diff --git a/desktop/src/components/layout/AppShell.tsx b/desktop/src/components/layout/AppShell.tsx
index c9e578ab..af09547b 100644
--- a/desktop/src/components/layout/AppShell.tsx
+++ b/desktop/src/components/layout/AppShell.tsx
@@ -28,6 +28,7 @@ function isChatTab(tab: Tab | undefined) {
 
 export function AppShell() {
   const fetchSettings = useSettingsStore((s) => s.fetchAll)
+  const uiZoom = useSettingsStore((s) => s.uiZoom)
   const sidebarOpen = useUIStore((s) => s.sidebarOpen)
   const toggleSidebar = useUIStore((s) => s.toggleSidebar)
   const setSidebarOpen = useUIStore((s) => s.setSidebarOpen)
@@ -194,7 +195,7 @@ export function AppShell() {
   }
 
   return (
-    <div className={`app-shell app-shell-viewport flex overflow-hidden bg-[var(--color-surface)]${isMobileShell ? ' app-shell--mobile' : ''}`}>
+    <div className={`app-shell app-shell-viewport flex overflow-hidden bg-[var(--color-surface)]${isMobileShell ? ' app-shell--mobile' : ''}`} style={{ zoom: uiZoom }}>
       {isMobileShell && effectiveSidebarOpen ? (
         <button
           type="button"
diff --git a/desktop/src/components/layout/Sidebar.tsx b/desktop/src/components/layout/Sidebar.tsx
index 3fdf4575..15f98976 100644
--- a/desktop/src/components/layout/Sidebar.tsx
+++ b/desktop/src/components/layout/Sidebar.tsx
@@ -583,7 +583,7 @@ export function Sidebar({ isMobile = false, onRequestClose }: SidebarProps) {
       )}
 
       {!isMobile && (
-        <div className={`border-t border-[var(--color-border)] p-3 ${expanded ? '' : 'flex justify-center'}`}>
+        <div className={`absolute bottom-0 left-0 right-0 border-t border-[var(--color-border)] p-3 ${expanded ? '' : 'flex justify-center'}`}>
           <NavItem
             active={activeTabId === SETTINGS_TAB_ID}
             collapsed={!expanded}
diff --git a/desktop/src/i18n/locales/en.ts b/desktop/src/i18n/locales/en.ts
index 78678beb..c9799697 100644
--- a/desktop/src/i18n/locales/en.ts
+++ b/desktop/src/i18n/locales/en.ts
@@ -786,6 +786,8 @@ export const en = {
   'settings.general.webSearchBraveFreeHint': 'Create an account to generate a Search API key with free usage for testing.',
   'settings.general.webSearchHint': 'Auto uses native Claude web search for Claude model names, then falls back to Tavily and Brave keys.',
   'settings.general.webSearchSave': 'Save',
+  'settings.general.uiZoom': 'UI Zoom',
+  'settings.general.uiZoomDescription': 'Scale the entire interface for better visibility on high-DPI displays.',
 
   // ─── Empty Session ──────────────────────────────────────
   'empty.title': 'New session',
diff --git a/desktop/src/i18n/locales/zh.ts b/desktop/src/i18n/locales/zh.ts
index e4a7b18a..81b0d7f7 100644
--- a/desktop/src/i18n/locales/zh.ts
+++ b/desktop/src/i18n/locales/zh.ts
@@ -789,6 +789,8 @@ export const zh: Record<TranslationKey, string> = {
   'settings.general.webSearchBraveFreeHint': '注册账号后可创建 Search API Key，免费额度可用于测试。',
   'settings.general.webSearchHint': '自动模式会对 Claude 模型名优先使用原生 WebSearch，失败或非 Claude 模型时再使用 Tavily/Brave。',
   'settings.general.webSearchSave': '保存',
+  'settings.general.uiZoom': '界面缩放',
+  'settings.general.uiZoomDescription': '缩放整个界面，以便在高 DPI 屏幕上获得更好的可见性。',
 
   // ─── Empty Session ──────────────────────────────────────
   'empty.title': '新建会话',
diff --git a/desktop/src/pages/Settings.tsx b/desktop/src/pages/Settings.tsx
index 404f7a82..8f3f3d93 100644
--- a/desktop/src/pages/Settings.tsx
+++ b/desktop/src/pages/Settings.tsx
@@ -1,7 +1,7 @@
 import { useState, useEffect, useMemo, useRef, type ReactNode } from 'react'
 import QRCode from 'qrcode'
 import { Copy, Eye, EyeOff, PowerOff, QrCode, RotateCw } from 'lucide-react'
-import { useSettingsStore } from '../stores/settingsStore'
+import { useSettingsStore, UI_ZOOM_MIN, UI_ZOOM_MAX, UI_ZOOM_STEP } from '../stores/settingsStore'
 import { useProviderStore } from '../stores/providerStore'
 import { useTranslation } from '../i18n'
 import { Modal } from '../components/shared/Modal'
@@ -1386,6 +1386,8 @@ function GeneralSettings() {
     appModeRequiresRestart,
     fetchAppMode,
     setAppMode: setAppModeAction,
+    uiZoom,
+    setUiZoom,
   } = useSettingsStore()
   const t = useTranslation()
   const [webSearchDraft, setWebSearchDraft] = useState(webSearch)
@@ -1859,6 +1861,32 @@ function GeneralSettings() {
           </div>
         </div>
       </div>
+      {/* UI Zoom */}
+      <div className="mt-8">
+        <h2 className="text-base font-semibold text-[var(--color-text-primary)] mb-1">{t('settings.general.uiZoom')}</h2>
+        <p className="text-sm text-[var(--color-text-tertiary)] mb-3">{t('settings.general.uiZoomDescription')}</p>
+        <div className="flex flex-col gap-2">
+          <div className="flex items-center justify-end">
+            <span className="text-sm text-[var(--color-text-secondary)]">
+              {Math.round(uiZoom * 100)}%
+            </span>
+          </div>
+          <div className="flex items-center gap-3">
+            <span className="text-xs text-[var(--color-text-tertiary)]">{Math.round(UI_ZOOM_MIN * 100)}%</span>
+            <input
+              type="range"
+              min={UI_ZOOM_MIN}
+              max={UI_ZOOM_MAX}
+              step={UI_ZOOM_STEP}
+              value={uiZoom}
+              onChange={(e) => setUiZoom(parseFloat(e.target.value))}
+              onMouseUp={(e) => e.currentTarget.blur()}
+              className="flex-1"
+            />
+            <span className="text-xs text-[var(--color-text-tertiary)]">{Math.round(UI_ZOOM_MAX * 100)}%</span>
+          </div>
+        </div>
+      </div>
 
       {/* Confirm dialog for mode switch */}
       <ConfirmDialog
diff --git a/desktop/src/stores/settingsStore.ts b/desktop/src/stores/settingsStore.ts
index 0a82e445..7c51fb60 100644
--- a/desktop/src/stores/settingsStore.ts
+++ b/desktop/src/stores/settingsStore.ts
@@ -9,6 +9,10 @@ import type { Locale } from '../i18n'
 import { useUIStore } from './uiStore'
 
 const LOCALE_STORAGE_KEY = 'cc-haha-locale'
+const UI_ZOOM_STORAGE_KEY = 'cc-haha-ui-zoom'
+export const UI_ZOOM_MIN = 0.5
+export const UI_ZOOM_MAX = 2.0
+export const UI_ZOOM_STEP = 0.05
 let desktopNotificationsSaveQueue: Promise<void> = Promise.resolve()
 
 function getStoredLocale(): Locale {
@@ -19,6 +23,17 @@ function getStoredLocale(): Locale {
   return 'zh'
 }
 
+function getStoredUiZoom(): number {
+  try {
+    const stored = localStorage.getItem(UI_ZOOM_STORAGE_KEY)
+    if (stored === null) return 1.0
+    const parsed = parseFloat(stored)
+    if (isNaN(parsed)) return 1.0
+    return Math.min(UI_ZOOM_MAX, Math.max(UI_ZOOM_MIN, parsed))
+  } catch { /* localStorage unavailable */ }
+  return 1.0
+}
+
 type SettingsStore = {
   permissionMode: PermissionMode
   currentModel: ModelInfo | null
@@ -34,6 +49,7 @@ type SettingsStore = {
   h5Access: H5AccessSettings
   h5AccessError: string | null
   responseLanguage: string
+  uiZoom: number
   isLoading: boolean
   error: string | null
 
@@ -61,6 +77,7 @@ type SettingsStore = {
   setResponseLanguage: (language: string) => Promise<void>
   fetchAppMode: () => Promise<void>
   setAppMode: (mode: AppMode, portableDir?: string | null) => Promise<void>
+  setUiZoom: (zoom: number) => void
 }
 
 const DEFAULT_H5_ACCESS_SETTINGS: H5AccessSettings = {
@@ -85,11 +102,17 @@ export const useSettingsStore = create<SettingsStore>((set, get) => ({
   h5Access: DEFAULT_H5_ACCESS_SETTINGS,
   h5AccessError: null,
   responseLanguage: '',
+  uiZoom: getStoredUiZoom(),
   isLoading: false,
   error: null,
 
   appMode: { mode: 'default', portableDir: null, defaultPortableDir: null },
   appModeRequiresRestart: false,
+  setUiZoom: (zoom: number) => {
+    const clamped = Math.min(UI_ZOOM_MAX, Math.max(UI_ZOOM_MIN, zoom))
+    set({ uiZoom: clamped })
+    try { localStorage.setItem(UI_ZOOM_STORAGE_KEY, String(clamped)) } catch { /* noop */ }
+  },
 
   fetchAll: async () => {
     set({ isLoading: true, error: null })
diff --git a/desktop/src/types/settings.ts b/desktop/src/types/settings.ts
index 0aaf62f5..101de007 100644
--- a/desktop/src/types/settings.ts
+++ b/desktop/src/types/settings.ts
@@ -43,6 +43,7 @@ export type UserSettings = {
   desktopNotificationsEnabled?: boolean
   webSearch?: WebSearchSettings
   language?: string
+  uiZoom?: number
   [key: string]: unknown
 }