tomasbulva

Allows to edit categories in bulk at attachement/media page, needs to have categories for media enabled.

Bulk Categories Edit for Media

Allows to edit categories in bulk at attachement/media page, needs to have categories for media enabled.

MasterNs

Bulk post editing allows you to apply actions on a number of selected WordPress posts instead of doing it manually on each post 
which could be time consuming particularly if you have a large amount of posts.
However, default bulk editor allows you just to add Categories to Posts. 
This plugin extends default Bulk Editor so you can remove Categories from posts.
The plugin works with default Post type, Woocommerce products and any other Custom Post Type. Supports multiple taxonomies per post.

Bulk remove posts from category

Simple and very good

Not working

Now you can use default WordPress Bulk Editor not just to add Categories but also to remove categories from posts.

Bulk Categories Edit for Media vs Bulk remove posts from category