pdf24.org provides two different Wordpress PDF plugins. The normal Wordpress PDF plugin
is the most used PDF
plugin from pdf24.org. With this plugin a visitor can export an article to PDF. The installation is very easy with the Wordpress plugin manager. Underneath each article a small box is displayed, with which a visitor can create the PDF.
More about Normal Wordpress PDF plugin
The second plugin, the Wordpress PDF sidebar plugin
displays a small box in the sidebar. An email address can be entered.
This plugin exports all articles on the currently shown page. The
installation is easy too.
More about Wordpress PDF sidebar plugin