The bad news is that it might not work with all Wordpress blogs and that the user who wants to exclude the categories needs to know their category ID. The first problem is easier to solve. Excluding categories from Wordpress feeds works if the Wordpress blog is not using the Feedburner feed redirection plugin or a comparable plugin. The feed redirection plugin redirects all feed requests (no matter if they are category specific or the full feed) to an RSS service like Feedburner. This prevents that users can create individual feeds based on categories, authors or tags. It also prevents the exclusion of categories in the feed.

Finding out the category IDs of a Wordpress blog is the second obstacle. Most webmasters use pretty permalinks which do not display IDs on the website. The only way to find out without asking the website owner is trial and error. Is is possible to open categories with their IDs in Wordpress even if the Pretty Permalinks option is enabled. To open a category with a category ID one would open the following url in a web browser:

http://www.ghacks.net/index.php?cat=23

This would open the Linux category here at Ghacks. This can be a very time consuming process as I have seen categories with five digits. So its probably best to ask the administrator about the category IDs. (Feel free to post additional solutions in the comments).

To exclude categories from RSS feeds in Wordpress one would use the following syntax:

http://www.ghacks.net/feed/?cat=-23

This removes category 23 from the main feed of the website. It is possible to exclude multiple categories from the feed, simply append an & and another cat=-xx in the end:

http://www.ghacks.net/feed/?cat=-23&cat=-9592

This excludes the Linux and Mac categories from the RSS feed.

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