diff --git a/WebApp/app.js b/WebApp/app.js
index ee5b2fb..8b93283 100644
--- a/WebApp/app.js
+++ b/WebApp/app.js
@@ -427,6 +427,17 @@ async function init() {
   bindEvents();
 
   document.documentElement.classList.add('loaded');
+
+  // Auto-open chat if URL contains ?open_chat parameter
+  // Usage: dekra.optki.de/?open_chat=true (defaults to truck)
+  //        dekra.optki.de/?open_chat=truck
+  //        dekra.optki.de/?open_chat=family
+  const urlParams = new URLSearchParams(window.location.search);
+  const openChatParam = urlParams.get('open_chat');
+  if (openChatParam) {
+    const entry = (openChatParam === 'family') ? 'family' : 'truck';
+    setTimeout(() => openChat(entry), 300);
+  }
 }
 
 document.readyState === 'loading'