diff --git a/frontend/components/ClipboardApp.tsx b/frontend/components/ClipboardApp.tsx
index f5a9b8d..a6ae5bf 100644
--- a/frontend/components/ClipboardApp.tsx
+++ b/frontend/components/ClipboardApp.tsx
@@ -202,6 +202,7 @@ const ClipboardApp = () => {
               shareMessage={shareMessage}
               currentValidatedShareRoomId={shareRoomId}
               handleLeaveSenderRoom={handleLeaveSenderRoom}
+              putMessageInMs={putMessageInMs}
             />
           ) : (
             <RetrieveTabPanel
diff --git a/frontend/components/ClipboardApp/RetrieveTabPanel.tsx b/frontend/components/ClipboardApp/RetrieveTabPanel.tsx
index 0428b6c..38c40dd 100644
--- a/frontend/components/ClipboardApp/RetrieveTabPanel.tsx
+++ b/frontend/components/ClipboardApp/RetrieveTabPanel.tsx
@@ -1,15 +1,17 @@
-import React, { useCallback } from "react";
+import React, { useCallback, useEffect, useState } from "react";
 import { Input } from "@/components/ui/input";
 import { Button } from "@/components/ui/button";
 import {
   ReadClipboardButton,
   WriteClipboardButton,
 } from "@/components/common/clipboard_btn";
+import Tooltip from "@/components/Tooltip";
 import FileListDisplay from "@/components/ClipboardApp/FileListDisplay";
 import type { Messages } from "@/types/messages";
 import type { FileMeta } from "@/types/webrtc";
 
 import { useFileTransferStore } from "@/stores/fileTransferStore";
+import { getCachedId, setCachedId } from "@/lib/roomIdCache";
 
 interface RetrieveTabPanelProps {
   messages: Messages;
@@ -60,6 +62,12 @@ export function RetrieveTabPanel({
     isReceiverInRoom,
   } = useFileTransferStore();
 
+  // Cached ID state
+  const [hasCachedId, setHasCachedId] = useState<boolean>(false);
+  useEffect(() => {
+    setHasCachedId(!!getCachedId());
+  }, []);
+
   const onLocationPick = useCallback(async (): Promise<boolean> => {
     if (!messages) return false; // Should not happen if panel is rendered
     if (!window.showDirectoryPicker) {
@@ -111,6 +119,46 @@ export function RetrieveTabPanel({
               title={messages.text.ClipboardApp.html.readClipboard_dis}
               onRead={setRetrieveRoomIdInput}
             />
+            {/* Save/Use Cached ID Button placed after Paste button */}
+            <Tooltip
+              content={
+                hasCachedId
+                  ? messages.text.ClipboardApp.html.useCachedId_tips
+                  : messages.text.ClipboardApp.html.saveId_tips
+              }
+            >
+              <span className="inline-block">
+                <Button
+                  className="w-full sm:w-auto px-4"
+                  variant="outline"
+                  onClick={() => {
+                    if (hasCachedId) {
+                      const cached = getCachedId();
+                      if (cached) {
+                        setRetrieveRoomIdInput(cached);
+                      }
+                    } else {
+                      const trimmed = retrieveRoomIdInput.trim();
+                      if (trimmed.length >= 8) {
+                        setCachedId(trimmed);
+                        setHasCachedId(true);
+                        putMessageInMs(
+                          messages.text.ClipboardApp.saveId_success,
+                          false
+                        );
+                      }
+                    }
+                  }}
+                  disabled={
+                    !hasCachedId && retrieveRoomIdInput.trim().length < 8
+                  }
+                >
+                  {hasCachedId
+                    ? messages.text.ClipboardApp.html.useCachedId_dis
+                    : messages.text.ClipboardApp.html.saveId_dis}
+                </Button>
+              </span>
+            </Tooltip>
             <Input
               aria-label="Retrieve Room ID"
               value={retrieveRoomIdInput}
diff --git a/frontend/components/ClipboardApp/SendTabPanel.tsx b/frontend/components/ClipboardApp/SendTabPanel.tsx
index 6845c88..c00692a 100644
--- a/frontend/components/ClipboardApp/SendTabPanel.tsx
+++ b/frontend/components/ClipboardApp/SendTabPanel.tsx
@@ -2,6 +2,7 @@ import React, { useState, useEffect, useCallback } from "react";
 import dynamic from "next/dynamic";
 import { Input } from "@/components/ui/input";
 import { Button } from "@/components/ui/button";
+import Tooltip from "@/components/Tooltip";
 import {
   ReadClipboardButton,
   WriteClipboardButton,
@@ -13,6 +14,7 @@ import type { Messages } from "@/types/messages";
 import type { CustomFile, FileMeta } from "@/types/webrtc";
 
 import { useFileTransferStore } from "@/stores/fileTransferStore";
+import { getCachedId, setCachedId } from "@/lib/roomIdCache";
 
 // Dynamically import the RichTextEditor
 const RichTextEditor = dynamic(
@@ -39,6 +41,11 @@ interface SendTabPanelProps {
   shareMessage: string;
   currentValidatedShareRoomId: string;
   handleLeaveSenderRoom: () => void; // New prop for leaving room
+  putMessageInMs: (
+    message: string,
+    isShareEnd?: boolean,
+    displayTimeMs?: number
+  ) => void;
 }
 
 export function SendTabPanel({
@@ -53,6 +60,7 @@ export function SendTabPanel({
   shareMessage,
   currentValidatedShareRoomId,
   handleLeaveSenderRoom,
+  putMessageInMs,
 }: SendTabPanelProps) {
   // Get the status from the store
   const {
@@ -69,12 +77,18 @@ export function SendTabPanel({
   );
   // State to track ID generation mode (false = will show simple next, true = will show random next)
   const [isSimpleIdMode, setIsSimpleIdMode] = useState<boolean>(true);
+  // Cached ID state
+  const [hasCachedId, setHasCachedId] = useState<boolean>(false);
 
   // When the validatedShareRoomId from the parent component changes (e.g., after initial fetch), synchronize the local input field's value
   useEffect(() => {
     setInputFieldValue(currentValidatedShareRoomId);
   }, [currentValidatedShareRoomId]);
 
+  useEffect(() => {
+    setHasCachedId(!!getCachedId());
+  }, []);
+
   const handleInputChange = useCallback(
     (e: React.ChangeEvent<HTMLInputElement>) => {
       const newValue = e.target.value;
@@ -127,6 +141,31 @@ export function SendTabPanel({
     setIsSimpleIdMode(!isSimpleIdMode);
   }, [isSimpleIdMode, processRoomIdInput, setInputFieldValue]);
 
+  // Save/Use cached ID button handlers
+  const isSaveEnabled = (inputFieldValue || "").trim().length >= 8;
+  const handleSaveOrUseCachedId = useCallback(() => {
+    if (hasCachedId) {
+      const cached = getCachedId();
+      if (cached) {
+        setInputFieldValue(cached);
+      }
+      return;
+    }
+    // Save current input to cache
+    const trimmed = (inputFieldValue || "").trim();
+    if (trimmed.length >= 8) {
+      setCachedId(trimmed);
+      setHasCachedId(true);
+      // Notify via messages on sender side
+      putMessageInMs(messages.text.ClipboardApp.saveId_success, true);
+    }
+  }, [
+    hasCachedId,
+    inputFieldValue,
+    putMessageInMs,
+    messages.text.ClipboardApp.saveId_success,
+  ]);
+
   return (
     <div id="send-panel" role="tabpanel" aria-labelledby="send-tab">
       <div className="mb-3 text-sm text-gray-600">
@@ -183,6 +222,27 @@ export function SendTabPanel({
                 ? messages.text.ClipboardApp.html.generateRandomId_tips
                 : messages.text.ClipboardApp.html.generateSimpleId_tips}
             </Button>
+            {/* Save/Use Cached ID Button in between */}
+            <Tooltip
+              content={
+                hasCachedId
+                  ? messages.text.ClipboardApp.html.useCachedId_tips
+                  : messages.text.ClipboardApp.html.saveId_tips
+              }
+            >
+              <span className="inline-block">
+                <Button
+                  className="w-full sm:w-auto px-4"
+                  variant="outline"
+                  onClick={handleSaveOrUseCachedId}
+                  disabled={!hasCachedId && !isSaveEnabled}
+                >
+                  {hasCachedId
+                    ? messages.text.ClipboardApp.html.useCachedId_dis
+                    : messages.text.ClipboardApp.html.saveId_dis}
+                </Button>
+              </span>
+            </Tooltip>
             <Button
               className="w-full sm:w-auto px-4"
               onClick={() => joinRoom(true, inputFieldValue.trim())}
diff --git a/frontend/constants/messages/de.ts b/frontend/constants/messages/de.ts
index f0ccd27..ba10c8f 100644
--- a/frontend/constants/messages/de.ts
+++ b/frontend/constants/messages/de.ts
@@ -336,7 +336,15 @@ export const de: Messages = {
         readClipboard_dis: "Raum-ID einfügen",
         retrieveRoomId_placeholder: "Raum-ID eingeben",
         RetrieveMethodTitle: "Abrufmethode",
+        // New: cached ID utils
+        saveId_dis: "ID speichern",
+        useCachedId_dis: "Gespeicherte ID verwenden",
+        saveId_tips: "Aktuelle ID für spätere schnelle Nutzung speichern",
+        useCachedId_tips:
+          "Zuvor gespeicherte ID verwenden, um Tippen zu vermeiden",
       },
+      // New: cache messages
+      saveId_success: "Erfolgreich im Cache gespeichert",
     },
     home: {
       h1: "Kostenloses sicheres Online-Clipboard & Dateiübertragungstool",
diff --git a/frontend/constants/messages/en.ts b/frontend/constants/messages/en.ts
index 52c7e29..308c249 100644
--- a/frontend/constants/messages/en.ts
+++ b/frontend/constants/messages/en.ts
@@ -327,7 +327,15 @@ export const en: Messages = {
         readClipboard_dis: "Paste RoomID",
         retrieveRoomId_placeholder: "Enter RoomID",
         RetrieveMethodTitle: "Retrieve method",
+        // New: cached ID utils
+        saveId_dis: "Save ID",
+        useCachedId_dis: "Use cached ID",
+        saveId_tips: "Save current ID for quick reuse later",
+        useCachedId_tips:
+          "Quickly use the previously saved ID to avoid typing",
       },
+      // New: cache messages
+      saveId_success: "Saved to cache",
     },
     home: {
       h1: "Free Secure Online Clipboard & File Transfer Tool",
diff --git a/frontend/constants/messages/es.ts b/frontend/constants/messages/es.ts
index 528adff..99e3fb5 100644
--- a/frontend/constants/messages/es.ts
+++ b/frontend/constants/messages/es.ts
@@ -331,7 +331,15 @@ export const es: Messages = {
         readClipboard_dis: "Pegar ID de Sala",
         retrieveRoomId_placeholder: "Ingresa ID de Sala",
         RetrieveMethodTitle: "Método de recuperación",
+        // New: cached ID utils
+        saveId_dis: "Guardar ID",
+        useCachedId_dis: "Usar ID en caché",
+        saveId_tips: "Guarda el ID actual para reutilizarlo rápidamente",
+        useCachedId_tips:
+          "Usa el ID guardado previamente para evitar escribir",
       },
+      // New: cache messages
+      saveId_success: "Guardado en caché",
     },
     home: {
       h1: "Herramienta Gratuita de Portapapeles y Transferencia de Archivos en Línea Segura",
diff --git a/frontend/constants/messages/fr.ts b/frontend/constants/messages/fr.ts
index 0a2d04e..6aedf39 100644
--- a/frontend/constants/messages/fr.ts
+++ b/frontend/constants/messages/fr.ts
@@ -338,7 +338,16 @@ export const fr: Messages = {
         readClipboard_dis: "Coller l'ID de salle",
         retrieveRoomId_placeholder: "Entrez l'ID de salle",
         RetrieveMethodTitle: "Méthode de récupération",
+        // New: cached ID utils
+        saveId_dis: "Enregistrer l’ID",
+        useCachedId_dis: "Utiliser l’ID en cache",
+        saveId_tips:
+          "Enregistrez l’ID actuel pour une réutilisation rapide",
+        useCachedId_tips:
+          "Utilisez l’ID précédemment enregistré pour éviter la saisie",
       },
+      // New: cache messages
+      saveId_success: "Enregistré dans le cache",
     },
     home: {
       h1: "Outil gratuit de transfert de fichiers et de presse-papiers en ligne sécurisé",
diff --git a/frontend/constants/messages/ja.ts b/frontend/constants/messages/ja.ts
index 01955e0..1a6167a 100644
--- a/frontend/constants/messages/ja.ts
+++ b/frontend/constants/messages/ja.ts
@@ -323,7 +323,14 @@ export const ja: Messages = {
         readClipboard_dis: "ルームIDを貼り付け",
         retrieveRoomId_placeholder: "ルームIDを入力",
         RetrieveMethodTitle: "取得方法",
+        // New: cached ID utils
+        saveId_dis: "ID を保存",
+        useCachedId_dis: "保存済みIDを使用",
+        saveId_tips: "現在のIDを保存して次回すぐに使えるようにします",
+        useCachedId_tips: "以前に保存したIDを使って入力を省略できます",
       },
+      // New: cache messages
+      saveId_success: "キャッシュに保存しました",
     },
     home: {
       h1: "無料で安全なオンラインクリップボード＆ファイル転送ツール",
diff --git a/frontend/constants/messages/ko.ts b/frontend/constants/messages/ko.ts
index 603485a..955a9b2 100644
--- a/frontend/constants/messages/ko.ts
+++ b/frontend/constants/messages/ko.ts
@@ -321,7 +321,16 @@ export const ko: Messages = {
         readClipboard_dis: "방 ID 붙여넣기",
         retrieveRoomId_placeholder: "방 ID 입력",
         RetrieveMethodTitle: "검색 방법",
+        // New: cached ID utils
+        saveId_dis: "ID 저장",
+        useCachedId_dis: "저장된 ID 사용",
+        saveId_tips:
+          "현재 ID를 저장하여 다음에 빠르게 사용할 수 있어요",
+        useCachedId_tips:
+          "이전에 저장한 ID를 사용하여 입력을 줄입니다",
       },
+      // New: cache messages
+      saveId_success: "캐시에 저장되었습니다",
     },
     home: {
       h1: "무료 보안 온라인 클립보드 및 파일 전송 도구",
diff --git a/frontend/constants/messages/zh.ts b/frontend/constants/messages/zh.ts
index f8fd1bf..34c682c 100644
--- a/frontend/constants/messages/zh.ts
+++ b/frontend/constants/messages/zh.ts
@@ -283,7 +283,8 @@ export const zh: Messages = {
       noFilesForFolderMsg: "在文件夹 '{folderName}' 中未找到文件。",
       zipError: "创建 ZIP 文件时出错。",
       fileNotFoundMsg: "未找到要下载的文件 '{fileName}'。",
-      confirmLeaveWhileTransferring: "传输将中断，已设置保存目录时可续传。确定退出？",
+      confirmLeaveWhileTransferring:
+        "传输将中断，已设置保存目录时可续传。确定退出？",
       leaveWhileTransferringSuccess: "已退出房间，传输已中断",
       html: {
         senderTab: "发送",
@@ -296,7 +297,7 @@ export const zh: Messages = {
         inputRoomIdprompt: "您的房间ID（可编辑）：",
         joinRoomBtn: "加入房间",
         generateSimpleId_tips: "简单ID",
-        generateRandomId_tips: "随机ID", 
+        generateRandomId_tips: "随机ID",
         readClipboardToRoomId: "粘贴房间ID",
         enterRoomID_placeholder: "输入房间ID",
         retrieveMethod: "接收方式",
@@ -307,7 +308,14 @@ export const zh: Messages = {
         readClipboard_dis: "粘贴房间ID",
         retrieveRoomId_placeholder: "输入房间ID",
         RetrieveMethodTitle: "接收方式",
+        // New: cached ID utils
+        saveId_dis: "保存ID",
+        useCachedId_dis: "使用缓存ID",
+        saveId_tips: "保存ID后，下次可以快捷使用该ID",
+        useCachedId_tips: "可以快捷使用之前保存的ID,避免手动输入",
       },
+      // New: cache messages
+      saveId_success: "缓存成功",
     },
     home: {
       h1: "免费安全的在线剪贴板与文件传输工具",
diff --git a/frontend/lib/roomIdCache.ts b/frontend/lib/roomIdCache.ts
new file mode 100644
index 0000000..671acc5
--- /dev/null
+++ b/frontend/lib/roomIdCache.ts
@@ -0,0 +1,37 @@
+// Utilities to cache a single room ID in browser localStorage
+// Works on client only; no-ops on server.
+
+const CACHED_KEY = "pd_cached_room_id_v1";
+
+function isClient() {
+  return typeof window !== "undefined";
+}
+
+export function getCachedId(): string | null {
+  if (!isClient()) return null;
+  try {
+    const v = window.localStorage.getItem(CACHED_KEY);
+    return v && v.trim() ? v : null;
+  } catch (_) {
+    return null;
+  }
+}
+
+export function setCachedId(id: string): void {
+  if (!isClient()) return;
+  try {
+    window.localStorage.setItem(CACHED_KEY, id);
+  } catch (_) {
+    // ignore
+  }
+}
+
+export function clearCachedId(): void {
+  if (!isClient()) return;
+  try {
+    window.localStorage.removeItem(CACHED_KEY);
+  } catch (_) {
+    // ignore
+  }
+}
+
diff --git a/frontend/types/messages.ts b/frontend/types/messages.ts
index 02c59f2..3586264 100644
--- a/frontend/types/messages.ts
+++ b/frontend/types/messages.ts
@@ -254,6 +254,11 @@ export type ClipboardAppHtml = {
   readClipboard_dis: string;
   retrieveRoomId_placeholder: string;
   RetrieveMethodTitle: string;
+  // New: cached ID utilities
+  saveId_dis: string;
+  useCachedId_dis: string;
+  saveId_tips: string;
+  useCachedId_tips: string;
 };
 
 export type ClipboardApp = {
@@ -274,6 +279,8 @@ export type ClipboardApp = {
   fileNotFoundMsg?: string;
   confirmLeaveWhileTransferring: string;
   leaveWhileTransferringSuccess: string;
+  // New: cache messages
+  saveId_success: string;
 };
 
 export type Home = {