WP Category Permalink is a free WordPress plugin designed to enhance your post permalinks and improve SEO by allowing users to select a primary category for their posts. This plugin addresses the default behavior of WordPress, which automatically assigns the lowest ID category when multiple categories are assigned. Users can choose their preferred category directly from the 'Post Edit' page, making it clear and straightforward. The selected category is prominently displayed in bold on both the 'Posts List' and 'Post Edit' pages, simplifying the editing process.

Additionally, the plugin supports custom permalink structures like /%category%/%postname%/, enhancing visibility and search engine optimization. It is compatible with various themes and plugins that create post types and taxonomies, although it does not support the 'Types' plugin. Users are encouraged to contribute to the ongoing development of the plugin to adapt it to specific needs, ensuring continuous improvement.