Light

Light does not come with a configuration panel like other similar plugins, but once installed it will automatically highjack any image embedded in a post or page and let users preview it inside a modal window when clicking on it.

Support is included for viewing single images or image sets, and even native WordPress galleries.

The plugin implements the FancyBox jQuery plugin and supports all of its features, including captions.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

Requirements:

• WordPress 3.8 or higher