Yes, this is possible when you have an account (free or paid).

Decimal sign after converting Excel to PDF

Note. You also need this setting when you have dates in your Excel

1) Login at PDFen.com

2) Go to  "My preferences"

3) Choose the deisred dateformat

Go to preferences

 

Set decimal sign for PDF after converting Excel file

After save you should see the right decimal sign after converting Excel (spreadsheet) files (xls, xlsx or ods)