XLS to XLSX

Old XLS spreadsheets are limited to 65,536 rows and are less supported by modern apps. Convert them to XLSX to work with them in current Excel, Google Sheets and on mobile devices.

How to convert XLS to XLSX

1. Upload your XLS file.
2. Click Convert.
3. Download the XLSX file.

XLS to XLSX features

• Keeps all sheets, formulas, number formats and cell styles.
• Opens in Excel, Google Sheets, LibreOffice and Numbers.
• No Microsoft Office needed.

XLS and XLSX compared

XLS is the binary format of Excel 97 to 2003 and is limited to 65,536 rows and 256 columns per sheet. XLSX, the format of Excel 2007 and later, supports 1,048,576 rows and 16,384 columns, stores data as compressed XML and is usually smaller. Google Sheets, Numbers and mobile apps also handle XLSX more reliably, so converting old spreadsheets makes them easier to share and edit.

Frequently asked questions

Are formulas kept?

Yes, formulas are converted and recalculate in the new file.

Are macros kept?

No. XLSX cannot contain macros, so VBA macros are not included.

Why convert to XLSX?

XLSX supports over a million rows, is usually smaller and is the standard format of modern Excel.

Is my data private?

Yes, the file is deleted automatically 60 minutes after processing.

Privacy, limits and file safety

Your documents are processed on our own server, are never shared with anyone and are deleted automatically 60 minutes after processing. Passwords you enter are used once and never stored. Files can be up to 500 MB. No sign-up, no watermark and no software to install: it works in any modern browser on Windows, Mac, Android and iPhone.

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