diff --git a/doc/_toc.yml b/doc/_toc.yml
index 75f77d7fb..0845047cf 100644
--- a/doc/_toc.yml
+++ b/doc/_toc.yml
@@ -139,6 +139,7 @@ chapters:
       sections:
       - file: code/registry/1_class_registry
       - file: code/registry/2_instance_registry
+    - file: code/gui/0_gui
     - file: code/front_end/0_front_end
       sections:
       - file: code/front_end/1_pyrit_scan
diff --git a/doc/code/converters/7_human_converter.ipynb b/doc/code/converters/7_human_converter.ipynb
index 4107b20e9..b55646d51 100644
--- a/doc/code/converters/7_human_converter.ipynb
+++ b/doc/code/converters/7_human_converter.ipynb
@@ -5,6 +5,9 @@
    "id": "0",
    "metadata": {},
    "source": [
+    "> ⚠️ **Deprecated:** The `HumanInTheLoopConverter` is deprecated and will be removed in PyRIT v0.13.0.\n",
+    "> Use the React-based GUI (CoPyRIT) instead. See the [GUI documentation](../gui/0_gui.md) for details.\n",
+    "\n",
     "# 7. Human in the Loop Converter\n",
     "\n",
     "The Human in the Loop Converter allows a user to review each prompt before sending it to a target, allowing for closer moderation of multi-turn conversations.\n",
diff --git a/doc/code/converters/7_human_converter.py b/doc/code/converters/7_human_converter.py
index ea67c61ad..9da06433a 100644
--- a/doc/code/converters/7_human_converter.py
+++ b/doc/code/converters/7_human_converter.py
@@ -9,6 +9,9 @@
 # ---
 
 # %% [markdown]
+# > ⚠️ **Deprecated:** The `HumanInTheLoopConverter` is deprecated and will be removed in PyRIT v0.13.0.
+# > Use the React-based GUI (CoPyRIT) instead. See the [GUI documentation](../gui/0_gui.md) for details.
+#
 # # 7. Human in the Loop Converter
 #
 # The Human in the Loop Converter allows a user to review each prompt before sending it to a target, allowing for closer moderation of multi-turn conversations.
diff --git a/doc/code/gui/0_gui.md b/doc/code/gui/0_gui.md
new file mode 100644
index 000000000..174f70d9e
--- /dev/null
+++ b/doc/code/gui/0_gui.md
@@ -0,0 +1,27 @@
+# PyRIT GUI (CoPyRIT)
+
+CoPyRIT is a web-based graphical interface for PyRIT built with React and Fluent UI. It provides an interactive way to run attacks, configure targets and converters, and view results — all from a browser.
+
+> **Note:** The older Gradio-based GUI (`HumanInTheLoopScorerGradio`) and the `HumanInTheLoopConverter` are deprecated and will be removed in v0.13.0. CoPyRIT covers a much broader part of the user journey — from attack creation and converter configuration to attack history and result analysis — making these limited interactive components obsolete.
+
+## Getting Started
+
+There are several ways to run CoPyRIT:
+
+### PyRIT Backend CLI
+
+If you have PyRIT installed, use the `pyrit_backend` command to start the server. The bundled frontend is served automatically.
+
+```bash
+pyrit_backend
+```
+
+Then open `http://localhost:8000` in your browser.
+
+### Docker
+
+CoPyRIT is also available as a Docker container. See the [Docker setup](https://github.com/Azure/PyRIT/blob/main/docker/) for details.
+
+### Azure Deployment
+
+Azure-hosted deployment is planned for the near future.
diff --git a/doc/code/scoring/5_human_in_the_loop_scorer.ipynb b/doc/code/scoring/5_human_in_the_loop_scorer.ipynb
index a7aee337d..6026d49cd 100644
--- a/doc/code/scoring/5_human_in_the_loop_scorer.ipynb
+++ b/doc/code/scoring/5_human_in_the_loop_scorer.ipynb
@@ -5,6 +5,9 @@
    "id": "0",
    "metadata": {},
    "source": [
+    "> ⚠️ **Deprecated:** The `HumanInTheLoopScorerGradio` is deprecated and will be removed in PyRIT v0.13.0.\n",
+    "> Use the React-based GUI (CoPyRIT) instead. See the [GUI documentation](../gui/0_gui.md) for details.\n",
+    "\n",
     "# 5. Human in the Loop Scoring with Gradio\n",
     "This example shows how to use the Gradio UI to perform human-in-the-loop scoring. This is in beta but will be extended."
    ]
diff --git a/doc/code/scoring/5_human_in_the_loop_scorer.py b/doc/code/scoring/5_human_in_the_loop_scorer.py
index 9cc6f6e03..e8abf47a1 100644
--- a/doc/code/scoring/5_human_in_the_loop_scorer.py
+++ b/doc/code/scoring/5_human_in_the_loop_scorer.py
@@ -10,6 +10,9 @@
 # ---
 
 # %% [markdown]
+# > ⚠️ **Deprecated:** The `HumanInTheLoopScorerGradio` is deprecated and will be removed in PyRIT v0.13.0.
+# > Use the React-based GUI (CoPyRIT) instead. See the [GUI documentation](../gui/0_gui.md) for details.
+#
 # # 5. Human in the Loop Scoring with Gradio
 # This example shows how to use the Gradio UI to perform human-in-the-loop scoring. This is in beta but will be extended.
 
diff --git a/pyrit/prompt_converter/human_in_the_loop_converter.py b/pyrit/prompt_converter/human_in_the_loop_converter.py
index ad2f4edb6..7b98fa093 100644
--- a/pyrit/prompt_converter/human_in_the_loop_converter.py
+++ b/pyrit/prompt_converter/human_in_the_loop_converter.py
@@ -4,6 +4,7 @@
 import logging
 from typing import Optional
 
+from pyrit.common.deprecation import print_deprecation_message
 from pyrit.identifiers import ComponentIdentifier
 from pyrit.models import PromptDataType
 from pyrit.prompt_converter.prompt_converter import ConverterResult, PromptConverter
@@ -17,6 +18,10 @@ class HumanInTheLoopConverter(PromptConverter):
 
     Users can choose to send the prompt as is, modify the prompt,
     or run the prompt through one of the passed-in converters before sending it.
+
+    .. deprecated::
+        This converter is deprecated and will be removed in v0.13.0.
+        Use the React-based GUI (CoPyRIT) instead.
     """
 
     SUPPORTED_INPUT_TYPES = ("text",)
@@ -32,6 +37,12 @@ def __init__(
         Args:
             converters (List[PromptConverter], Optional): List of possible converters to run input through.
         """
+        print_deprecation_message(
+            old_item="HumanInTheLoopConverter",
+            new_item="the React-based GUI (CoPyRIT); see https://azure.github.io/PyRIT/code/gui/0_gui.html",
+            removed_in="0.13.0",
+        )
+
         self._converters = converters or []
 
     def _build_identifier(self) -> ComponentIdentifier:
diff --git a/pyrit/score/human/human_in_the_loop_gradio.py b/pyrit/score/human/human_in_the_loop_gradio.py
index a4a504a50..9f01ec482 100644
--- a/pyrit/score/human/human_in_the_loop_gradio.py
+++ b/pyrit/score/human/human_in_the_loop_gradio.py
@@ -4,6 +4,7 @@
 import asyncio
 from typing import Optional
 
+from pyrit.common.deprecation import print_deprecation_message
 from pyrit.identifiers import ComponentIdentifier
 from pyrit.models import MessagePiece, Score
 from pyrit.score.scorer_prompt_validator import ScorerPromptValidator
@@ -19,6 +20,10 @@ class HumanInTheLoopScorerGradio(TrueFalseScorer):
     Create scores from manual human input using Gradio and adds them to the database.
 
     In the future this will not be a TrueFalseScorer. However, it is all that is supported currently.
+
+    .. deprecated::
+        This Gradio-based scorer is deprecated and will be removed in v0.13.0.
+        Use the React-based GUI instead.
     """
 
     _DEFAULT_VALIDATOR: ScorerPromptValidator = ScorerPromptValidator(supported_data_types=["text"])
@@ -40,6 +45,12 @@ def __init__(
             score_aggregator (TrueFalseAggregatorFunc): Aggregator for combining scores. Defaults to
                 TrueFalseScoreAggregator.OR.
         """
+        print_deprecation_message(
+            old_item="HumanInTheLoopScorerGradio (Gradio-based GUI)",
+            new_item="the React-based GUI (CoPyRIT); see https://azure.github.io/PyRIT/code/gui/0_gui.html",
+            removed_in="0.13.0",
+        )
+
         # Import here to avoid importing rpyc in the main module that might not be installed
         from pyrit.ui.rpc import AppRPCServer
 
diff --git a/pyrit/ui/__init__.py b/pyrit/ui/__init__.py
index b14b47650..931d2b6a8 100644
--- a/pyrit/ui/__init__.py
+++ b/pyrit/ui/__init__.py
@@ -1,2 +1,10 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT license.
+
+from pyrit.common.deprecation import print_deprecation_message
+
+print_deprecation_message(
+    old_item="pyrit.ui module (Gradio-based GUI)",
+    new_item="the React-based GUI (CoPyRIT); see https://azure.github.io/PyRIT/code/gui/0_gui.html",
+    removed_in="0.13.0",
+)
diff --git a/tests/unit/docs/test_converter_documentation.py b/tests/unit/docs/test_converter_documentation.py
index 9a4d1e25c..8ce34657d 100644
--- a/tests/unit/docs/test_converter_documentation.py
+++ b/tests/unit/docs/test_converter_documentation.py
@@ -32,7 +32,7 @@ def get_converters_mentioned_in_notebooks():
         if notebook_file.name.startswith("_"):
             continue
 
-        content = notebook_file.read_text()
+        content = notebook_file.read_text(encoding="utf-8")
 
         # Look for converter imports and class names
         # Pattern 1: from pyrit.prompt_converter import ConverterName