WP Supersized is a free WordPress plugin that enables users to create a full-screen background slideshow with customizable options for individual pages or posts. It integrates seamlessly with various image sources, including the WordPress Media Gallery, NextGEN Gallery, Flickr, Picasa, and SmugMug, allowing for versatility in image selection. Users can choose from a variety of transition effects and can easily manage slideshow settings through a dedicated panel in the post/page editor.

The plugin features options such as autoplay, slide interval adjustments, and keyboard navigation support. Users can also control background image positioning and customize the slideshow's appearance with navigation arrows and thumbnail previews. With its ability to render images while maintaining their aspect ratios, WP Supersized is an excellent tool for enhancing the visual appeal of WordPress sites.