diff --git a/src/media.php b/src/media.php
index b0e9e81..9f7a226 100644
--- a/src/media.php
+++ b/src/media.php
@@ -149,23 +149,52 @@ class MediaManager {
 			return;
 		}
 
-		$selected = isset( $_GET[ $this->taxonomy ] ) ? $_GET[ $this->taxonomy ] : false;
-		$dropdown = wp_dropdown_categories([
+		$filter_name = "filter_" . $this->taxonomy;
+		$excluded_name = "excluded_" . $this->taxonomy;
+
+		$filter_dropdown = wp_dropdown_categories([
 			'show_option_all' => 'All Tags',
 			'taxonomy'        => $this->taxonomy,
-			'name'            => $this->taxonomy,
+			'name'            => $filter_name . "[]",
 			'orderby'         => 'name',
-			'selected'        => $selected,
 			'hierarchical'    => true,
 			'value_field'     => 'term_id',
 			'depth'           => 3,
-			'hide_empty'      => true,
+			'hide_empty'      => false,
 			'echo'            => false
 		]);
 
-		$dropdown = str_replace('<select ', '<select multiple ', $dropdown);
+		$selected = isset( $_GET[ $filter_name ] ) ? $_GET[ $filter_name ] : [];
+		$filter_dropdown = str_replace('<select ', '<select multiple ', $filter_dropdown);
+		$filter_dropdown = str_replace(" selected='selected'>", ">", $filter_dropdown);
+		foreach ( $selected as $sid ) {
+			$filter_dropdown = str_replace("value=\"{$sid}\">", "value=\"{$sid}\" selected>", $filter_dropdown);
+		}
 
-		echo $dropdown;
+		$excluded_dropdown = wp_dropdown_categories([
+			'show_option_all' => 'None',
+			'taxonomy'        => $this->taxonomy,
+			'name'            => $excluded_name . "[]",
+			'orderby'         => 'name',
+			'hierarchical'    => true,
+			'value_field'     => 'term_id',
+			'depth'           => 3,
+			'hide_empty'      => false,
+			'echo'            => false
+		]);
+
+		$selected = isset( $_GET[ $excluded_name ] ) ? $_GET[ $excluded_name ] : [ $this->tags->get_by_name("Generated")->id ];
+		$excluded_dropdown = str_replace('<select ', '<select multiple ', $excluded_dropdown);
+		$excluded_dropdown = str_replace(" selected='selected'>", ">", $excluded_dropdown);
+		foreach ( $selected as $sid ) {
+			$excluded_dropdown = str_replace("value=\"{$sid}\">", "value=\"{$sid}\" selected>", $excluded_dropdown);
+		}
+
+		
+		echo "<label for='{$filter_name}'>Inkludierte Tags</label>";
+		echo $filter_dropdown;
+		echo "<label for='{$excluded_name}'>Excludierte Tags</label>";
+		echo $excluded_dropdown;
 	}
 
 	public function apply_list_filter( $query ) {
@@ -176,27 +205,70 @@ class MediaManager {
 			return;
 		}
 
-		if (!empty($_GET[$this->taxonomy])) {
-			
-			$id = $_GET[$this->taxonomy];
+		$filter_name = "filter_" . $this->taxonomy;
+		$excluded_name = "excluded_" . $this->taxonomy;
 
-			$tag = $this->tags->get_by_id((int)$id);
-			if ( $tag === null ) {
-				return;
+		$queries = [];
+
+		if ( array_key_exists($filter_name, $_GET) && ! empty($_GET[$filter_name]) && array_search(0, $_GET[$filter_name]) !== 0 ) {
+
+			$tags = [];
+			foreach ( $_GET[$filter_name] as $id ) {
+
+				$tag = $this->tags->get_by_id((int)$id);
+				if ( $tag === null ) {
+					continue;
+				}
+
+				$tags = array_merge($tags, [$tag], $tag->get_all_children());
 			}
 
-			$tags = array_merge([$tag], $tag->get_all_children());
 			$ids = array_map(fn ($t) => $t->id, $tags);
 
-			unset($query->query_vars['ttgf_media_tags']);
-			$query->set('tax_query', [[
-				'taxonomy' => 'ttgf_media_tags',
+			$queries[] = [
+				'taxonomy' => $this->taxonomy,
 				'field' => 'term_id',
-				'terms' => [$ids[0]],
+				'terms' => $ids,
 				'include_children' => true,
-			]]);
+				'operator' => 'IN'
+			];
 		}
 
+		if ( ! array_key_exists($excluded_name, $_GET) ) {
+			$_GET[$excluded_name] = [ $this->tags->get_by_name("Generated")->id ];
+		}
+		
+		if ( (count($_GET[$excluded_name]) == 1 && $_GET[$excluded_name][0] != 0) || count($_GET[$excluded_name]) > 1 ) {
+
+			$tags = [];
+			foreach ( $_GET[$excluded_name] as $id ) {
+
+				$tag = $this->tags->get_by_id((int)$id);
+				if ( $tag === null ) {
+					continue;
+				}
+
+				$tags = array_merge($tags, [$tag], $tag->get_all_children());
+			}
+
+			$ids = array_map(fn ($t) => $t->id, $tags);
+
+			$queries[] = [
+				'taxonomy' => $this->taxonomy,
+				'field' => 'term_id',
+				'terms' => $ids,
+				'include_children' => true,
+				'operator' => 'NOT IN'
+			];
+
+		}
+
+		if ( count($queries) > 1 ) {
+			$queries['relation'] = 'AND';
+		}
+
+		$query->set('tax_query', $queries);
+
 	}
 
 	private function _build_dropdown( $name, $options, $selected, $empty = true ) {
diff --git a/src/tag.php b/src/tag.php
index 0643deb..4aa9f8d 100644
--- a/src/tag.php
+++ b/src/tag.php
@@ -107,6 +107,10 @@ class TagTree {
 			'update_count_callback' => '_update_generic_term_count'
 		]);
 
+		if ( empty(get_terms([ 'taxonomy' => $taxonomy_id, 'hide_empty' => false ])) ) {
+			wp_insert_term("Generated", $taxonomy_id);
+		}
+
 		return new TagTree($taxonomy_id);
 	}
 
@@ -185,7 +189,7 @@ class TagTree {
 	public function get_by_id( $term_id ) {
 
 		foreach ( $this->root_tags as $rt ) {
-			if ($rt->id == $term_id) {
+			if ( $rt->id == $term_id ) {
 				return $rt;
 			}
 
@@ -335,6 +339,4 @@ class TagTree {
 		}
 	}
 
-
-	
 }