Custom Meta Tags is a powerful Joomla! SEO plugin that you'll be able to define custom metadata for each of your articles with HTML title for the serach engines, you can use the metadata configuration of Joomla! or this plugin, the only difference is that, for example and canonical URL, meta keywords.

The metatag you can define are:

• HTML title, so you can specify a title for the Joomla! article and an HTML title for the serach engines
• meta description, you can use the metadata configuration of Joomla! or this plugin, the only difference is that, for example, if an article is a menu item the native Joomla! system doesn't give that page the article's description
• meta keywords, same story
• canonical URL, useful for duplicated URL and/or content, you can define a unique URL for duplicated pages
• meta generator, you can define a custom generator for each article, or a default generator for every article, or to eliminate the generator metatag, ...

Here you can download Custom Meta Tags Joomla! plugin.

But...how does it works?

Simply type in the editor of your article these (without '*'):

{*metatitle:My HTML title}

{*metadesc:My description metatag}

{*metakeys:my keyword1, my keyword2}

{*metacanonical:www.canonicalurl.com}

For example I've specified the metatitle "Custom meta tags Joomla! plugin" for this page using:

{*metatitle:Custom meta tags Joomla! plugin}