diff --git a/src/ui/MentionUserLabel/__tests__/__snapshots__/MentionUserLabel.spec.js.snap b/src/ui/MentionUserLabel/__tests__/__snapshots__/MentionUserLabel.spec.js.snap
index 41c7db5ee..c14293da5 100644
--- a/src/ui/MentionUserLabel/__tests__/__snapshots__/MentionUserLabel.spec.js.snap
+++ b/src/ui/MentionUserLabel/__tests__/__snapshots__/MentionUserLabel.spec.js.snap
@@ -5,6 +5,7 @@ exports[`ui/MentionUserLabel should do a snapshot test of the MentionUserLabel D
   <span
     class="sendbird-mention-user-label   undefined"
     contenteditable="false"
+    data-sb-mention="true"
   />
 </DocumentFragment>
 `;
diff --git a/src/ui/MentionUserLabel/__tests__/renderToString.spec.js b/src/ui/MentionUserLabel/__tests__/renderToString.spec.js
new file mode 100644
index 000000000..d7c76ebb2
--- /dev/null
+++ b/src/ui/MentionUserLabel/__tests__/renderToString.spec.js
@@ -0,0 +1,11 @@
+import renderToString from "../renderToString";
+
+describe("ui/MentionUserLabel/renderToString", () => {
+  it("should render userId and nickname as expected", () => {
+    const userId = "me";
+    const nickname = "nickname";
+    const expected = `<span contenteditable="false" class="sendbird-mention-user-label" data-sb-mention="true" data-userid="me">nickname</span>`;
+    const result = renderToString({ userId, nickname });
+    expect(result).toEqual(expected);
+  });
+});
diff --git a/src/ui/MentionUserLabel/consts.ts b/src/ui/MentionUserLabel/consts.ts
new file mode 100644
index 000000000..c3e2ab763
--- /dev/null
+++ b/src/ui/MentionUserLabel/consts.ts
@@ -0,0 +1 @@
+export const MENTION_USER_LABEL_CLASSNAME = 'sendbird-mention-user-label';
diff --git a/src/ui/MentionUserLabel/index.tsx b/src/ui/MentionUserLabel/index.tsx
index 3ed14cec2..50e03d236 100644
--- a/src/ui/MentionUserLabel/index.tsx
+++ b/src/ui/MentionUserLabel/index.tsx
@@ -1,6 +1,8 @@
-import React from 'react';
 import './index.scss';
 
+import React from 'react';
+import { MENTION_USER_LABEL_CLASSNAME } from './consts';
+
 interface MentionUserLabelProps {
   className?: string
   children?: string;
@@ -18,9 +20,10 @@ export default function MentionUserLabel({
 }: MentionUserLabelProps): JSX.Element {
   return (
     <span
-      className={`sendbird-mention-user-label ${className} ${isReverse ? 'reverse' : ''} ${color}`}
+      className={`${MENTION_USER_LABEL_CLASSNAME} ${className} ${isReverse ? 'reverse' : ''} ${color}`}
       contentEditable={false}
       data-userid={userId}
+      data-sb-mention={true}
     >
       {children}
     </span>
diff --git a/src/ui/MentionUserLabel/renderToString.ts b/src/ui/MentionUserLabel/renderToString.ts
new file mode 100644
index 000000000..ebfd129ae
--- /dev/null
+++ b/src/ui/MentionUserLabel/renderToString.ts
@@ -0,0 +1,20 @@
+// cretes a sanitized string from a mention user label
+import DOMPurify from 'dompurify';
+import { MENTION_USER_LABEL_CLASSNAME } from './consts';
+
+type renderToStringParams = {
+  userId: string;
+  nickname: string;
+};
+
+export default function renderToString({ userId, nickname }: renderToStringParams): string {
+  // donot change this template, it wont work
+  const el = `<span data-userid="${userId}" data-sb-mention="true" class="${MENTION_USER_LABEL_CLASSNAME}">${nickname}</span>`;
+  const purifier = DOMPurify(window);
+  const sanitized_ = purifier.sanitize(el);
+  const token = sanitized_.split(' ');
+  const [spanTag, ...rest] = token;
+  // we do this because DOMPurify removes the contenteditable attribute
+  const sanitized = [spanTag, 'contenteditable="false"', ...rest].join(' ');
+  return sanitized;
+}
diff --git a/src/ui/MessageInput/hooks/usePaste/insertTemplate.tsx b/src/ui/MessageInput/hooks/usePaste/insertTemplate.ts
similarity index 58%
rename from src/ui/MessageInput/hooks/usePaste/insertTemplate.tsx
rename to src/ui/MessageInput/hooks/usePaste/insertTemplate.ts
index 9d14decc8..74c0b4782 100644
--- a/src/ui/MessageInput/hooks/usePaste/insertTemplate.tsx
+++ b/src/ui/MessageInput/hooks/usePaste/insertTemplate.ts
@@ -1,23 +1,12 @@
-import React from 'react';
-import { renderToString } from 'react-dom/server';
-
 import { Word } from './types';
 import { sanitizeString } from '../../utils';
-import MentionUserLabel from '../../../MentionUserLabel';
+import renderMentionLabelToString from '../../../MentionUserLabel/renderToString';
 
 export function inserTemplateToDOM(templateList: Word[]): void {
   const nodes = templateList.map((template) => {
     const { text, userId } = template;
     if (userId) {
-      return (
-        renderToString(
-          <>
-            <MentionUserLabel userId={userId}>
-              {text}
-            </MentionUserLabel>
-          </>
-        )
-      );
+      return renderMentionLabelToString({ userId, nickname: text });
     }
     return sanitizeString(text);
   })
diff --git a/src/ui/MessageInput/index.jsx b/src/ui/MessageInput/index.jsx
index 64ef25a88..c6af70938 100644
--- a/src/ui/MessageInput/index.jsx
+++ b/src/ui/MessageInput/index.jsx
@@ -6,7 +6,6 @@ import React, {
   useCallback,
   useContext,
 } from 'react';
-import { renderToString } from 'react-dom/server';
 import PropTypes from 'prop-types';
 
 import './index.scss';
@@ -15,7 +14,7 @@ import { MessageInputKeys, NodeNames, NodeTypes } from './const';
 import { USER_MENTION_TEMP_CHAR } from '../../smart-components/Channel/context/const';
 import IconButton from '../IconButton';
 import Button, { ButtonTypes, ButtonSizes } from '../Button';
-import MentionUserLabel from '../MentionUserLabel';
+import renderMentionLabelToString from '../MentionUserLabel/renderToString';
 import Icon, { IconTypes, IconColors } from '../Icon';
 import Label, { LabelTypography, LabelColors } from '../Label';
 import { LocalizationContext } from '../../lib/LocalizationContext';
@@ -161,16 +160,11 @@ const MessageInput = React.forwardRef((props, ref) => {
           convertWordToStringObj(word, mentionedUsers).map((stringObj) => {
             const { type, value, userId } = stringObj;
             if (type === StringObjType.mention && mentionedUsers.some((user) => user?.userId === userId)) {
-              return renderToString(
-                <MentionUserLabel userId={userId}>
-                  {
-                    `${USER_MENTION_TEMP_CHAR}${mentionedUsers.find((user) => user?.userId === userId)?.nickname
-                    || value
-                    || stringSet.MENTION_NAME__NO_NAME
-                    }`
-                  }
-                </MentionUserLabel>,
-              );
+              const nickname = `${USER_MENTION_TEMP_CHAR}${mentionedUsers.find((user) => user?.userId === userId)?.nickname
+                || value
+                || stringSet.MENTION_NAME__NO_NAME
+              }`
+              return renderMentionLabelToString({ userId, nickname });
             }
             return sanitizeString(value);
           }).join('')
@@ -220,11 +214,10 @@ const MessageInput = React.forwardRef((props, ref) => {
         const backTextNode = document?.createTextNode(
           `\u00A0${childNodes[endNodeIndex]?.textContent.slice(endOffsetIndex)}`,
         );
-        const mentionLabel = renderToString(
-          <MentionUserLabel userId={mentionSelectedUser?.userId}>
-            {`${USER_MENTION_TEMP_CHAR}${mentionSelectedUser?.nickname || stringSet.MENTION_NAME__NO_NAME}`}
-          </MentionUserLabel>,
-        );
+        const mentionLabel = renderMentionLabelToString({
+          userId: mentionSelectedUser?.userId,
+          nickname: `${USER_MENTION_TEMP_CHAR}${mentionSelectedUser?.nickname || stringSet.MENTION_NAME__NO_NAME}`,
+        });
         const div = document.createElement('div');
         div.innerHTML = mentionLabel;
         const newNodes = [