Next, select the location where you want to save the file. Remember to set the save format as "PDF" . Then select the "Options" button, which is also located in the file save dialog.
Set password for PDF file in Office 2013 Picture 3
The "Options" dialog box will appear, locate and tick the "Encrypt the document with a password" line. Then click OK.
Set password for PDF file in Office 2013 Picture 4
The password settings dialog box will appear. Please enter the password you need to set up in the PDF file and click OK to save.
Set password for PDF file in Office 2013 Picture 5
Back in the Save as dialog box, click "Save" to save the file.
That's it, now try opening the file earlier.
Set password for PDF file in Office 2013 Picture 6
The dialog box asking for a password will appear. Pretty simple, isn't it?
Set password for PDF file in Office 2013 Picture 7