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.
FILE MAKTAB / XLS → XLSX
XLS to XLSX Converter
Convert legacy XLS spreadsheet data to a modern XLSX workbook locally in your browser.
Get help with this toolABOUT THIS TOOL
Modernize legacy XLS files to XLSX
The old XLS format (pre-2007 Excel) still arrives from legacy systems, archives, and older exports — but modern tools, libraries, and some current software handle XLSX far better. Converting XLS to XLSX makes the data accessible to the current ecosystem.
This tool converts the data of a legacy XLS workbook to XLSX, locally in your browser. Cell values move across; advanced workbook features (macros, exotic formatting, legacy objects) are outside the conversion's scope, so review the new workbook if the original used anything beyond plain data.
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
Legacy data becomes usable in modern spreadsheet tools.
Local conversion — archived business data stays private.
A straightforward one-file workflow with immediate download.
PRACTICAL TIPS
Before you start
- Open the XLSX afterwards and spot-check totals and dates against the original.
- Macros do not transfer; if the workbook relied on them, plan a manual alternative.
- Keep the original XLS archived until you have verified the converted values.
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.