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XLSX to XLS Converter
Convert XLSX files to XLS in seconds, free and unlimited.
🔒 Files are processed on your device. Nothing is uploaded.
How to convert XLSX to XLS
- Click Choose files or drop your XLSX files into the box. You can add several at once.
- Make sure XLS is selected as the output format.
- Press Convert, then download your XLS files.
XLSX
Microsoft Excel workbook, the default spreadsheet format since Office 2007.
XLS
Legacy Excel 97–2003 workbook.
Spreadsheets are converted with SheetJS. Formulas are kept as their calculated values; formats with a single table (CSV, HTML) export the first sheet.
Other XLSX conversions
Convert other files to XLS
FAQ
Is converting XLSX to XLS free?
Yes. Unlimited conversions, no sign-up, no watermark.
Are my files uploaded to a server?
No. FieldConvert processes files inside your browser, so your XLSX files never leave your device. That makes it private and fast, because there is no upload or download wait.
Is there a file size limit?
Only your device's memory. Files up to about 2 GB work in most desktop browsers.