xls
Excel 97-2003 Workbook
The older binary Excel format, still exported by plenty of business software.
Convert XLS to XLSX
Free, no account, no watermark. Converted on our servers, then deleted.
Drop an XLS file here
As many as you like. We will show you what they convert to.
or paste one from the clipboard
How to convert XLS to XLSX
- 1
Choose your file
Drop an XLS file onto the converter, or pick one from your device. You can add several at once.
- 2
Select XLSX
Pick XLSX as the output format. There is nothing to configure: the file is wrapped as it is.
- 3
Download the result
Convert and download the finished file. No account, and nothing to install.
xlsx
Excel Workbook
Microsoft Excel’s format since 2007: sheets, formulas and formatting in one file.
XLS to XLSX, asked and answered
Does converting XLS to XLSX lose quality?
No. Both store the data exactly, so the result is the same content in a different container.
Can I convert the XLSX back to XLS?
Yes. Both formats store the data exactly, so converting back gives you the same content again.
Where does the conversion happen?
On our server. The file is sent over HTTPS and converted in a sandbox with no network access of its own; your input and the result go together, removed at once if it fails and otherwise kept for a few minutes so you can download them, then deleted — whether or not you did. There are no accounts for anything to be kept against.
Is there a limit on file size?
Yes — there is a per-file cap and an hourly job limit, because this runs on one small server. The API page states the limits currently in force rather than a number baked into this page.