diff --git a/apps/kimi-web/src/components/ChatPane.vue b/apps/kimi-web/src/components/ChatPane.vue
index 28472b81d..857d3279e 100644
--- a/apps/kimi-web/src/components/ChatPane.vue
+++ b/apps/kimi-web/src/components/ChatPane.vue
@@ -33,6 +33,10 @@ onUnmounted(() => {
     clearTimeout(copiedTimer);
     copiedTimer = null;
   }
+  if (copiedConversationTimer !== null) {
+    clearTimeout(copiedConversationTimer);
+    copiedConversationTimer = null;
+  }
 });
 
 const props = withDefaults(
@@ -99,6 +103,7 @@ const emit = defineEmits<{
   approvalDecide: [approvalId: string, response: { decision: ApprovalDecision; scope?: 'session'; feedback?: string }];
   openFile: [target: FilePreviewRequest];
   openMedia: [media: ToolMedia];
+  copyConversationCopied: [];
   /** Show a thinking block's full text in the right-side panel. */
   openThinking: [target: { turnId: string; blockIndex: number }];
 }>();
@@ -116,7 +121,9 @@ const compactionLabel = computed<string>(() => {
 // Per-turn copy button state (keyed by turn id)
 const copiedTurn = ref<string | null>(null);
 
-
+// Copy-whole-conversation state
+const copiedConversation = ref(false);
+let copiedConversationTimer: ReturnType<typeof setTimeout> | null = null;
 
 /** Assemble the full content of a turn for copying — follows the ordered
     blocks so thinking/text/tool output copy in the order they happened. */
@@ -132,6 +139,47 @@ function turnPlainText(turn: ChatTurn): string {
   return parts.join('\n\n');
 }
 
+/** Convert a single turn to Markdown. */
+function turnToMarkdown(turn: ChatTurn): string {
+  const parts: string[] = [];
+  for (const blk of turnBlocks(turn)) {
+    if (blk.kind === 'thinking' && blk.thinking) {
+      parts.push(`> **Thinking**\n> ${blk.thinking.split('\n').join('\n> ')}`);
+    } else if (blk.kind === 'text' && blk.text) {
+      parts.push(blk.text);
+    } else if (blk.kind === 'tool' && blk.tool.output && blk.tool.output.length > 0) {
+      const output = blk.tool.output.join('\n');
+      parts.push(`\`\`\`\n[${blk.tool.name}]\n${output}\n\`\`\``);
+    }
+  }
+  return parts.join('\n\n');
+}
+
+/** Convert the entire conversation to Markdown and copy to clipboard. */
+function copyConversation(): void {
+  if (props.turns.length === 0) return;
+  const lines: string[] = [];
+  for (const turn of props.turns) {
+    const roleLabel = turn.role === 'user' ? 'User' : 'Assistant';
+    const content = turnToMarkdown(turn);
+    if (content.trim()) {
+      lines.push(`**${roleLabel}**\n\n${content}`);
+    }
+  }
+  const markdown = lines.join('\n\n---\n\n');
+  navigator.clipboard.writeText(markdown).then(() => {
+    copiedConversation.value = true;
+    emit('copyConversationCopied');
+    if (copiedConversationTimer !== null) clearTimeout(copiedConversationTimer);
+    copiedConversationTimer = setTimeout(() => {
+      copiedConversationTimer = null;
+      copiedConversation.value = false;
+    }, 2000);
+  }).catch(() => {/* ignore */});
+}
+
+defineExpose({ copyConversation });
+
 function assistantRunEndingAt(index: number): ChatTurn[] {
   const run: ChatTurn[] = [];
   for (let i = index; i >= 0; i--) {
diff --git a/apps/kimi-web/src/components/ConversationPane.vue b/apps/kimi-web/src/components/ConversationPane.vue
index 9b40b3c34..5507cee88 100644
--- a/apps/kimi-web/src/components/ConversationPane.vue
+++ b/apps/kimi-web/src/components/ConversationPane.vue
@@ -97,6 +97,9 @@ try {
 
 // expose a way for App.vue to imperatively switch to tasks tab
 const active = ref<PaneKey>('chat');
+const chatPaneRef = ref<InstanceType<typeof ChatPane> | null>(null);
+const copyConversationCopied = ref(false);
+let copyConversationCopiedTimer: ReturnType<typeof setTimeout> | null = null;
 
 /** Called by App.vue via command routing to switch to a specific tab */
 function switchTab(tab: PaneKey): void {
@@ -104,6 +107,15 @@ function switchTab(tab: PaneKey): void {
 }
 defineExpose({ switchTab });
 
+function handleCopyConversationCopied(): void {
+  copyConversationCopied.value = true;
+  if (copyConversationCopiedTimer !== null) clearTimeout(copyConversationCopiedTimer);
+  copyConversationCopiedTimer = setTimeout(() => {
+    copyConversationCopiedTimer = null;
+    copyConversationCopied.value = false;
+  }, 2000);
+}
+
 // The TabBar is hidden for an empty session (the centred quick-start composer
 // takes the whole pane) — if the user was parked on tasks/todo/files when the
 // session emptied out, they'd be trapped with no tabs AND no composer. Snap
@@ -527,6 +539,10 @@ onUnmounted(() => {
   if (resizeObserver) resizeObserver.disconnect();
   if (scrollRaf && typeof cancelAnimationFrame === 'function') cancelAnimationFrame(scrollRaf);
   if (abortToastTimer !== null) clearTimeout(abortToastTimer);
+  if (copyConversationCopiedTimer !== null) {
+    clearTimeout(copyConversationCopiedTimer);
+    copyConversationCopiedTimer = null;
+  }
   if (typeof document !== 'undefined') {
     document.removeEventListener('visibilitychange', onVisibilityChange);
     document.removeEventListener('keydown', onKeyDown);
@@ -543,7 +559,10 @@ onUnmounted(() => {
       :changes-count="changesCount"
       :todos="todos ?? []"
       :mobile="mobile"
+      :show-copy-conversation="turns.length > 0"
+      :copy-conversation-copied="copyConversationCopied"
       @select="active = $event"
+      @copy-conversation="chatPaneRef?.copyConversation()"
     />
 
     <!-- Wide-screen floating stack (codex-style): todos + running background
@@ -599,6 +618,7 @@ onUnmounted(() => {
         </template>
         <template v-else>
           <ChatPane
+            ref="chatPaneRef"
             :key="fileReloadKey ?? 'no-session'"
             :turns="turns"
             :approvals="approvals"
@@ -611,6 +631,7 @@ onUnmounted(() => {
             @approval-decide="handleApprovalDecide"
             @open-file="emit('openFile', $event)"
             @open-media="emit('openMedia', $event)"
+            @copy-conversation-copied="handleCopyConversationCopied"
             @open-thinking="emit('openThinking', $event)"
           />
         </template>
diff --git a/apps/kimi-web/src/components/TabBar.vue b/apps/kimi-web/src/components/TabBar.vue
index e6bb5be6b..447021378 100644
--- a/apps/kimi-web/src/components/TabBar.vue
+++ b/apps/kimi-web/src/components/TabBar.vue
@@ -3,8 +3,8 @@
 import { useI18n } from 'vue-i18n';
 import type { PaneKey, TodoView } from '../types';
 
-defineProps<{ active: PaneKey; runningTasks: number; changesCount?: number; todos?: TodoView[]; mobile?: boolean }>();
-const emit = defineEmits<{ select: [pane: PaneKey] }>();
+defineProps<{ active: PaneKey; runningTasks: number; changesCount?: number; todos?: TodoView[]; mobile?: boolean; showCopyConversation?: boolean; copyConversationCopied?: boolean }>();
+const emit = defineEmits<{ select: [pane: PaneKey]; copyConversation: [] }>();
 
 const { t } = useI18n();
 
@@ -19,18 +19,42 @@ const tabs: { key: PaneKey; labelKey: string }[] = [
 
 <template>
   <div class="tabs" :class="{ mobile }">
-    <div
-      v-for="tab in tabs"
-      :key="tab.key"
-      class="tb"
-      :class="{ on: active === tab.key }"
-      @click="emit('select', tab.key)"
-    >
-      {{ t(tab.labelKey) }}
-      <!-- TODO: restore when files tab is re-enabled -->
-      <!-- <span v-if="tab.key === 'files' && (changesCount ?? 0) > 0" class="d"></span> -->
-      <span v-if="tab.key === 'tasks' && runningTasks > 0" class="cnt">{{ runningTasks }}</span>
-      <span v-if="tab.key === 'todo' && (todos?.length ?? 0) > 0" class="cnt">{{ (todos?.filter((t) => t.status === 'done').length ?? 0) }}/{{ todos!.length }}</span>
+    <div class="tabs-left">
+      <div
+        v-for="tab in tabs"
+        :key="tab.key"
+        class="tb"
+        :class="{ on: active === tab.key }"
+        @click="emit('select', tab.key)"
+      >
+        {{ t(tab.labelKey) }}
+        <!-- TODO: restore when files tab is re-enabled -->
+        <!-- <span v-if="tab.key === 'files' && (changesCount ?? 0) > 0" class="d"></span> -->
+        <span v-if="tab.key === 'tasks' && runningTasks > 0" class="cnt">{{ runningTasks }}</span>
+        <span v-if="tab.key === 'todo' && (todos?.length ?? 0) > 0" class="cnt">{{ (todos?.filter((t) => t.status === 'done').length ?? 0) }}/{{ todos!.length }}</span>
+      </div>
+    </div>
+    <div v-if="showCopyConversation && active === 'chat'" class="tabs-right">
+      <button
+        class="share-conversation-btn"
+        :class="{ 'is-copied': copyConversationCopied }"
+        type="button"
+        :aria-label="copyConversationCopied ? t('sidebar.shareConversationCopied') : t('sidebar.shareConversation')"
+        :title="copyConversationCopied ? t('sidebar.shareConversationCopied') : t('sidebar.shareConversation')"
+        @click="emit('copyConversation')"
+      >
+        <svg v-if="!copyConversationCopied" viewBox="0 0 16 16" width="16" height="16" fill="none" stroke="currentColor" stroke-width="1.35" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
+          <path d="M5.5 2.5h6A1.5 1.5 0 0 1 13 4v7.5"/>
+          <rect x="3" y="4.5" width="8" height="9" rx="1.4"/>
+          <path d="M5.3 7.1h3.4"/>
+          <path d="M5.3 9.3h2.8"/>
+          <path d="M5.3 11.5h3.4"/>
+        </svg>
+        <svg v-else viewBox="0 0 16 16" width="16" height="16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
+          <polyline points="3,8 6.5,11.5 13,5"/>
+        </svg>
+        <span class="share-conversation-label">{{ copyConversationCopied ? t('sidebar.shareConversationCopied') : t('sidebar.shareConversation') }}</span>
+      </button>
     </div>
   </div>
 </template>
@@ -40,9 +64,58 @@ const tabs: { key: PaneKey; labelKey: string }[] = [
   height: 32px;
   display: flex;
   align-items: stretch;
+  justify-content: space-between;
   border-bottom: 1px solid var(--line);
   background: var(--panel);
 }
+.tabs-left {
+  display: flex;
+  align-items: stretch;
+}
+.tabs-right {
+  display: flex;
+  align-items: center;
+  padding: 0 12px;
+}
+.share-conversation-btn {
+  display: inline-flex;
+  align-items: center;
+  gap: 5px;
+  padding: 4px;
+  background: transparent;
+  border: none;
+  border-radius: 4px;
+  color: var(--muted);
+  font-size: 12px;
+  font-family: var(--sans);
+  cursor: pointer;
+  transition: color 0.12s, background 0.12s;
+  white-space: nowrap;
+}
+.share-conversation-btn:hover {
+  color: var(--ink);
+  background: var(--panel2);
+}
+.share-conversation-btn.is-copied {
+  color: var(--ok);
+}
+.share-conversation-btn svg {
+  flex: none;
+}
+.share-conversation-label {
+  opacity: 0;
+  max-width: 0;
+  overflow: hidden;
+  transition: opacity 0.15s ease, max-width 0.2s ease;
+}
+.share-conversation-btn:hover .share-conversation-label {
+  opacity: 1;
+  max-width: 120px;
+}
+.share-conversation-btn.is-copied .share-conversation-label {
+  opacity: 1;
+  max-width: 120px;
+}
 .tb {
   padding: 0 14px;
   display: flex;
diff --git a/apps/kimi-web/src/i18n/locales/en/sidebar.ts b/apps/kimi-web/src/i18n/locales/en/sidebar.ts
index 0530e8809..88c4328c7 100644
--- a/apps/kimi-web/src/i18n/locales/en/sidebar.ts
+++ b/apps/kimi-web/src/i18n/locales/en/sidebar.ts
@@ -10,6 +10,8 @@ export default {
   options: 'Options',
   rename: 'Rename',
   copyPath: 'Copy path',
+  shareConversation: 'Copy conversation',
+  shareConversationCopied: 'Copied',
   archive: 'Archive',
   delete: 'Delete',
   brand: 'Kimi Code',
diff --git a/apps/kimi-web/src/i18n/locales/zh/sidebar.ts b/apps/kimi-web/src/i18n/locales/zh/sidebar.ts
index 733b6b441..99c91a619 100644
--- a/apps/kimi-web/src/i18n/locales/zh/sidebar.ts
+++ b/apps/kimi-web/src/i18n/locales/zh/sidebar.ts
@@ -10,6 +10,8 @@ export default {
   options: '选项',
   rename: '重命名',
   copyPath: '复制路径',
+  shareConversation: '复制全部会话',
+  shareConversationCopied: '已复制',
   archive: '归档',
   delete: '删除',
   brand: 'Kimi Code',