diff --git a/utils/profile_export_service.py b/utils/profile_export_service.py
index 7cba9cc..dc37645 100644
--- a/utils/profile_export_service.py
+++ b/utils/profile_export_service.py
@@ -1,11 +1,12 @@
 """
 Profil-Export-Service für Account-Daten
 
-Exportiert Account-Profile in verschiedene Formate (CSV, TXT, PDF).
+Exportiert Account-Profile in verschiedene Formate (CSV, JSON, PDF).
 """
 
 import os
 import csv
+import json
 import string
 import logging
 from io import BytesIO, StringIO
@@ -106,6 +107,50 @@ class ProfileExportService:
             logger.error(f"Fehler beim TXT-Export: {e}")
             raise
 
+    @staticmethod
+    def export_to_json(account_data: Dict[str, Any]) -> bytes:
+        """
+        Exportiert Account-Daten als JSON.
+
+        Args:
+            account_data: Dictionary mit Account-Daten
+
+        Returns:
+            JSON-Daten als bytes
+        """
+        try:
+            # JSON-Struktur aufbauen
+            export_data = {
+                "account": {
+                    field_key: account_data.get(field_key, "")
+                    for field_key in ProfileExportService.EXPORT_FIELDS.keys()
+                },
+                "export_info": {
+                    "exported_at": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
+                    "format_version": "1.0"
+                }
+            }
+
+            # None-Werte zu leeren Strings konvertieren
+            for key, value in export_data["account"].items():
+                if value is None:
+                    export_data["account"][key] = ""
+
+            # JSON mit Einrückung für Lesbarkeit
+            json_content = json.dumps(
+                export_data,
+                ensure_ascii=False,
+                indent=2,
+                sort_keys=False
+            )
+
+            logger.info("JSON-Export erfolgreich")
+            return json_content.encode('utf-8')
+
+        except Exception as e:
+            logger.error(f"Fehler beim JSON-Export: {e}")
+            raise
+
     @staticmethod
     def export_to_pdf(account_data: Dict[str, Any]) -> bytes:
         """
@@ -349,7 +394,7 @@ class ProfileExportService:
 
         Args:
             account_data: Account-Daten zum Exportieren
-            formats: Liste von Formaten ["csv", "txt", "pdf"]
+            formats: Liste von Formaten ["csv", "json", "pdf"]
             password_protect: Wird ignoriert (für Rückwärtskompatibilität)
 
         Returns:
@@ -366,9 +411,9 @@ class ProfileExportService:
                 filename = ProfileExportService.generate_filename(account_data, "csv")
                 files_dict[filename] = content
 
-            elif fmt == "txt":
-                content = ProfileExportService.export_to_txt(account_data)
-                filename = ProfileExportService.generate_filename(account_data, "txt")
+            elif fmt == "json":
+                content = ProfileExportService.export_to_json(account_data)
+                filename = ProfileExportService.generate_filename(account_data, "json")
                 files_dict[filename] = content
 
             elif fmt == "pdf":
diff --git a/views/dialogs/profile_export_dialog.py b/views/dialogs/profile_export_dialog.py
index f989cfe..ad9b54f 100644
--- a/views/dialogs/profile_export_dialog.py
+++ b/views/dialogs/profile_export_dialog.py
@@ -138,9 +138,9 @@ class ProfileExportDialog(QDialog):
             }
         """)
 
-        self.txt_checkbox = QCheckBox("TXT")
-        self.txt_checkbox.setChecked(False)  # Standard: nicht aktiviert
-        self.txt_checkbox.setStyleSheet(self.csv_checkbox.styleSheet())
+        self.json_checkbox = QCheckBox("JSON")
+        self.json_checkbox.setChecked(False)  # Standard: nicht aktiviert
+        self.json_checkbox.setStyleSheet(self.csv_checkbox.styleSheet())
 
         self.pdf_checkbox = QCheckBox("PDF")
         self.pdf_checkbox.setChecked(False)  # Standard: nicht aktiviert
@@ -148,7 +148,7 @@ class ProfileExportDialog(QDialog):
 
         # Checkboxen zum Format-Layout hinzufügen
         format_layout.addWidget(self.csv_checkbox)
-        format_layout.addWidget(self.txt_checkbox)
+        format_layout.addWidget(self.json_checkbox)
         format_layout.addWidget(self.pdf_checkbox)
 
         container_layout.addWidget(format_group)
@@ -226,8 +226,8 @@ class ProfileExportDialog(QDialog):
         selected_formats = []
         if self.csv_checkbox.isChecked():
             selected_formats.append("csv")
-        if self.txt_checkbox.isChecked():
-            selected_formats.append("txt")
+        if self.json_checkbox.isChecked():
+            selected_formats.append("json")
         if self.pdf_checkbox.isChecked():
             selected_formats.append("pdf")
 
@@ -260,8 +260,8 @@ class ProfileExportDialog(QDialog):
         formats = []
         if self.csv_checkbox.isChecked():
             formats.append("csv")
-        if self.txt_checkbox.isChecked():
-            formats.append("txt")
+        if self.json_checkbox.isChecked():
+            formats.append("json")
         if self.pdf_checkbox.isChecked():
             formats.append("pdf")