diff --git a/src/documents/serialisers.py b/src/documents/serialisers.py
index 1ff3798db..7726141be 100644
--- a/src/documents/serialisers.py
+++ b/src/documents/serialisers.py
@@ -2632,11 +2632,17 @@ class RunTaskSerializer(serializers.Serializer[dict[str, str]]):
 
 class AcknowledgeTasksViewSerializer(serializers.Serializer[dict[str, Any]]):
     tasks = serializers.ListField(
-        required=True,
+        required=False,
         label="Tasks",
         write_only=True,
         child=serializers.IntegerField(),
     )
+    all = serializers.BooleanField(
+        required=False,
+        default=False,
+        label="All",
+        write_only=True,
+    )
 
     def _validate_task_id_list(self, tasks, name="tasks") -> None:
         if not isinstance(tasks, list):
@@ -2653,6 +2659,21 @@ class AcknowledgeTasksViewSerializer(serializers.Serializer[dict[str, Any]]):
         self._validate_task_id_list(tasks)
         return tasks
 
+    def validate(self, attrs):
+        acknowledge_all = attrs.get("all", False)
+        task_ids = attrs.get("tasks")
+
+        if acknowledge_all and task_ids is not None:
+            raise serializers.ValidationError(
+                "Set either all or tasks, not both.",
+            )
+        if not acknowledge_all and task_ids is None:
+            raise serializers.ValidationError(
+                "Either all must be true or tasks must be provided.",
+            )
+
+        return attrs
+
 
 class ShareLinkSerializer(OwnedObjectSerializer):
     class Meta:
diff --git a/src/documents/tests/test_api_tasks.py b/src/documents/tests/test_api_tasks.py
index f9b6c4538..42ccbab5c 100644
--- a/src/documents/tests/test_api_tasks.py
+++ b/src/documents/tests/test_api_tasks.py
@@ -522,6 +522,27 @@ class TestAcknowledge:
         assert response.status_code == status.HTTP_200_OK
         assert response.data == {"result": 2}
 
+    def test_acknowledge_all_returns_count(self, admin_client: APIClient) -> None:
+        """POST acknowledge/ with all=true acknowledges all unacknowledged tasks."""
+        unacknowledged_task1 = PaperlessTaskFactory(acknowledged=False)
+        unacknowledged_task2 = PaperlessTaskFactory(acknowledged=False)
+        acknowledged_task = PaperlessTaskFactory(acknowledged=True)
+
+        response = admin_client.post(
+            ENDPOINT + "acknowledge/",
+            {"all": True},
+            format="json",
+        )
+
+        assert response.status_code == status.HTTP_200_OK
+        assert response.data == {"result": 2}
+        unacknowledged_task1.refresh_from_db()
+        unacknowledged_task2.refresh_from_db()
+        acknowledged_task.refresh_from_db()
+        assert unacknowledged_task1.acknowledged
+        assert unacknowledged_task2.acknowledged
+        assert acknowledged_task.acknowledged
+
     def test_acknowledged_tasks_excluded_from_unacked_filter(
         self,
         admin_client: APIClient,
diff --git a/src/documents/views.py b/src/documents/views.py
index 4fc0b3f51..f2e611ae6 100644
--- a/src/documents/views.py
+++ b/src/documents/views.py
@@ -4033,7 +4033,7 @@ class _TasksViewSetSchema(AutoSchema):
     ),
     acknowledge=extend_schema(
         operation_id="acknowledge_tasks",
-        description="Acknowledge a list of tasks",
+        description="Acknowledge a list of tasks, or all visible unacknowledged tasks",
         request=AcknowledgeTasksViewSerializer,
         responses={
             (200, "application/json"): inline_serializer(
@@ -4172,8 +4172,11 @@ class TasksViewSet(ReadOnlyModelViewSet[PaperlessTask]):
     def acknowledge(self, request):
         serializer = AcknowledgeTasksViewSerializer(data=request.data)
         serializer.is_valid(raise_exception=True)
-        task_ids = serializer.validated_data.get("tasks")
-        tasks = self.get_queryset().filter(id__in=task_ids)
+        if serializer.validated_data.get("all", False):
+            tasks = self.get_queryset().filter(acknowledged=False)
+        else:
+            task_ids = serializer.validated_data.get("tasks")
+            tasks = self.get_queryset().filter(id__in=task_ids)
         count = tasks.update(acknowledged=True)
         return Response({"result": count})