diff --git a/resources/views/web/layouts/web-master.blade.php b/resources/views/web/layouts/web-master.blade.php
index fbbc913..93963e7 100644
--- a/resources/views/web/layouts/web-master.blade.php
+++ b/resources/views/web/layouts/web-master.blade.php
@@ -5,9 +5,38 @@
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <meta name="csrf-token" content="{{ csrf_token() }}">
-    <meta name="description" content="@yield('meta_description', $domainName ?? config('app.name', 'Laravel'))">
 
-    <title>@yield('title', $domainName ?? config('app.name', 'Laravel'))</title>
+    @php
+        $siteName = $domainName ?? config('app.name', 'Laravel');
+        $pageTitle = trim($__env->yieldContent('title')) ?: $siteName;
+        $pageDescription = trim($__env->yieldContent('meta_description')) ?: $siteName;
+        // Self-Canonical als Default aus der Portal-URL + Request-Pfad (ohne Query):
+        // pro Portal/Domain getrennt und unabhängig von URL::forceRootUrl – verhindert Cross-Portal-Duplicate.
+        $portalBase = rtrim($domainUrl ?? config('app.url'), '/');
+        $canonicalUrl = trim($__env->yieldContent('canonical')) ?: ($portalBase.request()->getPathInfo());
+        $ogType = trim($__env->yieldContent('og_type')) ?: 'website';
+        $ogImage = trim($__env->yieldContent('og_image'));
+    @endphp
+
+    <meta name="description" content="{{ $pageDescription }}">
+
+    <title>{{ $pageTitle }}</title>
+
+    {{-- Kanonische URL --}}
+    <link rel="canonical" href="{{ $canonicalUrl }}">
+
+    {{-- OpenGraph / Social --}}
+    <meta property="og:type" content="{{ $ogType }}">
+    <meta property="og:site_name" content="{{ $siteName }}">
+    <meta property="og:title" content="{{ $pageTitle }}">
+    <meta property="og:description" content="{{ $pageDescription }}">
+    <meta property="og:url" content="{{ $canonicalUrl }}">
+    @if ($ogImage)
+        <meta property="og:image" content="{{ $ogImage }}">
+    @endif
+    <meta name="twitter:card" content="{{ $ogImage ? 'summary_large_image' : 'summary' }}">
+    <meta name="twitter:title" content="{{ $pageTitle }}">
+    <meta name="twitter:description" content="{{ $pageDescription }}">
 
     <!-- Domain-spezifisches Favicon -->
     <link rel="icon" href="{{ asset(\App\Helpers\ThemeHelper::getFaviconPath()) }}">
diff --git a/resources/views/web/release-detail.blade.php b/resources/views/web/release-detail.blade.php
index b10a6d1..672ea4b 100644
--- a/resources/views/web/release-detail.blade.php
+++ b/resources/views/web/release-detail.blade.php
@@ -1,6 +1,9 @@
 @extends('web.layouts.web-master')
 
 @section('title', 'KI-Revolution in Deutschland - Business Portal 24')
+@section('meta_description', 'Neue Studie zeigt massive Investitionen deutscher Unternehmen in künstliche Intelligenz für 2025.')
+@section('og_type', 'article')
+@section('canonical', route('release.detail', ['slug' => $releaseSlug]))
 
 @section('content')
 
diff --git a/tests/Feature/Web/CanonicalMetaTest.php b/tests/Feature/Web/CanonicalMetaTest.php
new file mode 100644
index 0000000..0c15e49
--- /dev/null
+++ b/tests/Feature/Web/CanonicalMetaTest.php
@@ -0,0 +1,29 @@
+<?php
+
+use Tests\TestCase;
+
+test('the release detail page emits an article canonical from its slug', function () {
+    /** @var TestCase $this */
+    $this->get('https://businessportal24.test/release/ki-revolution')
+        ->assertSuccessful()
+        ->assertSee('<link rel="canonical" href="', false)
+        ->assertSee('/release/ki-revolution', false)
+        ->assertSee('<meta property="og:type" content="article">', false)
+        ->assertSee('<meta property="og:url" content="', false);
+});
+
+test('a portal homepage emits a self-referencing canonical for its own domain', function () {
+    /** @var TestCase $this */
+    $this->get('https://businessportal24.test/')
+        ->assertSuccessful()
+        ->assertSee('<link rel="canonical" href="https://businessportal24.test', false)
+        ->assertSee('<meta property="og:site_name" content="', false);
+});
+
+test('portals stay self-canonical on their own host, never cross-portal', function () {
+    /** @var TestCase $this */
+    $this->get('https://presseecho.test/')
+        ->assertSuccessful()
+        ->assertSee('<link rel="canonical" href="https://presseecho.test', false)
+        ->assertDontSee('businessportal24.test', false);
+});