Recalculate and save the workbook
Open the original spreadsheet in its intended application and recalculate before saving as XLSX. The browser converter reads saved results without running formulas. A formula without a saved result stops conversion, but an old saved result can still look plausible. Check the reporting date, relevant inputs and displayed totals yourself.
Select only the intended data
Enter the exact visible worksheet name or use the first visible sheet. A range such as A1:F40 provides a more controlled excerpt than exporting a whole used range. Hidden rows and columns inside that range are included. Hiding a salary or personal-data column is not the same as removing it from a conversion. Hidden worksheets are unavailable.
Fit the table to a document
Use at most 200 rows, 10 columns and 30,000 characters in total. Wider tables switch to landscape A4, but that cannot make an arbitrarily wide dataset readable. Unmerge cells before export and split an overly large table into meaningful ranges. The first row is not automatically treated as a header because it may contain data.
Inspect the editable copy
Check dates, leading zeros, line breaks and totals in the DOCX. Display-formatted values are copied as text, so a cell displayed as 12.3 may not reveal all stored decimal places. There are no formulas, chart objects or live workbook links in the Word copy. Re-export after changing the source spreadsheet; the downloaded document does not update itself.