diff --git a/contrib/word_filter/main.php b/contrib/word_filter/main.php
new file mode 100644
index 00000000..f8918cda
--- /dev/null
+++ b/contrib/word_filter/main.php
@@ -0,0 +1,43 @@
+<?php
+
+class WordFilter extends Extension {
+	public function receive_event($event) {
+		if(is_a($event, 'TextFormattingEvent')) {
+			$event->formatted = $this->filter($event->formatted);
+			$event->stripped  = $this->filter($event->stripped);
+		}
+		if(is_a($event, 'SetupBuildingEvent')) {
+			$sb = new SetupBlock("Word Filter");
+			$sb->add_longtext_option("word_filter");
+			$sb->add_label("<br>(each line should be search term and replace term, separated by a comma)");
+			$event->panel->add_block($sb);
+		}
+		if(is_a($event, 'ConfigSaveEvent')) {
+			$event->config->set_string_from_post("word_filter");
+		}
+	}
+	
+	private function filter($text) {
+		$map = $this->get_map();
+		foreach($map as $search => $replace) {
+			$text = str_replace($search, $replace, $text);
+		}
+		return $text;
+	}
+
+	private function get_map() {
+		global $config;
+		$raw = $config->get_string("word_filter");
+		$lines = explode("\n", $raw);
+		$map = array();
+		foreach($lines as $line) {
+			$parts = split(",", $line);
+			if(count($parts) == 2) {
+				$map[$parts[0]] = $parts[1];
+			}
+		}
+		return $map;
+	}
+}
+add_event_listener(new WordFilter());
+?>