FROM XLS → TO XLSX
How to use it
01
Choose a legacy XLS file.
02
Convert its data to XLSX locally.
03
Open the new workbook and verify the values.
FILEMAKT / XLS → XLSX
XLS to XLSX Converter
Convert legacy XLS spreadsheet data to a modern XLSX workbook locally in your browser.
convert XLS to XLSXold Excel to new Excelupgrade XLS file
Start the tool USE CASES
When this tool is useful
Opening an old spreadsheet in modern Excel
Preparing legacy data for a tool that only accepts XLSX
WHY THIS TOOL PAGE
Clear processing within the current file limits.
Direct result download with review before deleting the original.
Internal links to tools that complete the workflow.
FAQ / XLS-TO-XLSX
Frequently asked questions
Are formulas and styling preserved?
The conversion focuses on data values; complex formulas and styling are not guaranteed.
Why convert XLS to XLSX?
Modern Excel and most tools expect XLSX; legacy XLS is harder to open in new software.
Is my spreadsheet uploaded?
No. Conversion runs in your browser.
A focused search-intent page connected to the relevant workflow.