Custom Canonical Plugin
The Custom Canonical plugin for Joomla is a simple way of creating canonical URLs in the Joomla CMS.
This plugin adds a canonical link attribute or parameter directly to the item. This allows the canonical link to valid anywhere the item is displayed.
Remove Default Canonical
Joomla often sets incorrect canonical URLs. You have the option of removing those.
Custom Canonical automatically appends pagination query strings to the end of the custom canonical URL on paginated results.
Custom Canonical Tags
You have the power to set the canonical tag to whatever you desire. This includes a different page on your site or an external site.
Item Based Canonicals
All canonical tags are item based. This means that (unlike some canonical solutions) they are URL agnostic. i.e. it is a real solution.
Place canonical links on...
The Custom Canonical plugin is very easy and simple to use, but there is documentation anyway.