diff --git a/src/Ingest/DocumentSanitizer.php b/src/Ingest/DocumentSanitizer.php
index 9a89f38..cc802c1 100644
--- a/src/Ingest/DocumentSanitizer.php
+++ b/src/Ingest/DocumentSanitizer.php
@@ -24,7 +24,10 @@ final class DocumentSanitizer
     private const MAX_HEADER_LEN = 120;
     private const REPEAT_HEADER_MIN_COUNT = 3;
 
-    public function sanitize(string $text): string
+    public function sanitize(
+        string $text,
+        string $fileExtension
+    ): string
     {
         if ($text === '') {
             return '';
@@ -32,12 +35,14 @@ final class DocumentSanitizer
 
         $text = $this->normalizeLineEndings($text);
 
-        // Wichtig: Reihenfolge so, dass wir erst "grobe Blöcke" (TOC) entfernen,
-        // danach zeilenbasierte Artefakte (PageNumbers/Headers/DotLeaders).
-        $text = $this->removeToc($text);
-        $text = $this->removePageNumbers($text);
-        $text = $this->removeDotLeaderLines($text);
-        $text = $this->removeRepeatedHeaders($text);
+        $fileExtension = strtolower($fileExtension);
+
+        if (in_array($fileExtension, ['pdf', 'doc', 'docx'], true)) {
+            $text = $this->removeToc($text);
+            $text = $this->removePageNumbers($text);
+            $text = $this->removeDotLeaderLines($text);
+            $text = $this->removeRepeatedHeaders($text);
+        }
 
         $text = $this->cleanupWhitespace($text);
 
diff --git a/src/Knowledge/Ingest/KnowledgeIngestService.php b/src/Knowledge/Ingest/KnowledgeIngestService.php
index 41da161..f72ac82 100644
--- a/src/Knowledge/Ingest/KnowledgeIngestService.php
+++ b/src/Knowledge/Ingest/KnowledgeIngestService.php
@@ -32,9 +32,13 @@ final readonly class KnowledgeIngestService
     {
         // 1️⃣ Rohtext laden
         $text = $this->loader->load($version->getFilePath());
+        $extension = $version->getFileExtension() ?? 'txt';
 
         // 2️⃣ Deterministische Textbereinigung
-        $text = $this->documentSanitizer->sanitize($text);
+        $text = $this->documentSanitizer->sanitize(
+            $text,
+            $extension
+        );
 
         // 3️⃣ 🔥 Deterministische Struktur-Anreicherung (NEU)
         $text = $this->structureEnhancer->enhance($text);