diff --git a/precache.php b/precache.php
new file mode 100644
index 0000000..843b57a
--- /dev/null
+++ b/precache.php
@@ -0,0 +1,231 @@
+<?php
+if (PHP_SAPI !== 'cli')
+{
+  http_response_code(404);
+  exit;
+}
+
+define('BRATONIEN_TOOLS_PRECACHE_BUILD', true);
+define('PHPWG_ROOT_PATH', '../../');
+
+$_SERVER['REMOTE_ADDR'] = '127.0.0.1';
+$_SERVER['SERVER_ADDR'] = '127.0.0.1';
+$_SERVER['SERVER_NAME'] = 'localhost';
+$_SERVER['HTTP_HOST'] = 'localhost';
+$_SERVER['SERVER_PORT'] = '80';
+$_SERVER['REQUEST_METHOD'] = 'GET';
+$_SERVER['REQUEST_URI'] = '/';
+$_SERVER['SCRIPT_NAME'] = '/plugins/bratonien_tools/precache.php';
+$_SERVER['PHP_SELF'] = $_SERVER['SCRIPT_NAME'];
+$_SERVER['QUERY_STRING'] = '';
+$_SERVER['HTTP_USER_AGENT'] = 'Bratonien-Watermark-Precache/1.0';
+$_SERVER['HTTPS'] = 'off';
+
+require_once(PHPWG_ROOT_PATH.'include/common.inc.php');
+
+if (!defined('BRATONIEN_TOOLS_PATH'))
+{
+  fwrite(STDERR, "Bratonien Tools ist nicht aktiv.\n");
+  exit(1);
+}
+
+require_once(BRATONIEN_TOOLS_PATH.'include/watermark_runtime.inc.php');
+require_once(PHPWG_ROOT_PATH.'include/derivative.inc.php');
+
+if (!bratonien_tools_watermark_engine_enabled())
+{
+  echo "Wasserzeichen-Engine ist deaktiviert; kein Precache notwendig.\n";
+  exit(0);
+}
+
+$profiles = array();
+foreach (bratonien_tools_get_watermark_profiles() as $profile)
+{
+  $profile_id = (int)$profile['id'];
+  if ($profile_id > 0 && !empty($profile['active']) && bratonien_tools_profile_watermark_path($profile))
+  {
+    $profiles[$profile_id] = $profile;
+  }
+}
+
+if (!$profiles)
+{
+  echo "Keine aktiven Wasserzeichenprofile vorhanden.\n";
+  exit(0);
+}
+
+$categories = bratonien_tools_get_category_tree();
+$rules = bratonien_tools_get_album_rules();
+$defaults = bratonien_tools_get_watermark_defaults();
+$category_profiles = array();
+foreach ($categories as $category)
+{
+  $category_id = (int)$category['id'];
+  $effective = bratonien_tools_resolve_album_rule($category_id, $categories, $rules, $defaults);
+  if ($effective['mode'] === 'profile' && !empty($effective['profile_id']))
+  {
+    $profile_id = (int)$effective['profile_id'];
+    if (isset($profiles[$profile_id]))
+    {
+      $category_profiles[$category_id] = $profile_id;
+    }
+  }
+}
+
+$image_categories = array();
+$result = pwg_query('SELECT image_id, category_id FROM '.IMAGE_CATEGORY_TABLE.' ORDER BY image_id, category_id');
+while ($row = pwg_db_fetch_assoc($result))
+{
+  $image_id = (int)$row['image_id'];
+  $image_categories[$image_id][] = (int)$row['category_id'];
+}
+
+$root_url = get_absolute_root_url();
+$endpoint = rtrim($root_url, '/').'/plugins/'.BRATONIEN_TOOLS_ID.'/watermark.php';
+$types = ImageStdParams::get_defined_type_map();
+
+$checked = 0;
+$generated = 0;
+$already_cached = 0;
+$skipped = 0;
+$errors = 0;
+
+$result = pwg_query('SELECT * FROM '.IMAGES_TABLE.' ORDER BY id');
+while ($image = pwg_db_fetch_assoc($result))
+{
+  $image_id = (int)$image['id'];
+  $profile_ids = array();
+
+  foreach ($image_categories[$image_id] ?? array() as $category_id)
+  {
+    if (isset($category_profiles[$category_id]))
+    {
+      $profile_ids[$category_profiles[$category_id]] = true;
+    }
+  }
+
+  if (!$profile_ids)
+  {
+    $skipped++;
+    continue;
+  }
+
+  $src_image = new SrcImage($image);
+  $source_path = $src_image->get_path();
+  if (!is_file($source_path) || !is_readable($source_path))
+  {
+    fwrite(STDERR, "Bild #$image_id: Quelldatei nicht lesbar: $source_path\n");
+    $errors++;
+    continue;
+  }
+
+  foreach (array_keys($profile_ids) as $profile_id)
+  {
+    $profile = $profiles[$profile_id];
+
+    foreach ($types as $type => $params)
+    {
+      $checked++;
+
+      if ($src_image->has_size())
+      {
+        $size = $params->compute_final_size($src_image->get_size());
+        if ($size && ($size[0] < (int)$profile['min_width'] || $size[1] < (int)$profile['min_height']))
+        {
+          $skipped++;
+          continue;
+        }
+      }
+
+      $derivative = new DerivativeImage($params, $src_image);
+      $derivative_path = $derivative->get_path();
+      $root_path = PHPWG_ROOT_PATH;
+      if (strpos($derivative_path, $root_path) !== 0)
+      {
+        $skipped++;
+        continue;
+      }
+
+      $rel_url = substr($derivative_path, strlen($root_path));
+      if (strpos($rel_url, PWG_DERIVATIVE_DIR) !== 0)
+      {
+        $skipped++;
+        continue;
+      }
+
+      $extension = strtolower(pathinfo($derivative_path, PATHINFO_EXTENSION));
+      $descriptor = bratonien_tools_runtime_cache_descriptor($rel_url, $profile, $params, $source_path, $extension);
+      if (!$descriptor)
+      {
+        $errors++;
+        continue;
+      }
+
+      if (is_file($descriptor['path']) && is_readable($descriptor['path']))
+      {
+        $already_cached++;
+        continue;
+      }
+
+      $profile_version = $descriptor['profile_version'];
+      $signature = bratonien_tools_runtime_sign($rel_url, $profile_id, $profile_version);
+      $url = $endpoint.'?p='.$profile_id.'&v='.rawurlencode($profile_version).
+        '&u='.rawurlencode(bratonien_tools_runtime_b64url_encode($rel_url)).'&s='.$signature;
+
+      $ok = false;
+      if (function_exists('curl_init'))
+      {
+        $ch = curl_init($url);
+        curl_setopt_array($ch, array(
+          CURLOPT_RETURNTRANSFER => false,
+          CURLOPT_FOLLOWLOCATION => true,
+          CURLOPT_MAXREDIRS => 2,
+          CURLOPT_CONNECTTIMEOUT => 3,
+          CURLOPT_TIMEOUT => 120,
+          CURLOPT_FAILONERROR => false,
+          CURLOPT_USERAGENT => 'Bratonien-Watermark-Precache/1.0',
+          CURLOPT_WRITEFUNCTION => static function ($ch, $data) { return strlen($data); },
+        ));
+        curl_exec($ch);
+        $status = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
+        $curl_error = curl_error($ch);
+        curl_close($ch);
+        $ok = ($status >= 200 && $status < 300 && is_file($descriptor['path']));
+        if (!$ok)
+        {
+          fwrite(STDERR, "Bild #$image_id / Profil #$profile_id / $type: Precache fehlgeschlagen (HTTP $status".($curl_error !== '' ? ", $curl_error" : '').").\n");
+        }
+      }
+      else
+      {
+        $context = stream_context_create(array('http'=>array('timeout'=>120, 'ignore_errors'=>true)));
+        @file_get_contents($url, false, $context);
+        $ok = is_file($descriptor['path']);
+        if (!$ok)
+        {
+          fwrite(STDERR, "Bild #$image_id / Profil #$profile_id / $type: Precache fehlgeschlagen.\n");
+        }
+      }
+
+      if ($ok)
+      {
+        $generated++;
+      }
+      else
+      {
+        $errors++;
+      }
+    }
+  }
+}
+
+printf(
+  "Wasserzeichen-Precache: %d Varianten geprueft, %d neu erzeugt, %d bereits vorhanden, %d uebersprungen, %d Fehler.\n",
+  $checked,
+  $generated,
+  $already_cached,
+  $skipped,
+  $errors
+);
+
+exit($errors > 0 ? 1 : 0);