How do I convert Excel 97–2003 (XLS) to Excel (XLSX)?

Upload your Excel 97–2003 (XLS) file using the box above, confirm Excel (XLSX) as the output format, then select Convert. The converted file is ready to download as soon as processing finishes — usually in a few seconds.

Is converting XLS to XLSX free?

Yes, and there is nothing to sign up for. Every conversion is free, there is no paid tier, and the limits are the same for everyone.

Will the quality change when converting to Excel (XLSX)?

XLSX uses lossy compression, so some data is discarded to keep the file small. The default quality setting is tuned to be visually or audibly transparent for most material, and you can raise it in the conversion settings.

What happens to my file afterwards?

The uploaded file is deleted as soon as the conversion completes, and the converted file is removed automatically once its retention window ends. Download links are signed and expire within minutes.

xlsxlsx

Convert Excel 97–2003 (XLS) to Excel (XLSX)

Free online converter for Excel 97–2003 (XLS) files. Office Open XML workbook. Nothing to install, no watermark, and every file is deleted automatically.

Drag and drop your files

Upload a Excel 97–2003 (XLS) file to convert it to Excel (XLSX). Up to 200 files at once, 10 GB each.

Free · up to 200 files · 10 GB each · files deleted automatically after 168 hours.

About XLS and XLSX

Excel 97–2003 (XLS)

Legacy binary workbook.

application/vnd.ms-excel

Excel (XLSX)

Office Open XML workbook.

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Other Excel 97–2003 (XLS) conversions

xls to pdf
xls to ods
xls to csv

Other ways to get Excel (XLSX)

csv to xlsx
json to xlsx
ods to xlsx