diff --git a/pdm.lock b/pdm.lock
index a5dbc4d..72a2fae 100644
--- a/pdm.lock
+++ b/pdm.lock
@@ -5,7 +5,7 @@
 groups = ["default", "dev"]
 strategy = ["inherit_metadata"]
 lock_version = "4.5.0"
-content_hash = "sha256:8bd6fb4ab1ba3453b86efce9f5b6ac9c7285a31cdf144db6838811cd30b6ff52"
+content_hash = "sha256:1e64ae11f0ff2b537b3583f5f1be4c070edde5e2d87795767d2b7de929d9fd28"
 
 [[metadata.targets]]
 requires_python = ">=3.10,<3.15"
@@ -45,6 +45,17 @@ files = [
     {file = "annotated_types-0.7.0.tar.gz", hash = "sha256:aff07c09a53a08bc8cfccb9c85b05f1aa9a2a6f23728d790723543408344ce89"},
 ]
 
+[[package]]
+name = "attrs"
+version = "25.4.0"
+requires_python = ">=3.9"
+summary = "Classes Without Boilerplate"
+groups = ["dev"]
+files = [
+    {file = "attrs-25.4.0-py3-none-any.whl", hash = "sha256:adcf7e2a1fb3b36ac48d97835bb6d8ade15b8dcce26aba8bf1d14847b57a3373"},
+    {file = "attrs-25.4.0.tar.gz", hash = "sha256:16d5969b87f0859ef33a48b35d55ac1be6e42ae49d5e853b597db70c35c57e11"},
+]
+
 [[package]]
 name = "autopep8"
 version = "2.3.2"
@@ -671,6 +682,37 @@ files = [
     {file = "jaraco_text-4.2.0.tar.gz", hash = "sha256:194e386aa5b15a6616019df87a6b29c00fd3c9c8b0475731b64633ca7afd495b"},
 ]
 
+[[package]]
+name = "jsonschema"
+version = "4.26.0"
+requires_python = ">=3.10"
+summary = "An implementation of JSON Schema validation for Python"
+groups = ["dev"]
+dependencies = [
+    "attrs>=22.2.0",
+    "jsonschema-specifications>=2023.03.6",
+    "referencing>=0.28.4",
+    "rpds-py>=0.25.0",
+]
+files = [
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+    {file = "jsonschema-4.26.0.tar.gz", hash = "sha256:0c26707e2efad8aa1bfc5b7ce170f3fccc2e4918ff85989ba9ffa9facb2be326"},
+]
+
+[[package]]
+name = "jsonschema-specifications"
+version = "2025.9.1"
+requires_python = ">=3.9"
+summary = "The JSON Schema meta-schemas and vocabularies, exposed as a Registry"
+groups = ["dev"]
+dependencies = [
+    "referencing>=0.31.0",
+]
+files = [
+    {file = "jsonschema_specifications-2025.9.1-py3-none-any.whl", hash = "sha256:98802fee3a11ee76ecaca44429fda8a41bff98b00a0f2838151b113f210cc6fe"},
+    {file = "jsonschema_specifications-2025.9.1.tar.gz", hash = "sha256:b540987f239e745613c7a9176f3edb72b832a4ac465cf02712288397832b5e8d"},
+]
+
 [[package]]
 name = "librt"
 version = "0.8.1"
@@ -1518,6 +1560,22 @@ files = [
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 ]
 
+[[package]]
+name = "referencing"
+version = "0.37.0"
+requires_python = ">=3.10"
+summary = "JSON Referencing + Python"
+groups = ["dev"]
+dependencies = [
+    "attrs>=22.2.0",
+    "rpds-py>=0.7.0",
+    "typing-extensions>=4.4.0; python_version < \"3.13\"",
+]
+files = [
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+    {file = "referencing-0.37.0.tar.gz", hash = "sha256:44aefc3142c5b842538163acb373e24cce6632bd54bdb01b21ad5863489f50d8"},
+]
+
 [[package]]
 name = "requests"
 version = "2.32.5"
@@ -1550,6 +1608,130 @@ files = [
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 ]
 
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+name = "rpds-py"
+version = "0.30.0"
+requires_python = ">=3.10"
+summary = "Python bindings to Rust's persistent data structures (rpds)"
+groups = ["dev"]
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+]
+
 [[package]]
 name = "ruamel-yaml"
 version = "0.19.1"
diff --git a/pyproject.toml b/pyproject.toml
index 0f9a50a..7e17f3d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -63,6 +63,7 @@ dev = [
     "pyinstaller",
     "types-requests>=2.32.0.20250515",
     "pytest-mock>=3.14.0",
+    "jsonschema>=4.26.0",
 ]
 
 [project.urls]
diff --git a/src/kleinanzeigen_bot/extract.py b/src/kleinanzeigen_bot/extract.py
index 2b74be4..64c0fcf 100644
--- a/src/kleinanzeigen_bot/extract.py
+++ b/src/kleinanzeigen_bot/extract.py
@@ -65,7 +65,7 @@ class AdExtractor(WebScrapingMixin):
         header_string = (
             "# yaml-language-server: $schema=https://raw.githubusercontent.com/Second-Hand-Friends/kleinanzeigen-bot/refs/heads/main/schemas/ad.schema.json"
         )
-        await asyncio.get_running_loop().run_in_executor(None, lambda: dicts.save_dict(ad_file_path, ad_cfg.model_dump(), header = header_string))
+        await asyncio.get_running_loop().run_in_executor(None, lambda: dicts.save_dict(ad_file_path, ad_cfg.model_dump(mode = "json"), header = header_string))
 
     @staticmethod
     def _download_and_save_image_sync(url:str, directory:str, filename_prefix:str, img_nr:int) -> str | None:
diff --git a/tests/unit/test_extract.py b/tests/unit/test_extract.py
index b61ac8d..32efc91 100644
--- a/tests/unit/test_extract.py
+++ b/tests/unit/test_extract.py
@@ -2,19 +2,28 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 # SPDX-ArtifactOfProjectHomePage: https://github.com/Second-Hand-Friends/kleinanzeigen-bot/
 import json  # isort: skip
+import asyncio
 from gettext import gettext as _
 from pathlib import Path
-from typing import Any, TypedDict
+from typing import Any, Final, TypedDict
 from unittest.mock import AsyncMock, MagicMock, call, patch
 from urllib.error import URLError
 
 import pytest
+from jsonschema import Draft202012Validator
+from ruamel.yaml import YAML
 
 import kleinanzeigen_bot.extract as extract_module
 from kleinanzeigen_bot.model.ad_model import AdPartial, ContactPartial
 from kleinanzeigen_bot.model.config_model import Config, DownloadConfig
 from kleinanzeigen_bot.utils.web_scraping_mixin import Browser, By, Element
 
+SCHEMA_PATH:Final[Path] = Path(__file__).resolve().parents[2] / "schemas" / "ad.schema.json"
+
+
+def _read_text_file(path:Path) -> str:
+    return path.read_text(encoding = "utf-8")
+
 
 class _DimensionsDict(TypedDict):
     ad_attributes:str
@@ -1255,7 +1264,38 @@ class TestAdExtractorDownload:
             actual_call = mock_save_dict.call_args
             actual_path = Path(actual_call[0][0])
             assert actual_path == yaml_path
-            assert actual_call[0][1] == mock_extract_with_dir.return_value[0].model_dump()
+            assert actual_call[0][1] == mock_extract_with_dir.return_value[0].model_dump(mode = "json")
+
+    @pytest.mark.asyncio
+    async def test_download_ad_writes_schema_compliant_yaml(self, extractor:extract_module.AdExtractor, tmp_path:Path) -> None:
+        """Test that downloaded ad YAML validates against ad.schema.json."""
+        download_base = tmp_path / "downloaded-ads"
+        final_dir = download_base / "ad_12345_Test Advertisement Title"
+        yaml_path = final_dir / "ad_12345.yaml"
+        extractor.download_dir = download_base
+
+        with patch.object(extractor, "_extract_ad_page_info_with_directory_handling", new_callable = AsyncMock) as mock_extract_with_dir:
+            mock_extract_with_dir.return_value = (
+                AdPartial.model_validate(
+                    {
+                        "title": "Test Advertisement Title",
+                        "description": "Test Description",
+                        "category": "Dienstleistungen",
+                        "created_on": "2026-03-08T00:00:00+01:00",
+                        "updated_on": "2026-03-09T01:02:03+01:00",
+                    }
+                ),
+                final_dir,
+            )
+
+            await extractor.download_ad(12345)
+
+        loaded_ad = YAML(typ = "safe").load(await asyncio.to_thread(_read_text_file, yaml_path))
+        schema = json.loads(await asyncio.to_thread(_read_text_file, SCHEMA_PATH))
+
+        Draft202012Validator(schema).validate(loaded_ad)
+        assert isinstance(loaded_ad["created_on"], str)
+        assert isinstance(loaded_ad["updated_on"], str)
 
     @pytest.mark.asyncio
     # pylint: disable=protected-access