Convert Documents to PDF via REST API or Workflow Action
It's great that you can convert a document stored in a SharePoint library to PDF by using the item menus, but I would like to automate that capability through a workflow.
What would be awesome is if I could have a Workflow Action to convert the current item to PDF. If not, then at least expose a REST API so that I could use the Call an HTTP Service to create the PDF file.
Please check out: https://www.youtube.com/watch?v=vUoRAxFNxlA
Converting docx to pdf with Flow in Sharepoint Online
Roman Rylov commented
Please check out the following article: Generate PDF file from template using workflow in SharePoint 2013 and Office 365 https://plumsail.com/blog/2014/11/generate-pdf-document-using-workflow-sharepoint-2013-office-365/
Essentially: Adding REST Endpoints to Word Automation Service and also bringing it to SPO would do it!