Convert ACCDE to XLS

You actually cannot convert MS Access .accde files to anything else, not even recover the original database, or just export the data to an Excel spreadsheet (.xls), which would be the case of accde to xls conversion.

ACCDE format is designed to be view only executable that allow users to access and view the database, but not edit it. There is really no way how to reverse the process unless you have access to the original database.

Simply put, it is impossible to convert ACCDE to XLS directly.
Thus, there is no so-called accde to xls converter or a free online .accde to .xls converter to be found.