XLSX to XLS

Convert XLSX to XLS free in your browser. Turn modern Excel spreadsheets (.xlsx) into legacy .xls files for older Microsoft Excel versions or compatible spreadsheet apps.

Drag your file here or Choose file

Supported format: XLSX (modern Excel)

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How to convert XLSX to XLS

Select or drag your .xlsx file onto the upload area.
Click «Convert XLSX to XLS» and wait while the legacy-format file is generated.
Download the resulting .xls file and open it in Excel, LibreOffice Calc, or another compatible spreadsheet app.

What is it for?

Converting XLSX to XLS lets you share spreadsheets with teams or clients still using older Excel versions that don't open the modern .xlsx format.

Turn Excel XLSX to XLS free in the browser when you need to import data into legacy software, ERP systems, or tools that only accept the binary .xls format.

Conversion runs on your device—the file is not uploaded to external servers, which makes it easier to transform spreadsheets with sensitive data with peace of mind.

Frequently asked questions

Can I convert XLSX to XLS free without installing anything?

Yes. FORMARTIO reads your .xlsx file and generates an .xls directly in your browser. You don't need Microsoft Excel or an account.

Are formulas and formatting preserved during conversion?

The tool converts sheet data to .xls format. Complex formulas, macros, embedded charts, or advanced formatting may not transfer exactly to the legacy format.

Why would I need to convert from XLSX to XLS?

.xlsx is the current Excel standard (since Office 2007), but some older programs, macros, or enterprise systems only accept the binary .xls format from earlier versions.