Plus WebP or AVIF is a multimedia plugin designed for WordPress that facilitates the generation of WebP or AVIF image formats upon uploading files to the Media Library. This tool can convert existing images to these modern formats asynchronously, enhancing website performance through reduced file sizes. Users have the option to replace original images with their converted counterparts, streamlining media management and ensuring that all image URLs in the content are updated accordingly.

The plugin also supports WP-CLI commands for batch processing, making it suitable for sites with extensive media libraries. Commands like 'wp pluswebpavif webp' enable users to generate WebP images, while additional options allow for quality specification and selective processing of images. Furthermore, developers can utilize filter hooks for advanced database changes, providing a customizable approach to image management.