diff --git a/questionpy_sdk/webserver/context.py b/questionpy_sdk/webserver/context.py
index 2af9363..336865d 100644
--- a/questionpy_sdk/webserver/context.py
+++ b/questionpy_sdk/webserver/context.py
@@ -8,6 +8,7 @@
     CheckboxElement,
     CheckboxGroupElement,
     FormElement,
+    GeneratedIdElement,
     GroupElement,
     HiddenElement,
     OptionsFormDefinition,
@@ -23,6 +24,7 @@
     CxdCheckboxGroupElement,
     CxdFormElement,
     CxdFormSection,
+    CxdGeneratedIdElement,
     CxdGroupElement,
     CxdHiddenElement,
     CxdOptionsFormDefinition,
@@ -43,6 +45,7 @@
     RadioGroupElement: CxdRadioGroupElement,
     SelectElement: CxdSelectElement,
     HiddenElement: CxdHiddenElement,
+    GeneratedIdElement: CxdGeneratedIdElement,
 }
 
 
diff --git a/questionpy_sdk/webserver/elements.py b/questionpy_sdk/webserver/elements.py
index 8bc4cd4..d0abd89 100644
--- a/questionpy_sdk/webserver/elements.py
+++ b/questionpy_sdk/webserver/elements.py
@@ -4,6 +4,7 @@
 
 from re import Pattern, sub
 from typing import Annotated, Any, TypeAlias
+from uuid import uuid4
 
 from pydantic import BaseModel, Field, computed_field
 
@@ -12,6 +13,7 @@
     CheckboxGroupElement,
     FormElement,  # noqa: F401
     FormSection,
+    GeneratedIdElement,
     GroupElement,
     HiddenElement,
     Option,
@@ -212,6 +214,16 @@ def __init__(self, **data: Any):
         super().__init__(**data, elements=[])
 
 
+class CxdGeneratedIdElement(GeneratedIdElement, _CxdFormElement):
+    cxd_value: str | None = None
+
+    def add_form_data_value(self, element_form_data: Any) -> None:
+        if element_form_data:
+            self.cxd_value = element_form_data
+        else:
+            self.cxd_value = str(uuid4())
+
+
 CxdFormElement: TypeAlias = Annotated[
     CxdStaticTextElement
     | CxdTextInputElement
@@ -222,7 +234,8 @@ def __init__(self, **data: Any):
     | CxdSelectElement
     | CxdHiddenElement
     | CxdGroupElement
-    | CxdRepetitionElement,
+    | CxdRepetitionElement
+    | CxdGeneratedIdElement,
     Field(discriminator="kind"),
 ]
 
diff --git a/questionpy_sdk/webserver/routes/options.py b/questionpy_sdk/webserver/routes/options.py
index 706a694..a438e62 100644
--- a/questionpy_sdk/webserver/routes/options.py
+++ b/questionpy_sdk/webserver/routes/options.py
@@ -1,9 +1,9 @@
 #  This file is part of the QuestionPy SDK. (https://questionpy.org)
 #  The QuestionPy SDK is free software released under terms of the MIT license. See LICENSE.md.
 #  (c) Technische Universität Berlin, innoCampus <info@isis.tu-berlin.de>
-
 from http.client import UNPROCESSABLE_ENTITY
 from typing import TYPE_CHECKING, Never
+from uuid import uuid4
 
 import aiohttp_jinja2
 from aiohttp import web
@@ -69,8 +69,22 @@ async def repeat_element(request: web.Request) -> web.Response:
     data = await request.json()
     question_form_data = parse_form_data(data["form_data"])
     repetition_list = get_nested_form_data(question_form_data, data["repetition_name"])
-    if isinstance(repetition_list, list) and "increment" in data:
-        repetition_list.extend([repetition_list[-1]] * int(data["increment"]))
+
+    if not isinstance(repetition_list, list) or "increment" not in data:
+        raise web.HTTPUnprocessableEntity
+
+    new_repetition_items: list[dict] = [repetition_list[-1].copy() for _ in range(int(data["increment"]))]
+    # ID elements must be unique, so new items need a new value.
+    for new_repetition_item in new_repetition_items:
+        id_element_names = new_repetition_item.get("qpy_id_elements")
+        if not isinstance(id_element_names, list):
+            continue
+
+        for id_element_name in id_element_names:
+            if id_element_name in new_repetition_item:
+                new_repetition_item[id_element_name] = str(uuid4())
+
+    repetition_list.extend(new_repetition_items)
 
     try:
         await _save_updated_form_data(question_form_data, webserver)
diff --git a/questionpy_sdk/webserver/templates/elements/id.html.jinja2 b/questionpy_sdk/webserver/templates/elements/id.html.jinja2
new file mode 100644
index 0000000..35cee5b
--- /dev/null
+++ b/questionpy_sdk/webserver/templates/elements/id.html.jinja2
@@ -0,0 +1,4 @@
+<input type="hidden" name="{{ element_reference }}"
+       value="{{ element.cxd_value }}" id="{{ element.id }}">
+<input type="hidden" name="{{ path_list_to_string(element.path[:-1] + ['qpy_id_elements']) + "_[]" }}"
+       value="{{ element.name }}">