This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

Assign Missing Categories


If you have converted categories to tags and are now left with a lot of posts that have no category assigned (that show up with ‘Uncategorized,’ unlinked, as the category under Posts), you can use this plugin to assign the default category to all those posts at once.


  1. Upload the files to the /wp-content/plugins/ directory
  2. Activate the plugin through the ‘Plugins’ menu in WordPress
  3. Go to Posts → Assign Missing Categories


September 5, 2018
Simple but effective. Still works on my last version Wordpress. It's not sofisticate and do his job. Obviously you must know what you are doing.
September 3, 2016
Solved my migration issues from FlatPress. No more uncategorised categories! Thank you Stephanie!
September 3, 2016
Struggled for days to assign post (custom post type) without categories to a category. Just changed line 61 to my custom post type. But it worked perfectly!
Read all 8 reviews

Contributors & Developers

“Assign Missing Categories” is open source software. The following people have contributed to this plugin.




  • stop using deprecated junk
  • clean the term cache after assigning posts
  • localized strings (July 29, 2011)


  • user capability check (August 3, 2009)


  • first release (November 17, 2008)