Unfortunately, it is not possible to transfer the response data to PDF format using FormsCentral.
As a workaround, you may distribute the form as PDF attachment and have the users sent it back to you after completion.
Select the form- Distribute- PDF form- Download- Send it as pdf attachment
Note:- If you want to check the responses in FormsCentral, please check- Add submit button
Please let us know if this answers your question, we will be glad to assist you further