diff --git a/DocuMentor.wxs b/DocuMentor.wxs
index 69b7531..b3f024f 100644
--- a/DocuMentor.wxs
+++ b/DocuMentor.wxs
@@ -4,7 +4,7 @@
   <!-- Paket-Definition (ersetzt Product in v4) -->
   <Package 
     Name="DocuMentor" 
-    Version="1.6.2"
+    Version="1.6.3"
     Manufacturer="Vitali Graf / Software- und Datenbankentwicklung" 
     UpgradeCode="F498B66C-726D-44AA-95F4-CB4FBDCEF26E"
     Language="1031"
diff --git a/THIRD_PARTY_LICENSES.txt b/THIRD_PARTY_LICENSES.txt
index ddfb23a..3c6e243 100644
--- a/THIRD_PARTY_LICENSES.txt
+++ b/THIRD_PARTY_LICENSES.txt
@@ -253,5 +253,5 @@ HINWEISE
 
 ================================================================================
 Stand: April 2026
-Erstellt für: DocuMentor v1.6.2
+Erstellt für: DocuMentor v1.6.3
 ================================================================================
diff --git a/installer.iss b/installer.iss
index fa93ffc..daf6aba 100644
--- a/installer.iss
+++ b/installer.iss
@@ -10,7 +10,7 @@
 ; Build-Befehl: iscc installer.iss
 
 #define MyAppName "DocuMentor"
-#define MyAppVersion "1.6.2"
+#define MyAppVersion "1.6.3"
 #define MyAppPublisher "Ihr Name/Organisation"
 #define MyAppURL "https://github.com/yourusername/xsl-validator"
 #define MyAppExeName "DocuMentor.exe"
diff --git a/pyproject.toml b/pyproject.toml
index 0c3017b..58d2922 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "DocuMentor"
-version = "1.6.2"
+version = "1.6.3"
 description = "Professionelle XSL-Transformations-Verwaltung und PDF-Generierung"
 readme = "README.md"
 license = {text = "MIT"}
diff --git a/src/transform.py b/src/transform.py
index a12163c..b07da63 100644
--- a/src/transform.py
+++ b/src/transform.py
@@ -9,10 +9,14 @@ Dieses Modul implementiert die Transformations-Pipeline:
 
 import logging
 import subprocess
+import sys
 from pathlib import Path
 from datetime import datetime
 from typing import Any, Optional, TYPE_CHECKING
 
+# Verhindert Konsolenfenster bei Subprozessen in PyInstaller-EXE (Windows)
+_SUBPROCESS_FLAGS = subprocess.CREATE_NO_WINDOW if sys.platform == "win32" else 0
+
 if TYPE_CHECKING:
     from saxon_pool import SaxonWorkerPool
     from saxon_pool_s9api import SaxonWorkerPoolS9Api
@@ -293,6 +297,7 @@ class TransformationJob:
                 capture_output=True,
                 text=True,
                 timeout=120,  # 2 Minuten Timeout
+                creationflags=_SUBPROCESS_FLAGS,
             )
 
             # Saxon Ausgaben loggen
@@ -409,6 +414,7 @@ class TransformationJob:
                 capture_output=True,
                 text=True,
                 timeout=180,  # 3 Minuten Timeout
+                creationflags=_SUBPROCESS_FLAGS,
             )
 
             # Apache FOP Ausgaben loggen
@@ -488,6 +494,7 @@ class TransformationJob:
                 capture_output=True,
                 text=True,
                 timeout=60,  # 1 Minute Timeout
+                creationflags=_SUBPROCESS_FLAGS,
             )
 
             if result.returncode == 0:
@@ -523,6 +530,7 @@ class TransformationJob:
                     capture_output=True,
                     text=True,
                     timeout=90,  # 1.5 Minuten Timeout
+                    creationflags=_SUBPROCESS_FLAGS,
                 )
 
                 if result_diff.returncode == 0 or self.diff_pdf.exists():
diff --git a/src/worker_pool_base.py b/src/worker_pool_base.py
index cc8e2f4..0a80cb7 100644
--- a/src/worker_pool_base.py
+++ b/src/worker_pool_base.py
@@ -17,6 +17,9 @@ from abc import ABC, abstractmethod
 from pathlib import Path
 from typing import Optional
 
+# Verhindert Konsolenfenster bei Subprozessen in PyInstaller-EXE (Windows)
+_SUBPROCESS_FLAGS = subprocess.CREATE_NO_WINDOW if sys.platform == "win32" else 0
+
 import psutil
 
 from worker_metrics import WorkerPoolMetrics
@@ -133,7 +136,7 @@ class BaseWorkerPool(ABC):
 
             logger.debug(f"Kompiliere {self._java_class_name}: {' '.join(javac_cmd[:3])}...")
 
-            result = subprocess.run(javac_cmd, capture_output=True, text=True, timeout=30)
+            result = subprocess.run(javac_cmd, capture_output=True, text=True, timeout=30, creationflags=_SUBPROCESS_FLAGS)
             if result.returncode != 0:
                 raise RuntimeError(f"Java-Kompilierung fehlgeschlagen: {result.stderr}")
 
@@ -174,6 +177,7 @@ class BaseWorkerPool(ABC):
                     stderr=stderr_file,
                     text=True,
                     bufsize=1,
+                    creationflags=_SUBPROCESS_FLAGS,
                 )
 
                 self.workers.append(process)
diff --git a/uv.lock b/uv.lock
index 38c7d32..fb43e2a 100644
--- a/uv.lock
+++ b/uv.lock
@@ -34,7 +34,7 @@ wheels = [
 
 [[package]]
 name = "documentor"
-version = "1.6.2"
+version = "1.6.3"
 source = { virtual = "." }
 dependencies = [
     { name = "connectorx" },