.
What to know before converting
Structured-data conversions can change data types, formulas, formatting or nested structures. Check important fields after conversion. This tool is designed to perform supported conversions in the browser, so you can get to the result without installing desktop software.
About XLS and XLSX files
Excel spreadsheet is useful for older spreadsheet files. Excel workbook is useful for structured tables, formulas and workbook data. Choosing between them depends on the software you use, the level of compatibility you need, and whether file size, editability, quality or transparency matters for your workflow.