diff --git a/package.json b/package.json
index 4f120bd..c8732b4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lageplan",
-  "version": "1.3.4",
+  "version": "1.3.5",
   "description": "Feuerwehr Lageplan - Krokier-App für Einsatzdokumentation",
   "private": true,
   "scripts": {
diff --git a/src/app/app/page.tsx b/src/app/app/page.tsx
index 22c73d6..627a32d 100644
--- a/src/app/app/page.tsx
+++ b/src/app/app/page.tsx
@@ -50,7 +50,8 @@ export default function AppPage() {
   const [isFullscreen, setIsFullscreen] = useState(false)
   const [auditLog, setAuditLog] = useState<{ time: string; action: string }[]>([])
   const [isAuditOpen, setIsAuditOpen] = useState(false)
-  
+  const [presentationLocked, setPresentationLocked] = useState(false)
+
   const [isSidebarCollapsed, setIsSidebarCollapsed] = useState(false)
   const [lastMapScreenshot, setLastMapScreenshot] = useState<string>('')
   const [defaultSymbolScale, setDefaultSymbolScale] = useState(1.5)
@@ -375,7 +376,7 @@ export default function AppPage() {
 
   const roleCanEdit = user ? (user.role === 'SERVER_ADMIN' || user.role === 'TENANT_ADMIN' || user.role === 'OPERATOR') : false
   // User can only edit if they have the role AND they hold the editing lock (or no one is editing)
-  const canEdit = roleCanEdit && (isEditingByMe || !editingBy)
+  const canEdit = !presentationLocked && roleCanEdit && (isEditingByMe || !editingBy)
   const isReadOnly = !!editingBy && !isEditingByMe
 
   // Auto-save: localStorage persistence + debounced API save + beacon on unload
@@ -806,6 +807,14 @@ export default function AppPage() {
           userRole={user?.role}
           onLogout={logout}
           onStartTour={() => { resetOnboardingTour(); setShowTour(true) }}
+          presentationLocked={presentationLocked}
+          onTogglePresentationLock={() => {
+            const next = !presentationLocked
+            setPresentationLocked(next)
+            if (next && isEditingByMe) {
+              handleStopEditing()
+            }
+          }}
         />
 
         {/* Offline banner */}
diff --git a/src/components/layout/topbar.tsx b/src/components/layout/topbar.tsx
index 8a8fa68..dcc8376 100644
--- a/src/components/layout/topbar.tsx
+++ b/src/components/layout/topbar.tsx
@@ -39,6 +39,8 @@ import {
   Shield,
   MapPin,
   HelpCircle,
+  Lock,
+  Unlock,
 } from 'lucide-react'
 import { HoseSettingsDialog } from '@/components/dialogs/hose-settings-dialog'
 import type { Project, DrawFeature } from '@/types'
@@ -66,6 +68,8 @@ interface TopbarProps {
   userRole?: string
   onLogout?: () => void
   onStartTour?: () => void
+  presentationLocked?: boolean
+  onTogglePresentationLock?: () => void
 }
 
 export function Topbar({
@@ -89,6 +93,8 @@ export function Topbar({
   userRole,
   onLogout,
   onStartTour,
+  presentationLocked,
+  onTogglePresentationLock,
 }: TopbarProps) {
   const [isLoadDialogOpen, setIsLoadDialogOpen] = useState(false)
   const [isHoseSettingsOpen, setIsHoseSettingsOpen] = useState(false)
@@ -172,6 +178,16 @@ export function Topbar({
             <span className="hidden lg:inline">{isSaving ? 'Speichern...' : 'Speichern'}</span>
           </Button>
 
+          <Button
+            variant={presentationLocked ? 'default' : 'outline'}
+            className={`h-9 md:h-10 px-2 md:px-3 text-sm ${presentationLocked ? 'bg-amber-600 hover:bg-amber-700 text-white border-amber-600' : ''}`}
+            onClick={onTogglePresentationLock}
+            title={presentationLocked ? 'Präsentationsmodus deaktivieren' : 'Präsentationsmodus aktivieren'}
+          >
+            {presentationLocked ? <Lock className="w-5 h-5 md:mr-1" /> : <Unlock className="w-5 h-5 md:mr-1" />}
+            <span className="hidden lg:inline">{presentationLocked ? 'Gesperrt' : 'Frei'}</span>
+          </Button>
+
           <DropdownMenu>
             <DropdownMenuTrigger asChild>
               <Button variant="outline" className="h-9 md:h-10 px-2 md:px-3 text-sm" title="Menü">