diff --git a/runtime/lib/sync-webdav-metadata.php b/runtime/lib/sync-webdav-metadata.php
new file mode 100644
index 0000000..a53ef86
--- /dev/null
+++ b/runtime/lib/sync-webdav-metadata.php
@@ -0,0 +1,106 @@
+#!/usr/bin/env php
+<?php
+if (PHP_SAPI !== 'cli')
+{
+  fwrite(STDERR, "CLI only\n");
+  exit(1);
+}
+
+$options = getopt('', array('piwigo-root:', 'connection-id:', 'mapping:'));
+$piwigo_root = rtrim((string)($options['piwigo-root'] ?? ''), '/');
+$connection_id = (int)($options['connection-id'] ?? 0);
+$mapping_file = (string)($options['mapping'] ?? '');
+
+if ($piwigo_root === '' || $connection_id < 1 || $mapping_file === '' || !is_readable($mapping_file))
+{
+  fwrite(STDERR, "Parameter --piwigo-root, --connection-id und --mapping werden benoetigt.\n");
+  exit(1);
+}
+
+$mapping = json_decode((string)file_get_contents($mapping_file), true);
+if (!is_array($mapping) || !isset($mapping['files']) || !is_array($mapping['files']))
+{
+  fwrite(STDERR, "WebDAV-Mapping ist ungueltig.\n");
+  exit(1);
+}
+
+$dimensions = array();
+foreach ($mapping['files'] as $path => $entry)
+{
+  if (!is_array($entry) || (string)($entry['kind'] ?? '') !== 'file') continue;
+  $width = (int)($entry['width'] ?? 0);
+  $height = (int)($entry['height'] ?? 0);
+  if ($width < 1 || $height < 1) continue;
+  $dimensions[str_replace('\\', '/', (string)$path)] = array($width, $height);
+}
+
+if (!$dimensions)
+{
+  fwrite(STDERR, "WebDAV-Mapping enthaelt keine Originalabmessungen.\n");
+  exit(1);
+}
+
+define('PHPWG_ROOT_PATH', $piwigo_root.'/');
+$_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'] = '/';
+$_SERVER['SCRIPT_NAME'] = '/plugins/bratonien_tools/runtime/lib/sync-webdav-metadata.php';
+$_SERVER['PHP_SELF'] = $_SERVER['SCRIPT_NAME'];
+$_SERVER['QUERY_STRING'] = '';
+$_SERVER['HTTP_USER_AGENT'] = 'Bratonien-WebDAV-Metadata/0.9.6.8.20';
+$_SERVER['HTTPS'] = 'off';
+
+require_once(PHPWG_ROOT_PATH.'include/common.inc.php');
+
+$checked = 0;
+$updated = 0;
+$missing = 0;
+$result = pwg_query('SELECT id, path, width, height FROM '.IMAGES_TABLE.' ORDER BY id');
+while ($row = pwg_db_fetch_assoc($result))
+{
+  $path = (string)($row['path'] ?? '');
+  if ($path === '') continue;
+
+  $absolute = $path;
+  if (strpos($absolute, '/') !== 0)
+  {
+    $absolute = PHPWG_ROOT_PATH.ltrim(preg_replace('#^\./#', '', $absolute), '/');
+  }
+
+  $normalized_shadow = str_replace('\\', '/', $absolute);
+  if (strpos($normalized_shadow, '/nc-webdav-gallery/connection-'.$connection_id.'/') === false) continue;
+
+  $checked++;
+  $resolved = realpath($absolute);
+  if ($resolved === false)
+  {
+    $missing++;
+    continue;
+  }
+
+  $key = str_replace('\\', '/', $resolved);
+  if (!isset($dimensions[$key]))
+  {
+    $missing++;
+    continue;
+  }
+
+  list($width, $height) = $dimensions[$key];
+  if ((int)$row['width'] === $width && (int)$row['height'] === $height) continue;
+
+  pwg_query('UPDATE '.IMAGES_TABLE.' SET width='.$width.', height='.$height.' WHERE id='.(int)$row['id']);
+  $updated++;
+}
+
+if ($updated > 0)
+{
+  if (function_exists('update_category')) update_category('all');
+  if (function_exists('invalidate_user_cache')) invalidate_user_cache(true);
+}
+
+echo 'WebDAV-Metadaten: bilder='.$checked.' aktualisiert='.$updated.' ohne_masse='.$missing."\n";
+exit($missing > 0 ? 1 : 0);