diff --git a/auth-app/templates/images.html b/auth-app/templates/images.html
index f3cbe07..535aa0a 100644
--- a/auth-app/templates/images.html
+++ b/auth-app/templates/images.html
@@ -46,7 +46,8 @@
 
 <div class="card">
     <h2>Image aus anderer Registry holen</h2>
-    <form method="post" action="{{ url_for('pull_image') }}">
+    <form method="post" action="{{ url_for('pull_image') }}"
+          onsubmit="showBusy('Image wird geholt &ndash; das kann je nach Groesse einige Minuten dauern. Bitte warten&hellip;');">
         <div class="form-row">
             <div class="form-group">
                 <label for="source">Quell-Image</label>
@@ -94,7 +95,8 @@
 
 <div class="card">
     <h2>Mehrere Images aus docker-compose holen</h2>
-    <form method="post" action="{{ url_for('pull_compose') }}" enctype="multipart/form-data">
+    <form method="post" action="{{ url_for('pull_compose') }}" enctype="multipart/form-data"
+          onsubmit="showBusy('Images werden geholt &ndash; bei mehreren oder grossen Images kann das einige Minuten dauern. Bitte warten&hellip;');">
         <div class="form-group">
             <label for="compose">docker-compose einfuegen</label>
             <textarea id="compose" name="compose" rows="10"
@@ -178,7 +180,7 @@
 
     <div style="margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid #e5e7eb;">
         <form method="post" action="{{ url_for('garbage_collect') }}"
-              onsubmit="return confirm('Garbage Collection jetzt ausfuehren? Loesche waehrenddessen keine Images und pushe nichts.');">
+              onsubmit="if(!confirm('Garbage Collection jetzt ausfuehren? Loesche waehrenddessen keine Images und pushe nichts.')) return false; showBusy('Speicher wird aufgeraeumt. Bitte warten&hellip;');">
             <button type="submit" class="btn btn-secondary">Speicher aufraeumen (Garbage Collection)</button>
         </form>
         <p style="margin-top: 0.6rem; font-size: 0.85rem; color: #6b7280; line-height: 1.6;">
@@ -190,7 +192,27 @@
     </div>
 </div>
 
+<div id="busy-overlay"
+     style="display: none; position: fixed; inset: 0; background: rgba(15,23,42,0.6);
+            z-index: 100; align-items: center; justify-content: center;">
+    <div style="background: #fff; padding: 1.5rem 2rem; border-radius: 8px; max-width: 420px;
+                text-align: center; box-shadow: 0 10px 25px rgba(0,0,0,0.2);">
+        <div class="spinner" style="width: 32px; height: 32px; margin: 0 auto 1rem;
+             border: 3px solid #e5e7eb; border-top-color: #2563eb; border-radius: 50%;
+             animation: spin 0.8s linear infinite;"></div>
+        <p id="busy-text" style="font-size: 0.95rem; color: #374151; line-height: 1.5;">Bitte warten&hellip;</p>
+    </div>
+</div>
+<style>@keyframes spin { to { transform: rotate(360deg); } }</style>
+
 <script>
+    // Vollbild-Hinweis fuer langlaufende Aktionen (Pull / Garbage Collection).
+    function showBusy(htmlText) {
+        document.getElementById('busy-text').innerHTML = htmlText;
+        document.getElementById('busy-overlay').style.display = 'flex';
+        return true;
+    }
+
     // Benutzername/Kennwort und Access Token schliessen sich gegenseitig aus.
     function toggleCredMode(prefix, mode) {
         var creds = document.getElementById(prefix + 'use_creds');