
All the actions and appearances you have available with links are also available when creating buttons. One major distinction between links and buttons are the choices you have for creating appearances.
When you create a link, Nitro PDF Professional presumes you have content on a page giving the user some sort of indication for what the link action will do. For example, you might create a link over text, over an image or icon, or some other content. Links traditionally are not created in open white spaces on a page because the user has no clue as to what the link action will do.
If you have an open area in a document and you want to create a link, using the button tool is a better choice. Whereas link appearances are restricted to the attributes assigned to the link rectangle, buttons can be created with text inside the button rectangle, with an icon appearing inside the button rectangle, or both. This option is not available with links.

Note: To use the align tools you must select at least two links.