diff --git a/examples/webpage/app.js b/examples/webpage/app.js
index 2648e69..24337ec 100644
--- a/examples/webpage/app.js
+++ b/examples/webpage/app.js
@@ -45,6 +45,7 @@ function defaultWsUrl() {
 const els = {
   url: document.getElementById("ws-url"),
   chatId: document.getElementById("chat-id"),
+  copyChatIdBtn: document.getElementById("copy-chat-id-btn"),
   connectBtn: document.getElementById("connect-btn"),
   statusDot: document.getElementById("status-dot"),
   statusText: document.getElementById("status-text"),
@@ -70,9 +71,21 @@ const els = {
   sendBtn: document.getElementById("send-btn"),
 };
 
-function wsUrlWithChatId() {
+function generateChatId() {
+  if (typeof crypto !== "undefined" && crypto.randomUUID) {
+    return `voice_${crypto.randomUUID().replaceAll("-", "").slice(0, 16)}`;
+  }
+  return `voice_${Date.now().toString(36)}${Math.random()
+    .toString(36)
+    .slice(2, 10)}`;
+}
+
+function currentChatIdInput() {
+  return (els.chatId.value || "").trim();
+}
+
+function wsUrlWithChatId(chatId) {
   const rawUrl = (els.url.value || "").trim();
-  const chatId = (els.chatId.value || "").trim();
   if (!rawUrl || !chatId) return rawUrl;
 
   try {
@@ -89,6 +102,7 @@ const state = {
   ws: null,
   connected: false,
   connecting: false,
+  chatId: "",
 
   audioContext: null,
   micStream: null,
@@ -127,6 +141,7 @@ function setStatus(kind, text) {
 
 function setConnectButton() {
   els.chatId.disabled = state.connected || state.connecting;
+  els.copyChatIdBtn.disabled = !state.connected || !state.chatId;
   if (state.connecting) {
     els.connectBtn.textContent = "Connecting…";
     els.connectBtn.disabled = true;
@@ -142,6 +157,26 @@ function setConnectButton() {
   }
 }
 
+async function copyChatId() {
+  if (!state.connected || !state.chatId) return;
+  try {
+    await navigator.clipboard.writeText(state.chatId);
+  } catch (_) {
+    const selectionStart = els.chatId.selectionStart;
+    const selectionEnd = els.chatId.selectionEnd;
+    els.chatId.disabled = false;
+    els.chatId.select();
+    document.execCommand("copy");
+    els.chatId.setSelectionRange(selectionStart, selectionEnd);
+    els.chatId.disabled = true;
+  }
+
+  els.copyChatIdBtn.textContent = "Copied";
+  window.setTimeout(() => {
+    els.copyChatIdBtn.textContent = "Copy";
+  }, 1200);
+}
+
 function setMicButton() {
   els.micBtn.disabled = !state.connected;
   els.micBtn.setAttribute("aria-pressed", state.micEnabled ? "true" : "false");
@@ -891,13 +926,17 @@ function handleEvent(event) {
 
 async function connect() {
   if (state.connected || state.connecting) return;
-  const url = wsUrlWithChatId();
+  const inputChatId = currentChatIdInput();
+  const chatId = inputChatId || generateChatId();
+  const url = wsUrlWithChatId(chatId);
   if (!url) {
     setStatus("error", "Missing URL");
     return;
   }
 
   state.connecting = true;
+  state.chatId = chatId;
+  els.chatId.value = chatId;
   setStatus("connecting", "Connecting…");
   setConnectButton();
   addWsLog("system", `connecting ${url}`);
@@ -908,6 +947,8 @@ async function connect() {
   } catch (err) {
     console.error("AudioContext failed", err);
     state.connecting = false;
+    state.chatId = "";
+    if (!inputChatId) els.chatId.value = "";
     setStatus("error", "Audio init failed");
     setConnectButton();
     addWsLog("error", `audio init failed: ${err.message || err}`, "error");
@@ -920,6 +961,8 @@ async function connect() {
   } catch (err) {
     console.error("WebSocket constructor failed", err);
     state.connecting = false;
+    state.chatId = "";
+    if (!inputChatId) els.chatId.value = "";
     setStatus("error", "Bad URL");
     setConnectButton();
     addWsLog("error", `bad websocket URL: ${err.message || err}`, "error");
@@ -929,7 +972,6 @@ async function connect() {
   state.ws = ws;
 
   ws.addEventListener("open", () => {
-    const chatId = (els.chatId.value || "").trim();
     const startMessage = {
       type: "session.start",
       protocol: PROTOCOL,
@@ -939,9 +981,7 @@ async function connect() {
         channels: CHANNELS,
       },
     };
-    if (chatId) {
-      startMessage.chatId = chatId;
-    }
+    startMessage.chatId = state.chatId;
 
     state.connecting = false;
     state.connected = true;
@@ -995,6 +1035,7 @@ async function connect() {
     state.ws = null;
     state.connected = false;
     state.connecting = false;
+    state.chatId = "";
     setAssistantState("");
     if (state.micEnabled) stopMic();
     stopPlaybackQueue();
@@ -1047,6 +1088,8 @@ els.connectBtn.addEventListener("click", () => {
   else connect();
 });
 
+els.copyChatIdBtn.addEventListener("click", copyChatId);
+
 els.micBtn.addEventListener("click", async () => {
   if (!state.connected) return;
   els.micBtn.disabled = true;
diff --git a/examples/webpage/index.html b/examples/webpage/index.html
index deb87f9..5364977 100644
--- a/examples/webpage/index.html
+++ b/examples/webpage/index.html
@@ -27,13 +27,25 @@
           </label>
           <label class="connection__field connection__field--chat">
             <span>Chat ID</span>
-            <input
-              id="chat-id"
-              type="text"
-              placeholder="optional chatId"
-              spellcheck="false"
-              autocomplete="off"
-            />
+            <div class="chat-id-control">
+              <input
+                id="chat-id"
+                type="text"
+                placeholder="optional chatId"
+                spellcheck="false"
+                autocomplete="off"
+              />
+              <button
+                id="copy-chat-id-btn"
+                class="chat-id-control__copy"
+                type="button"
+                disabled
+                title="Copy Chat ID"
+                aria-label="Copy Chat ID"
+              >
+                Copy
+              </button>
+            </div>
           </label>
           <button id="connect-btn" class="btn btn--primary" type="button">
             Connect
diff --git a/examples/webpage/styles.css b/examples/webpage/styles.css
index b50e872..b0312e6 100644
--- a/examples/webpage/styles.css
+++ b/examples/webpage/styles.css
@@ -328,11 +328,50 @@ body {
   min-width: 0;
 }
 
+.connection__field input:disabled {
+  color: var(--text-dim);
+  background: rgba(148, 163, 184, 0.12);
+  cursor: not-allowed;
+}
+
 .connection__field input:focus {
   border-color: var(--accent);
   box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.18);
 }
 
+.chat-id-control {
+  display: flex;
+  min-width: 0;
+}
+
+.chat-id-control input {
+  border-top-right-radius: 0;
+  border-bottom-right-radius: 0;
+}
+
+.chat-id-control__copy {
+  flex: 0 0 auto;
+  border: 1px solid var(--border);
+  border-left: 0;
+  border-radius: 0 10px 10px 0;
+  background: var(--bg-soft);
+  color: var(--text-dim);
+  padding: 0 10px;
+  font: inherit;
+  font-size: 12px;
+  cursor: pointer;
+}
+
+.chat-id-control__copy:disabled {
+  opacity: 0.55;
+  cursor: not-allowed;
+}
+
+.chat-id-control__copy:not(:disabled):hover {
+  color: var(--text);
+  border-color: var(--accent);
+}
+
 .status {
   display: flex;
   align-items: center;