You can Convert Google Docs™ to PDF using the Docs to PDF Pro add-on. 

All tabs in the Google Docs are exported as a single PDF. Also,  you can convert Google Docs to PDF without loosing formatting using the Docs to PDF Pro add-on.

You can Bulk convert Google Docs to PDF using the Docs to PDF Pro add-on.

You can merge multiple Google Docs into a single PDF file using the Docs to PDF Pro add-on. 

Additionally, 

- You can convert Word to PDF using the Docs to PDF Pro add-on.

The conversion process takes place within your Google™ account and files are not transmitted to any of our servers for conversion. This ensures the highest levels of privacy and security.

The app requests the least necessary permissions and does not require access to your entire Google Drive™.

Google™, Google Docs™ and  Google Drive™ are trademarks of Google LLC.