diff --git a/include/batch_titles.inc.php b/include/batch_titles.inc.php
new file mode 100644
index 0000000..9ec5c14
--- /dev/null
+++ b/include/batch_titles.inc.php
@@ -0,0 +1,226 @@
+<?php
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die('Hacking attempt!');
+}
+
+/**
+ * Adds the sequential-title action to Piwigo's global batch manager.
+ *
+ * The batch manager itself owns the selection. Bratonien Tools only receives
+ * the validated collection through Piwigo's element_set_global_action event.
+ */
+function bratonien_tools_batch_titles_register_action()
+{
+  global $template;
+
+  $defaults = array(
+    'prefix' => isset($_POST['bratonien_title_prefix']) ? (string)$_POST['bratonien_title_prefix'] : '',
+    'start' => isset($_POST['bratonien_title_start']) ? (int)$_POST['bratonien_title_start'] : 1,
+    'padding' => isset($_POST['bratonien_title_padding']) ? (int)$_POST['bratonien_title_padding'] : 3,
+    'replace_mode' => isset($_POST['bratonien_title_replace_mode']) ? (string)$_POST['bratonien_title_replace_mode'] : 'camera',
+    'sort' => isset($_POST['bratonien_title_sort']) ? (string)$_POST['bratonien_title_sort'] : 'filename',
+  );
+
+  $template->assign('BRATONIEN_BATCH_TITLES', $defaults);
+  $template->set_filename('bratonien_batch_titles_action', BRATONIEN_TOOLS_PATH.'template/batch_titles_action.tpl');
+
+  $template->append('element_set_global_plugins_actions', array(
+    'ID' => 'bratonien_sequential_titles',
+    'NAME' => 'Fortlaufende Bildtitel',
+    'CONTENT' => $template->parse('bratonien_batch_titles_action', true),
+  ));
+}
+
+/**
+ * Executes the action after Piwigo has built and validated the selected image
+ * collection.
+ */
+function bratonien_tools_batch_titles_apply($action, $collection)
+{
+  global $page;
+
+  if ($action !== 'bratonien_sequential_titles')
+  {
+    return;
+  }
+
+  $ids = array_values(array_unique(array_filter(array_map('intval', (array)$collection), function ($id) {
+    return $id > 0;
+  })));
+
+  if (empty($ids))
+  {
+    $page['errors'][] = 'Keine Bilder für die Titelvergabe ausgewählt.';
+    return;
+  }
+
+  $prefix = trim((string)($_POST['bratonien_title_prefix'] ?? ''));
+  $start = isset($_POST['bratonien_title_start']) ? (int)$_POST['bratonien_title_start'] : 1;
+  $padding = isset($_POST['bratonien_title_padding']) ? (int)$_POST['bratonien_title_padding'] : 3;
+  $replace_mode = (string)($_POST['bratonien_title_replace_mode'] ?? 'camera');
+  $sort = (string)($_POST['bratonien_title_sort'] ?? 'filename');
+
+  if ($start < 0)
+  {
+    $page['errors'][] = 'Die Startnummer darf nicht negativ sein.';
+    return;
+  }
+
+  if ($padding < 1 || $padding > 12)
+  {
+    $page['errors'][] = 'Die Stellenzahl muss zwischen 1 und 12 liegen.';
+    return;
+  }
+
+  if (!in_array($replace_mode, array('camera', 'all'), true))
+  {
+    $page['errors'][] = 'Ungültiger Ersetzungsmodus.';
+    return;
+  }
+
+  if (!in_array($sort, array('filename', 'date_creation', 'album_order'), true))
+  {
+    $page['errors'][] = 'Ungültige Sortierung.';
+    return;
+  }
+
+  $images = bratonien_tools_batch_titles_get_images($ids, $sort);
+  if ($images === false)
+  {
+    $page['errors'][] = 'Die aktuelle Albumreihenfolge kann nur verwendet werden, wenn die Stapelverarbeitung auf genau ein Album ohne Unteralben gefiltert ist.';
+    return;
+  }
+
+  $number = $start;
+  $updates = array();
+  $changed_ids = array();
+
+  foreach ($images as $image)
+  {
+    if ($replace_mode === 'camera' && !bratonien_tools_batch_titles_is_replaceable($image))
+    {
+      continue;
+    }
+
+    $number_text = str_pad((string)$number, $padding, '0', STR_PAD_LEFT);
+    $title = $prefix === '' ? $number_text : $prefix.' - '.$number_text;
+
+    $updates[] = array(
+      'id' => (int)$image['id'],
+      'name' => $title,
+    );
+    $changed_ids[] = (int)$image['id'];
+    $number++;
+  }
+
+  if (empty($updates))
+  {
+    $page['infos'][] = 'Keine Bildtitel mussten geändert werden.';
+    return;
+  }
+
+  mass_updates(
+    IMAGES_TABLE,
+    array('primary' => array('id'), 'update' => array('name')),
+    $updates
+  );
+
+  if (function_exists('pwg_activity'))
+  {
+    pwg_activity('photo', $changed_ids, 'edit', array('action' => 'title'));
+  }
+
+  // Piwigo invalidates its cache before notifying plugin actions. Invalidate it
+  // again after our own database update so the new titles are immediately used.
+  invalidate_user_cache();
+
+  $page['infos'][] = sprintf(
+    '%d Bildtitel wurden fortlaufend aktualisiert.',
+    count($updates)
+  );
+}
+
+/**
+ * Returns selected images in the order requested by the administrator.
+ * Returns false if album order was requested without a single current album.
+ */
+function bratonien_tools_batch_titles_get_images($ids, $sort)
+{
+  global $conf;
+
+  $id_list = implode(',', array_map('intval', $ids));
+
+  if ($sort === 'album_order')
+  {
+    if (
+      empty($_SESSION['bulk_manager_filter']['category'])
+      || isset($_SESSION['bulk_manager_filter']['category_recursive'])
+    )
+    {
+      return false;
+    }
+
+    $category_id = (int)$_SESSION['bulk_manager_filter']['category'];
+    if ($category_id < 1)
+    {
+      return false;
+    }
+
+    $category_info = get_cat_info($category_id);
+    $order_by = $conf['order_by_inside_category'];
+    if (!empty($category_info['image_order']))
+    {
+      $order_by = ' ORDER BY '.$category_info['image_order'];
+    }
+
+    $query = '\nSELECT id, name, file, date_creation\n  FROM '.IMAGES_TABLE.'\n  JOIN '.IMAGE_CATEGORY_TABLE.' ON id = image_id\n  WHERE id IN ('.$id_list.')\n    AND category_id = '.$category_id.'\n  '.$order_by.'\n;';
+  }
+  else
+  {
+    if ($sort === 'date_creation')
+    {
+      $order_by = ' ORDER BY (date_creation IS NULL), date_creation ASC, file ASC, id ASC';
+    }
+    else
+    {
+      $order_by = ' ORDER BY file ASC, id ASC';
+    }
+
+    $query = '\nSELECT id, name, file, date_creation\n  FROM '.IMAGES_TABLE.'\n  WHERE id IN ('.$id_list.')\n  '.$order_by.'\n;';
+  }
+
+  $result = pwg_query($query);
+  $images = array();
+  while ($row = pwg_db_fetch_assoc($result))
+  {
+    $images[] = $row;
+  }
+
+  return $images;
+}
+
+/**
+ * Conservative detection of empty, filename-derived and common camera/import
+ * titles. Meaningful custom titles are left untouched in "camera" mode.
+ */
+function bratonien_tools_batch_titles_is_replaceable($image)
+{
+  $title = trim((string)($image['name'] ?? ''));
+  if ($title === '')
+  {
+    return true;
+  }
+
+  $file = (string)($image['file'] ?? '');
+  $file_base = pathinfo($file, PATHINFO_FILENAME);
+  if ($file_base !== '' && strcasecmp($title, $file_base) === 0)
+  {
+    return true;
+  }
+
+  return (bool)preg_match(
+    '/^(?:DSC[F]?|IMG|PXL|DCIM|SAM|PIC|PHOTO|IMAGE)[-_ ]?\d+(?:[-_ ].*)?$/i',
+    $title
+  );
+}