Install Diagrams for Confluence from the Atlassian Marketplace. While editing a page, type / and insert Diagram, Board, Excalidraw or Mermaid diagram. Draw in the full-screen editor, press Publish, then publish the page. Apps → Diagrams lists every diagram you can see.
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Before you start
You need to be a Confluence administrator to install the app from the Atlassian Marketplace.
People who can view a page can view its diagrams. People who can edit the page can add and change them. See Permissions.
The draw.io editor and viewer load from diagrams.net, so your network must allow embed.diagrams.net, viewer.diagrams.net and app.diagrams.net.
Install the app
In Confluence, go to Apps → Explore more apps, search for Diagrams for Confluence and install it.
Edit any page and type /diagram to check the macros are there.
As an admin, open Confluence administration → Apps → Diagrams configuration to choose diagram types, AI settings and viewer defaults.