diff --git a/pyproject.toml b/pyproject.toml
index f9ee93f..2bdc5de 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "pdfrest"
-version = "1.0.3"
+version = "1.1.0"
 description = "Python client library for interacting with the pdfRest API"
 readme = {file = "README.md", content-type = "text/markdown"}
 authors = [
diff --git a/src/pdfrest/client.py b/src/pdfrest/client.py
index 7c66e19..b06a306 100644
--- a/src/pdfrest/client.py
+++ b/src/pdfrest/client.py
@@ -956,7 +956,11 @@ def _extract_error_details(
             pdfrest_error = PdfRestErrorResponse.model_validate_json(response.content)
         except ValidationError:
             return None, response.text
-        return pdfrest_error.error, None
+        error_detail = pdfrest_error.error_detail
+        if error_detail is None:
+            return pdfrest_error.error, None
+        error_payload = error_detail.model_dump(by_alias=True, exclude_none=True)
+        return pdfrest_error.error, error_payload
 
 
 class _SyncApiClient(_BaseApiClient[httpx.Client]):
diff --git a/src/pdfrest/models/__init__.py b/src/pdfrest/models/__init__.py
index 2ed9563..62a5814 100644
--- a/src/pdfrest/models/__init__.py
+++ b/src/pdfrest/models/__init__.py
@@ -13,6 +13,8 @@
     ExtractedTextWordStyle,
     ExtractTextResponse,
     PdfRestDeletionResponse,
+    PdfRestErrorDetail,
+    PdfRestErrorIssue,
     PdfRestErrorResponse,
     PdfRestFile,
     PdfRestFileBasedResponse,
@@ -37,6 +39,8 @@
     "ExtractedTextWordFont",
     "ExtractedTextWordStyle",
     "PdfRestDeletionResponse",
+    "PdfRestErrorDetail",
+    "PdfRestErrorIssue",
     "PdfRestErrorResponse",
     "PdfRestFile",
     "PdfRestFileBasedResponse",
diff --git a/src/pdfrest/models/public.py b/src/pdfrest/models/public.py
index 26ff77b..cef741f 100644
--- a/src/pdfrest/models/public.py
+++ b/src/pdfrest/models/public.py
@@ -40,6 +40,8 @@
     "ExtractedTextWordFont",
     "ExtractedTextWordStyle",
     "PdfRestDeletionResponse",
+    "PdfRestErrorDetail",
+    "PdfRestErrorIssue",
     "PdfRestErrorResponse",
     "PdfRestFile",
     "PdfRestFileBasedResponse",
@@ -246,9 +248,33 @@ class UpResponse(BaseModel):
 class PdfRestErrorResponse(BaseModel):
     """Error response payloads from pdfRest."""
 
-    error: str | None = Field(alias="message")
+    error: str | None = Field(validation_alias=AliasChoices("error", "message"))
     """Human-readable error message returned by the API."""
 
+    error_detail: PdfRestErrorDetail | None = Field(default=None, alias="errorDetail")
+    """Structured validation issues returned by the API when available."""
+
+    model_config = ConfigDict(extra="allow", frozen=True)
+
+
+class PdfRestErrorIssue(BaseModel):
+    """Single issue entry inside an `errorDetail` response."""
+
+    path: str
+    message: str
+    minimum: int | float | None = None
+    maximum: int | float | None = None
+    expected: str | None = None
+    received: Any | None = None
+
+    model_config = ConfigDict(extra="allow", frozen=True)
+
+
+class PdfRestErrorDetail(BaseModel):
+    """Structured details for API validation errors."""
+
+    issues: list[PdfRestErrorIssue] = Field(default_factory=list)
+
     model_config = ConfigDict(extra="allow", frozen=True)
 
 
diff --git a/tests/test_client.py b/tests/test_client.py
index c0380c9..d9b11cf 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -55,6 +55,30 @@ def _build_file_info(
     }
 
 
+def _build_error_detail_response() -> dict[str, Any]:
+    return {
+        "error": "-.8 is not within the acceptable range for opacity",
+        "errorDetail": {
+            "issues": [
+                {
+                    "path": "fields.text_objects[0].opacity",
+                    "message": "Too small: expected number to be >=0",
+                    "minimum": 0,
+                    "maximum": 1,
+                },
+                {
+                    "path": "fields.text_objects[0].text_color_cmyk[2]",
+                    "message": (
+                        'Invalid text_color_cmyk yellow value "foo" (expected 0-100).'
+                    ),
+                    "minimum": 0,
+                    "maximum": 100,
+                },
+            ]
+        },
+    }
+
+
 class NonSeekableByteStream(BytesIO):
     def __init__(self, payload: bytes) -> None:
         super().__init__(payload)
@@ -939,6 +963,30 @@ def handler(_: httpx.Request) -> httpx.Response:
     assert exc_info.value.status_code == 500
 
 
+def test_client_preserves_structured_error_detail(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setenv("PDFREST_API_KEY", VALID_API_KEY)
+    error_payload = _build_error_detail_response()
+
+    def handler(_: httpx.Request) -> httpx.Response:
+        return httpx.Response(400, json=error_payload)
+
+    transport = httpx.MockTransport(handler)
+    with (
+        pytest.raises(PdfRestApiError, match=r"acceptable range for opacity") as exc,
+        PdfRestClient(transport=transport) as client,
+    ):
+        client.up()
+
+    assert exc.value.status_code == 400
+    assert exc.value.response_content == error_payload["errorDetail"]
+    assert isinstance(exc.value.response_content, dict)
+    issues = exc.value.response_content["issues"]
+    assert issues[0]["path"] == "fields.text_objects[0].opacity"
+    assert issues[1]["path"] == "fields.text_objects[0].text_color_cmyk[2]"
+
+
 @pytest.mark.asyncio
 async def test_async_client_up(monkeypatch: pytest.MonkeyPatch) -> None:
     monkeypatch.setenv("PDFREST_API_KEY", ASYNC_API_KEY)
@@ -954,6 +1002,31 @@ def handler(request: httpx.Request) -> httpx.Response:
     assert response.status == "OK"
 
 
+@pytest.mark.asyncio
+async def test_async_client_preserves_structured_error_detail(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setenv("PDFREST_API_KEY", ASYNC_API_KEY)
+    error_payload = _build_error_detail_response()
+
+    def handler(_: httpx.Request) -> httpx.Response:
+        return httpx.Response(400, json=error_payload)
+
+    transport = httpx.MockTransport(handler)
+    async with AsyncPdfRestClient(transport=transport) as client:
+        with pytest.raises(
+            PdfRestApiError, match=r"acceptable range for opacity"
+        ) as exc:
+            await client.up()
+
+    assert exc.value.status_code == 400
+    assert exc.value.response_content == error_payload["errorDetail"]
+    assert isinstance(exc.value.response_content, dict)
+    issues = exc.value.response_content["issues"]
+    assert issues[0]["path"] == "fields.text_objects[0].opacity"
+    assert issues[1]["path"] == "fields.text_objects[0].text_color_cmyk[2]"
+
+
 @pytest.mark.asyncio
 async def test_async_up_with_query_and_timeout(
     monkeypatch: pytest.MonkeyPatch,
diff --git a/uv.lock b/uv.lock
index ad017ec..24a7394 100644
--- a/uv.lock
+++ b/uv.lock
@@ -961,7 +961,7 @@ wheels = [
 
 [[package]]
 name = "pdfrest"
-version = "1.0.3"
+version = "1.1.0"
 source = { editable = "." }
 dependencies = [
     { name = "exceptiongroup" },