diff --git a/src/llama_stack_client/lib/inference/utils.py b/src/llama_stack_client/lib/inference/utils.py
new file mode 100644
index 00000000..24ed7cd1
--- /dev/null
+++ b/src/llama_stack_client/lib/inference/utils.py
@@ -0,0 +1,21 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+import pathlib
+import base64
+
+
+class MessageAttachment:
+    # https://developer.mozilla.org/en-US/docs/Glossary/Base64
+    @classmethod
+    def base64(cls, file_path: str) -> str:
+        path = pathlib.Path(file_path)
+        return base64.b64encode(path.read_bytes()).decode("utf-8")
+
+    # https://developer.mozilla.org/en-US/docs/Web/URI/Schemes/data
+    @classmethod
+    def data_url(cls, media_type: str, file_path: str) -> str:
+        return f"data:{media_type};base64,{cls.base64(file_path)}"