This is a moderation assistance tool that prevents vulgar words from being posted on a phpBB forum. When someone attempts to post on a forum, the message, subject, username (for guests) and poll data will be scanned for unallowed words. If a naughty word is detected, the post will not be entered into the database. Instead, the poster will see an error message asking them to rephrase the post. The error message will include a preview of the post with the censor triggering words highlighted.

Private messages and text based profile fields (both default and custom) are also checked when submitted.

The list of words that Censor Block will flag is controlled through the forum admin panel "Word Censors" area. An optional add-on to remove censor checks rendered obsolete by Censor Block is included.