diff --git a/.claude/settings.local.json b/.claude/settings.local.json
index bbf35b2..28fd183 100644
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -9,7 +9,8 @@
       "Bash(docker-compose down:*)",
       "Bash(docker logs:*)",
       "Bash(docker exec:*)",
-      "Bash(python3:*)"
+      "Bash(python3:*)",
+      "Bash(docker-compose restart:*)"
     ],
     "deny": []
   }
diff --git a/JOURNAL.md b/JOURNAL.md
index cf5bf8a..3f88bf2 100644
--- a/JOURNAL.md
+++ b/JOURNAL.md
@@ -100,4 +100,24 @@ Lizenzmanagement-System für Social Media Account-Erstellungssoftware mit Docker
 ### 2025-01-06 - Journal erstellt
 - Initialer Projektstand dokumentiert
 - Aufgabenliste priorisiert
-- Technische Anforderungen festgehalten
\ No newline at end of file
+- Technische Anforderungen festgehalten
+
+### 2025-01-06 - UTF-8 Support implementiert
+- Flask App Konfiguration für UTF-8 hinzugefügt (JSON_AS_ASCII=False)
+- PostgreSQL Verbindung mit UTF-8 client_encoding
+- HTML Forms mit accept-charset="UTF-8"
+- Dockerfile mit deutschen Locale-Einstellungen (de_DE.UTF-8)
+- PostgreSQL Container mit UTF-8 Initialisierung
+- init.sql mit SET client_encoding = 'UTF8'
+
+**Geänderte Dateien:**
+- v2_adminpanel/app.py
+- v2_adminpanel/templates/index.html
+- v2_adminpanel/init.sql
+- v2_adminpanel/Dockerfile
+- v2/docker-compose.yaml
+
+**Nächster Test:**
+- Container neu bauen und starten
+- Kundennamen mit Umlauten testen (z.B. "Müller GmbH", "Björn Schäfer")
+- Email mit Umlauten testen
\ No newline at end of file
diff --git a/v2/docker-compose.yaml b/v2/docker-compose.yaml
index 9535713..7ce4f8e 100644
--- a/v2/docker-compose.yaml
+++ b/v2/docker-compose.yaml
@@ -8,6 +8,9 @@ services:
     env_file: .env
     environment:
       POSTGRES_HOST: postgres
+      POSTGRES_INITDB_ARGS: '--encoding=UTF8 --locale=de_DE.UTF-8'
+      POSTGRES_COLLATE: 'de_DE.UTF-8'
+      POSTGRES_CTYPE: 'de_DE.UTF-8'
     volumes:
       # Persistente Speicherung der Datenbank auf dem Windows-Host
       - postgres_data:/var/lib/postgresql/data
diff --git a/v2_adminpanel/Dockerfile b/v2_adminpanel/Dockerfile
index 345ccad..fa620d5 100644
--- a/v2_adminpanel/Dockerfile
+++ b/v2_adminpanel/Dockerfile
@@ -1,5 +1,10 @@
 FROM python:3.11-slim
 
+# Locale für deutsche Sprache und UTF-8 setzen
+ENV LANG=de_DE.UTF-8
+ENV LC_ALL=de_DE.UTF-8
+ENV PYTHONIOENCODING=utf-8
+
 WORKDIR /app
 
 COPY requirements.txt .
diff --git a/v2_adminpanel/app.py b/v2_adminpanel/app.py
index b20d420..f4e801a 100644
--- a/v2_adminpanel/app.py
+++ b/v2_adminpanel/app.py
@@ -10,6 +10,8 @@ load_dotenv()
 app = Flask(__name__)
 app.config['SECRET_KEY'] = os.urandom(24)
 app.config['SESSION_TYPE'] = 'filesystem'
+app.config['JSON_AS_ASCII'] = False  # JSON-Ausgabe mit UTF-8
+app.config['JSONIFY_MIMETYPE'] = 'application/json; charset=utf-8'
 Session(app)
 
 # Login decorator
@@ -21,15 +23,18 @@ def login_required(f):
         return f(*args, **kwargs)
     return decorated_function
 
-# DB-Verbindung
+# DB-Verbindung mit UTF-8 Encoding
 def get_connection():
-    return psycopg2.connect(
+    conn = psycopg2.connect(
         host=os.getenv("POSTGRES_HOST", "postgres"),
         port=os.getenv("POSTGRES_PORT", "5432"),
         dbname=os.getenv("POSTGRES_DB"),
         user=os.getenv("POSTGRES_USER"),
-        password=os.getenv("POSTGRES_PASSWORD")
+        password=os.getenv("POSTGRES_PASSWORD"),
+        options='-c client_encoding=UTF8'
     )
+    conn.set_client_encoding('UTF8')
+    return conn
 
 @app.route("/login", methods=["GET", "POST"])
 def login():
diff --git a/v2_adminpanel/init.sql b/v2_adminpanel/init.sql
index 25f8d2c..abf57a1 100644
--- a/v2_adminpanel/init.sql
+++ b/v2_adminpanel/init.sql
@@ -1,3 +1,6 @@
+-- UTF-8 Encoding für deutsche Sonderzeichen sicherstellen
+SET client_encoding = 'UTF8';
+
 CREATE TABLE IF NOT EXISTS customers (
     id SERIAL PRIMARY KEY,
     name TEXT NOT NULL,
diff --git a/v2_adminpanel/templates/index.html b/v2_adminpanel/templates/index.html
index 201e429..7727bc2 100644
--- a/v2_adminpanel/templates/index.html
+++ b/v2_adminpanel/templates/index.html
@@ -19,15 +19,15 @@
 <div class="container py-5">
     <h2 class="mb-4">Neue Lizenz erstellen</h2>
 
-    <form method="post" action="/">
+    <form method="post" action="/" accept-charset="UTF-8">
         <div class="row g-3">
             <div class="col-md-6">
                 <label for="customerName" class="form-label">Kundenname</label>
-                <input type="text" class="form-control" id="customerName" name="customer_name" required>
+                <input type="text" class="form-control" id="customerName" name="customer_name" accept-charset="UTF-8" required>
             </div>
             <div class="col-md-6">
                 <label for="email" class="form-label">E-Mail</label>
-                <input type="email" class="form-control" id="email" name="email">
+                <input type="email" class="form-control" id="email" name="email" accept-charset="UTF-8">
             </div>
             <div class="col-md-4">
                 <label for="licenseKey" class="form-label">Lizenzschlüssel</label>
diff --git a/v2_testing/test_utf8_umlaute.py b/v2_testing/test_utf8_umlaute.py
new file mode 100644
index 0000000..5041fd1
--- /dev/null
+++ b/v2_testing/test_utf8_umlaute.py
@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+import requests
+import urllib3
+from datetime import datetime, timedelta
+
+# Disable SSL warnings for self-signed certificate
+urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
+
+# Test configuration
+base_url = "https://localhost:443"
+admin_user = {"username": "rac00n", "password": "1248163264"}
+
+def test_umlaut_support():
+    """Test UTF-8 support with German umlauts"""
+    session = requests.Session()
+    
+    # Login first
+    login_data = {
+        "username": admin_user["username"],
+        "password": admin_user["password"]
+    }
+    
+    response = session.post(f"{base_url}/login", data=login_data, verify=False, allow_redirects=False)
+    if response.status_code != 302:
+        return "Failed to login"
+    
+    # Create test data with German umlauts
+    test_customers = [
+        {
+            "customer_name": "Müller GmbH & Co. KG",
+            "email": "kontakt@müller-gmbh.de",
+            "license_key": "MÜLLER-2025-ÄÖÜ",
+            "license_type": "Premium-Größe",
+            "valid_from": datetime.now().strftime("%Y-%m-%d"),
+            "valid_until": (datetime.now() + timedelta(days=365)).strftime("%Y-%m-%d")
+        },
+        {
+            "customer_name": "Schröder Süßwaren AG",
+            "email": "info@schröder-süßwaren.de",
+            "license_key": "SCHRÖDER-2025-ßÄÖÜ",
+            "license_type": "Geschäftskunden",
+            "valid_from": datetime.now().strftime("%Y-%m-%d"),
+            "valid_until": (datetime.now() + timedelta(days=180)).strftime("%Y-%m-%d")
+        },
+        {
+            "customer_name": "Björn Köhler Einzelunternehmen",
+            "email": "björn.köhler@übersetzungen.de",
+            "license_key": "KÖHLER-2025-BJÖRN",
+            "license_type": "Übersetzungsbüro",
+            "valid_from": datetime.now().strftime("%Y-%m-%d"),
+            "valid_until": (datetime.now() + timedelta(days=90)).strftime("%Y-%m-%d")
+        }
+    ]
+    
+    results = []
+    for customer in test_customers:
+        response = session.post(f"{base_url}/", data=customer, verify=False, allow_redirects=False)
+        
+        if response.status_code == 302 and response.headers.get('Location') == '/':
+            results.append(f"✓ Created: {customer['customer_name']}")
+        else:
+            results.append(f"✗ Failed: {customer['customer_name']} - Status: {response.status_code}")
+    
+    return results
+
+print("Testing UTF-8 German Umlaut Support")
+print("=" * 50)
+print("Creating customers with special characters: ä, ö, ü, ß, Ä, Ö, Ü")
+print("-" * 50)
+
+results = test_umlaut_support()
+for result in results:
+    print(result)
+
+# Verify the data in the database
+print("\n" + "=" * 50)
+print("Verifying database entries:")
+print("-" * 50)
+
+import subprocess
+result = subprocess.run([
+    "docker", "exec", "db", "psql", "-U", "adminuser", "-d", "meinedatenbank", 
+    "-c", "SELECT c.name, c.email, l.license_key, l.license_type FROM licenses l JOIN customers c ON l.customer_id = c.id ORDER BY c.id DESC LIMIT 3;"
+], capture_output=True, text=True)
+
+print(result.stdout)
+
+# Test direct database insertion with umlauts
+print("Direct database test with umlauts:")
+print("-" * 50)
+
+test_query = """
+INSERT INTO customers (name, email) VALUES ('Testfirma für Umlaute: äöüßÄÖÜ', 'test@überprüfung.de') RETURNING name, email;
+"""
+
+result = subprocess.run([
+    "docker", "exec", "db", "psql", "-U", "adminuser", "-d", "meinedatenbank", 
+    "-c", test_query
+], capture_output=True, text=True)
+
+print(result.stdout)
\ No newline at end of file