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Confluence user macros are very helpful scripts you use on your server or data center instances.
If you run your own Confluence instance (Server or Data Center) you can create custom “User Macros”, little scripts that can be included in pages creating content on the fly. With those macros you can create simple HTML code snippets as well as utilize Velocity code accessing information from your Confluence database.
Along my work as a Confluence administrator I ran into several situations where native Confluence Server features did not offer what admins or users needed. Plugins were not available either or too expensive for the purpose. In many of those cases I found that a user macro was just the right solution to the challenge. The Confluence user community helped me a lot writing them. Here are my most useful ones as my contribution back to that community.
This Confluence user macro adds a Bootstrap 3 styled button, supporting different colors and sizes, and linking to a URL.
This Confluence user macro adds an HTML telephone link to your page.
This Confluence user macro displays a link to the Tiny URL of the current page.