HotCat is a JavaScript that helps registered users easily remove, change and add categories to Wikipedia pages. It has a suggestions list that will propose existing categories for auto-completion.
Whenever a page is loaded, HotCat looks for the category bar. If there are visible categories, it adds links to easily remove, change or add categories:
The new links are:
"(-)" after a category: when clicked, the category is automatically removed.
"(±)" after a category: when clicked, an input field to change this category is opened.
"(↓)" after a category: when clicked, the input field is opened, and a list of available subcategories is displayed.
"(↑)" after a category: when clicked, the input field is opened, and a list of available parent categories is shown.
"(+)" at the end of the list of categories: when clicked, an input field to add a category is opened.
"(++)" at the front: when clicked, enters multi-change mode, allowing modifying more than one category.
If HotCat can detect that a certain category is not in the page text itself but was transcluded onto the page from a template or other transclusion, it will not add these links. Only categories that are present in the wikitext of the page itself can be modified through HotCat.
For more information about how to use HotCat, please view the
English Wikipedia.