Is it illegal to copy and paste an invitation onto Microsoft Word if the invitation isn't meant to be free?

If you copy and paste an invitation onto Microsoft Word that isn’t meant to be free is it illegal? Because I found this website and you get to customize invitations and then they send it to you (for money). But I just created it and copy and pasted it onto Microsoft Word and printed it out. If I send them out would that be illegal or can I do that?