diff --git a/client/src/components/AppHeader.vue b/client/src/components/AppHeader.vue
index 964803daf..7516fffac 100644
--- a/client/src/components/AppHeader.vue
+++ b/client/src/components/AppHeader.vue
@@ -1,153 +1,361 @@
 <script setup lang="ts">
-import { ref } from 'vue'
-import { Search, SlidersHorizontal, LayoutGrid, List, X } from 'lucide-vue-next'
+import { computed, nextTick, ref, watch } from 'vue'
+import { ArrowLeft, LayoutGrid, List, Moon, MoreHorizontal, Search, SlidersHorizontal, Sun, X } from 'lucide-vue-next'
+import { useRouter } from 'vue-router'
 import { SidebarTrigger } from '@/components/ui/sidebar'
 import { Separator } from '@/components/ui/separator'
 import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover'
+import { Sheet, SheetContent, SheetHeader, SheetTitle } from '@/components/ui/sheet'
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuLabel,
+  DropdownMenuRadioGroup,
+  DropdownMenuRadioItem,
+  DropdownMenuSeparator,
+  DropdownMenuTrigger,
+} from '@/components/ui/dropdown-menu'
 import { Button } from '@/components/ui/button'
 import AccentPicker from '@/components/AccentPicker.vue'
 import RadiusPicker from '@/components/RadiusPicker.vue'
 import ThemeToggle from '@/components/ThemeToggle.vue'
+import { useThemeStore } from '@/stores/theme'
+import { useGlobalSearch, type GlobalSearchResult } from '@/features/book/composables/useGlobalSearch'
+import BookCoverImage from '@/features/book/components/BookCoverImage.vue'
 
 const props = defineProps<{
   title: string
   total: number
   loaded: number
-  search: string
   coverSize: number
   gridGap: number
   viewMode: 'grid' | 'list'
 }>()
 
 const emit = defineEmits<{
-  'update:search': [value: string]
   'update:coverSize': [value: number]
   'update:gridGap': [value: number]
   'update:viewMode': [value: 'grid' | 'list']
 }>()
 
+const router = useRouter()
+const themeStore = useThemeStore()
+
 const searchFocused = ref(false)
+const mobileSearchOpen = ref(false)
+const mobileDisplayOpen = ref(false)
+const mobileSearchInput = ref<HTMLInputElement | null>(null)
+
+const globalSearchQuery = ref('')
+const { results: globalResults, loading: globalSearchLoading, clear: clearGlobalSearch } = useGlobalSearch(globalSearchQuery)
+
+const showDropdown = computed(
+  () =>
+    (searchFocused.value || mobileSearchOpen.value) &&
+    globalSearchQuery.value.trim().length >= 2 &&
+    (globalResults.value.length > 0 || globalSearchLoading.value),
+)
+
+watch(mobileSearchOpen, (open) => {
+  if (open) nextTick(() => mobileSearchInput.value?.focus())
+})
+
+function clearSearch() {
+  globalSearchQuery.value = ''
+  clearGlobalSearch()
+}
+
+function closeMobileSearch() {
+  mobileSearchOpen.value = false
+  clearSearch()
+}
+
+function navigateToResult(result: GlobalSearchResult) {
+  clearSearch()
+  mobileSearchOpen.value = false
+  router.push({ name: 'library', params: { id: result.libraryId } })
+}
 </script>
 
 <template>
   <header class="flex h-14 shrink-0 items-center gap-2 border-b border-primary/20 bg-background/90 backdrop-blur-md px-3 shadow-sm sticky top-0 z-10">
-    <!-- Left: context -->
-    <SidebarTrigger class="-ml-1 text-muted-foreground hover:text-foreground" />
-
-    <Separator orientation="vertical" class="mx-1 h-4" />
-
-    <div class="flex items-center gap-2">
-      <span class="font-serif font-semibold text-[15px] text-foreground tracking-tight">{{ title }}</span>
-      <span class="text-[11px] font-medium text-primary/70 bg-primary/8 px-2 py-0.5 rounded-full tabular-nums border border-primary/15">
-        {{ loaded.toLocaleString() }}<span class="text-muted-foreground/60 mx-0.5">/</span>{{ total.toLocaleString() }}
-      </span>
-    </div>
-
-    <!-- Right: actions -->
-    <div class="ml-auto flex items-center gap-1">
-      <!-- Search -->
-      <div class="relative flex items-center transition-all duration-200" :class="searchFocused || props.search ? 'w-56' : 'w-44'">
+    <!-- Mobile: search active overlay -->
+    <template v-if="mobileSearchOpen">
+      <Button variant="ghost" size="icon" class="h-8 w-8 shrink-0" @click="closeMobileSearch()">
+        <ArrowLeft :size="16" />
+      </Button>
+      <div class="flex-1 relative flex items-center">
         <Search class="absolute left-2.5 text-muted-foreground pointer-events-none" :size="13" />
         <input
-          :value="props.search"
-          @input="emit('update:search', ($event.target as HTMLInputElement).value)"
-          @focus="searchFocused = true"
-          @blur="searchFocused = false"
-          placeholder="Search books..."
+          ref="mobileSearchInput"
+          v-model="globalSearchQuery"
+          @keydown.esc="clearSearch()"
+          placeholder="Search all books..."
           class="w-full h-8 pl-8 pr-7 text-sm rounded-md border border-input bg-background text-foreground placeholder:text-muted-foreground focus:outline-none focus:ring-2 focus:ring-primary transition-shadow"
         />
-        <button v-if="props.search" @click="emit('update:search', '')" class="absolute right-2 text-muted-foreground hover:text-foreground">
+        <button v-if="globalSearchQuery" @click="clearSearch()" class="absolute right-2 text-muted-foreground hover:text-foreground">
           <X :size="13" />
         </button>
+
+        <!-- Mobile search dropdown -->
+        <div
+          v-if="showDropdown"
+          @mousedown.prevent
+          class="absolute top-full left-0 right-0 mt-1 bg-background border border-border rounded-md shadow-lg z-50 overflow-hidden max-h-72 overflow-y-auto"
+        >
+          <div v-if="globalSearchLoading && globalResults.length === 0" class="p-3 text-xs text-muted-foreground text-center">Searching...</div>
+          <div v-else-if="!globalSearchLoading && globalResults.length === 0" class="p-3 text-xs text-muted-foreground text-center">No results</div>
+          <button
+            v-for="result in globalResults"
+            :key="result.id"
+            @click="navigateToResult(result)"
+            class="w-full flex items-center gap-3 px-3 py-2 hover:bg-accent transition-colors text-left"
+          >
+            <BookCoverImage :book-id="result.id" type="thumbnail" class="h-11 w-8 object-cover rounded shrink-0 bg-muted" :alt="result.title ?? ''" />
+            <div class="flex-1 min-w-0">
+              <p class="text-sm font-medium text-foreground truncate">{{ result.title ?? 'Untitled' }}</p>
+              <p v-if="result.authors.length" class="text-xs text-muted-foreground truncate">{{ result.authors.join(', ') }}</p>
+            </div>
+            <span
+              class="text-[10px] font-medium text-primary/70 bg-primary/8 px-1.5 py-0.5 rounded-full border border-primary/15 shrink-0 max-w-[80px] truncate"
+            >
+              {{ result.libraryName }}
+            </span>
+          </button>
+        </div>
+      </div>
+    </template>
+
+    <!-- Normal state -->
+    <template v-else>
+      <!-- Left: sidebar trigger + library context -->
+      <SidebarTrigger class="-ml-1 text-muted-foreground hover:text-foreground" />
+      <Separator orientation="vertical" class="mx-1 h-4" />
+      <div class="flex items-center gap-2 min-w-0">
+        <span class="font-serif font-semibold text-[15px] text-foreground tracking-tight truncate">
+          {{ title }}
+        </span>
+        <span
+          class="hidden md:inline-flex text-[11px] font-medium text-primary/70 bg-primary/8 px-2 py-0.5 rounded-full tabular-nums border border-primary/15 shrink-0"
+        >
+          {{ loaded.toLocaleString() }}<span class="text-muted-foreground/60 mx-0.5">/</span>{{ total.toLocaleString() }}
+        </span>
       </div>
 
-      <Separator orientation="vertical" class="mx-1 h-4" />
+      <!-- Center: desktop global search -->
+      <div
+        class="hidden md:flex flex-1 mx-4 relative items-center transition-all duration-200"
+        :class="searchFocused || globalSearchQuery ? 'max-w-sm' : 'max-w-xs'"
+      >
+        <Search class="absolute left-2.5 text-muted-foreground pointer-events-none" :size="13" />
+        <input
+          v-model="globalSearchQuery"
+          @focus="searchFocused = true"
+          @blur="searchFocused = false"
+          @keydown.esc="clearSearch()"
+          placeholder="Search all books..."
+          class="w-full h-8 pl-8 pr-7 text-sm rounded-md border border-input bg-background text-foreground placeholder:text-muted-foreground focus:outline-none focus:ring-2 focus:ring-primary transition-shadow"
+        />
+        <button v-if="globalSearchQuery" @click="clearSearch()" class="absolute right-2 text-muted-foreground hover:text-foreground">
+          <X :size="13" />
+        </button>
 
-      <!-- Display settings -->
-      <Popover>
-        <PopoverTrigger as-child>
-          <Button variant="ghost" size="icon" class="h-8 w-8 text-muted-foreground hover:text-foreground">
-            <SlidersHorizontal :size="15" />
+        <!-- Desktop search dropdown -->
+        <div
+          v-if="showDropdown"
+          @mousedown.prevent
+          class="absolute top-full left-0 right-0 mt-1 bg-background border border-border rounded-md shadow-lg z-50 overflow-hidden max-h-72 overflow-y-auto"
+        >
+          <div v-if="globalSearchLoading && globalResults.length === 0" class="p-3 text-xs text-muted-foreground text-center">Searching...</div>
+          <div v-else-if="!globalSearchLoading && globalResults.length === 0" class="p-3 text-xs text-muted-foreground text-center">No results</div>
+          <button
+            v-for="result in globalResults"
+            :key="result.id"
+            @click="navigateToResult(result)"
+            class="w-full flex items-center gap-3 px-3 py-2 hover:bg-accent transition-colors text-left"
+          >
+            <BookCoverImage :book-id="result.id" type="thumbnail" class="h-11 w-8 object-cover rounded shrink-0 bg-muted" :alt="result.title ?? ''" />
+            <div class="flex-1 min-w-0">
+              <p class="text-sm font-medium text-foreground truncate">{{ result.title ?? 'Untitled' }}</p>
+              <p v-if="result.authors.length" class="text-xs text-muted-foreground truncate">{{ result.authors.join(', ') }}</p>
+            </div>
+            <span
+              class="text-[10px] font-medium text-primary/70 bg-primary/8 px-1.5 py-0.5 rounded-full border border-primary/15 shrink-0 max-w-[80px] truncate"
+            >
+              {{ result.libraryName }}
+            </span>
+          </button>
+        </div>
+      </div>
+
+      <!-- Right: actions -->
+      <div class="ml-auto flex items-center gap-1">
+        <!-- Mobile: search icon -->
+        <Button variant="ghost" size="icon" class="md:hidden h-8 w-8 text-muted-foreground hover:text-foreground" @click="mobileSearchOpen = true">
+          <Search :size="15" />
+        </Button>
+
+        <!-- Desktop: view toggle -->
+        <div class="hidden md:flex items-center">
+          <Button
+            variant="ghost"
+            size="icon"
+            class="h-8 w-8"
+            :class="props.viewMode === 'grid' ? 'text-primary' : 'text-muted-foreground hover:text-foreground'"
+            @click="emit('update:viewMode', 'grid')"
+          >
+            <LayoutGrid :size="15" />
           </Button>
-        </PopoverTrigger>
-        <PopoverContent class="w-64 p-4" align="end">
-          <div class="space-y-4">
-            <p class="text-xs font-semibold text-foreground uppercase tracking-wider">Display</p>
+          <Button
+            variant="ghost"
+            size="icon"
+            class="h-8 w-8"
+            :class="props.viewMode === 'list' ? 'text-primary' : 'text-muted-foreground hover:text-foreground'"
+            @click="emit('update:viewMode', 'list')"
+          >
+            <List :size="15" />
+          </Button>
+        </div>
 
-            <!-- Cover size -->
-            <div class="space-y-1.5">
-              <div class="flex items-center justify-between">
-                <span class="text-xs text-muted-foreground">Cover size</span>
-                <span class="text-xs font-medium tabular-nums text-foreground">{{ props.coverSize }}px</span>
+        <Separator orientation="vertical" class="hidden md:block mx-1 h-4" />
+
+        <!-- Desktop: display settings popover -->
+        <Popover>
+          <PopoverTrigger as-child>
+            <Button variant="ghost" size="icon" class="hidden md:flex h-8 w-8 text-muted-foreground hover:text-foreground">
+              <SlidersHorizontal :size="15" />
+            </Button>
+          </PopoverTrigger>
+          <PopoverContent class="w-64 p-4" align="end">
+            <div class="space-y-4">
+              <p class="text-xs font-semibold text-foreground uppercase tracking-wider">Display</p>
+              <div class="space-y-1.5">
+                <div class="flex items-center justify-between">
+                  <span class="text-xs text-muted-foreground">Cover size</span>
+                  <span class="text-xs font-medium tabular-nums text-foreground">{{ props.coverSize }}px</span>
+                </div>
+                <input
+                  :value="props.coverSize"
+                  @input="emit('update:coverSize', Number(($event.target as HTMLInputElement).value))"
+                  type="range"
+                  min="80"
+                  max="280"
+                  step="10"
+                  class="w-full accent-primary cursor-pointer"
+                />
               </div>
-              <input
-                :value="props.coverSize"
-                @input="emit('update:coverSize', Number(($event.target as HTMLInputElement).value))"
-                type="range"
-                min="80"
-                max="280"
-                step="10"
-                class="w-full accent-primary cursor-pointer"
-              />
-            </div>
-
-            <!-- Grid gap -->
-            <div class="space-y-1.5">
-              <div class="flex items-center justify-between">
-                <span class="text-xs text-muted-foreground">Grid gap</span>
-                <span class="text-xs font-medium tabular-nums text-foreground">{{ props.gridGap }}px</span>
+              <div class="space-y-1.5">
+                <div class="flex items-center justify-between">
+                  <span class="text-xs text-muted-foreground">Grid gap</span>
+                  <span class="text-xs font-medium tabular-nums text-foreground">{{ props.gridGap }}px</span>
+                </div>
+                <input
+                  :value="props.gridGap"
+                  @input="emit('update:gridGap', Number(($event.target as HTMLInputElement).value))"
+                  type="range"
+                  min="4"
+                  max="40"
+                  step="4"
+                  class="w-full accent-primary cursor-pointer"
+                />
+              </div>
+              <Separator />
+              <div class="space-y-1.5">
+                <span class="text-xs text-muted-foreground">Accent</span>
+                <AccentPicker />
+              </div>
+              <div class="space-y-1.5">
+                <span class="text-xs text-muted-foreground">Radius</span>
+                <RadiusPicker />
               </div>
-              <input
-                :value="props.gridGap"
-                @input="emit('update:gridGap', Number(($event.target as HTMLInputElement).value))"
-                type="range"
-                min="4"
-                max="40"
-                step="4"
-                class="w-full accent-primary cursor-pointer"
-              />
             </div>
+          </PopoverContent>
+        </Popover>
 
-            <Separator />
+        <Separator orientation="vertical" class="hidden md:block mx-1 h-4" />
 
-            <!-- Accent -->
-            <div class="space-y-1.5">
-              <span class="text-xs text-muted-foreground">Accent</span>
-              <AccentPicker />
-            </div>
+        <!-- Desktop: theme toggle -->
+        <div class="hidden md:flex">
+          <ThemeToggle />
+        </div>
 
-            <!-- Radius -->
-            <div class="space-y-1.5">
-              <span class="text-xs text-muted-foreground">Radius</span>
-              <RadiusPicker />
-            </div>
-          </div>
-        </PopoverContent>
-      </Popover>
-
-      <!-- View toggle -->
-      <Button
-        variant="ghost"
-        size="icon"
-        class="h-8 w-8"
-        :class="props.viewMode === 'grid' ? 'text-primary' : 'text-muted-foreground hover:text-foreground'"
-        @click="emit('update:viewMode', 'grid')"
-      >
-        <LayoutGrid :size="15" />
-      </Button>
-      <Button
-        variant="ghost"
-        size="icon"
-        class="h-8 w-8"
-        :class="props.viewMode === 'list' ? 'text-primary' : 'text-muted-foreground hover:text-foreground'"
-        @click="emit('update:viewMode', 'list')"
-      >
-        <List :size="15" />
-      </Button>
-
-      <Separator orientation="vertical" class="mx-1 h-4" />
-
-      <ThemeToggle />
-    </div>
+        <!-- Mobile: overflow dropdown -->
+        <DropdownMenu>
+          <DropdownMenuTrigger as-child>
+            <Button variant="ghost" size="icon" class="md:hidden h-8 w-8 text-muted-foreground hover:text-foreground">
+              <MoreHorizontal :size="15" />
+            </Button>
+          </DropdownMenuTrigger>
+          <DropdownMenuContent align="end" class="w-44">
+            <DropdownMenuLabel class="text-xs text-muted-foreground">View</DropdownMenuLabel>
+            <DropdownMenuRadioGroup :model-value="props.viewMode" @update:model-value="emit('update:viewMode', $event as 'grid' | 'list')">
+              <DropdownMenuRadioItem value="grid">Grid</DropdownMenuRadioItem>
+              <DropdownMenuRadioItem value="list">List</DropdownMenuRadioItem>
+            </DropdownMenuRadioGroup>
+            <DropdownMenuSeparator />
+            <DropdownMenuItem @click="mobileDisplayOpen = true">
+              <SlidersHorizontal :size="14" class="mr-2" />
+              Display
+            </DropdownMenuItem>
+            <DropdownMenuSeparator />
+            <DropdownMenuItem @click="themeStore.toggleTheme()">
+              <component :is="themeStore.theme === 'dark' ? Sun : Moon" :size="14" class="mr-2" />
+              {{ themeStore.theme === 'dark' ? 'Light mode' : 'Dark mode' }}
+            </DropdownMenuItem>
+          </DropdownMenuContent>
+        </DropdownMenu>
+      </div>
+    </template>
   </header>
+
+  <!-- Mobile display settings sheet (portaled to body) -->
+  <Sheet v-model:open="mobileDisplayOpen">
+    <SheetContent side="bottom">
+      <SheetHeader>
+        <SheetTitle>Display</SheetTitle>
+      </SheetHeader>
+      <div class="space-y-4 px-4 pb-6">
+        <div class="space-y-1.5">
+          <div class="flex items-center justify-between">
+            <span class="text-xs text-muted-foreground">Cover size</span>
+            <span class="text-xs font-medium tabular-nums text-foreground">{{ props.coverSize }}px</span>
+          </div>
+          <input
+            :value="props.coverSize"
+            @input="emit('update:coverSize', Number(($event.target as HTMLInputElement).value))"
+            type="range"
+            min="80"
+            max="280"
+            step="10"
+            class="w-full accent-primary cursor-pointer"
+          />
+        </div>
+        <div class="space-y-1.5">
+          <div class="flex items-center justify-between">
+            <span class="text-xs text-muted-foreground">Grid gap</span>
+            <span class="text-xs font-medium tabular-nums text-foreground">{{ props.gridGap }}px</span>
+          </div>
+          <input
+            :value="props.gridGap"
+            @input="emit('update:gridGap', Number(($event.target as HTMLInputElement).value))"
+            type="range"
+            min="4"
+            max="40"
+            step="4"
+            class="w-full accent-primary cursor-pointer"
+          />
+        </div>
+        <Separator />
+        <div class="space-y-1.5">
+          <span class="text-xs text-muted-foreground">Accent</span>
+          <AccentPicker />
+        </div>
+        <div class="space-y-1.5">
+          <span class="text-xs text-muted-foreground">Radius</span>
+          <RadiusPicker />
+        </div>
+      </div>
+    </SheetContent>
+  </Sheet>
 </template>
diff --git a/client/src/features/book/composables/useGlobalSearch.ts b/client/src/features/book/composables/useGlobalSearch.ts
new file mode 100644
index 000000000..ab7477460
--- /dev/null
+++ b/client/src/features/book/composables/useGlobalSearch.ts
@@ -0,0 +1,46 @@
+import { ref, watch, type Ref } from 'vue'
+import { api } from '@/lib/api'
+
+export interface GlobalSearchResult {
+  id: number
+  title: string | null
+  authors: string[]
+  libraryId: number
+  libraryName: string
+}
+
+export function useGlobalSearch(query: Ref<string>) {
+  const results = ref<GlobalSearchResult[]>([])
+  const loading = ref(false)
+  let timer: ReturnType<typeof setTimeout> | null = null
+
+  watch(query, (q) => {
+    if (timer) clearTimeout(timer)
+    if (q.trim().length < 2) {
+      results.value = []
+      loading.value = false
+      return
+    }
+    loading.value = true
+    timer = setTimeout(async () => {
+      try {
+        const params = new URLSearchParams({ q: q.trim(), limit: '10' })
+        const res = await api(`/api/books/search?${params}`)
+        if (!res.ok) throw new Error(`HTTP ${res.status}`)
+        results.value = await res.json()
+      } catch {
+        results.value = []
+      } finally {
+        loading.value = false
+      }
+    }, 300)
+  })
+
+  function clear() {
+    if (timer) clearTimeout(timer)
+    results.value = []
+    loading.value = false
+  }
+
+  return { results, loading, clear }
+}
diff --git a/client/src/views/HomeView.vue b/client/src/views/HomeView.vue
index dad9739c7..9a47d431a 100644
--- a/client/src/views/HomeView.vue
+++ b/client/src/views/HomeView.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { computed, onMounted, onUnmounted, ref, watch } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
+import { Search, X } from 'lucide-vue-next'
 import BookCoverImage from '@/features/book/components/BookCoverImage.vue'
 import BookCoverCard from '@/features/book/components/BookCoverCard.vue'
 import AppHeader from '@/components/AppHeader.vue'
@@ -87,7 +88,6 @@ watch(search, () => {
         :title="title"
         :total="total"
         :loaded="books.length"
-        v-model:search="search"
         v-model:coverSize="coverSize"
         v-model:gridGap="gridGap"
         v-model:viewMode="viewMode"
@@ -96,6 +96,19 @@ watch(search, () => {
       <main class="flex-1 overflow-y-auto px-4 py-4" :class="backgroundClass">
         <div v-if="error" class="text-sm text-destructive mb-4">{{ error }}</div>
 
+        <!-- Library filter -->
+        <div class="relative mb-4 max-w-xs">
+          <Search class="absolute left-2.5 top-1/2 -translate-y-1/2 text-muted-foreground pointer-events-none" :size="13" />
+          <input
+            v-model="search"
+            placeholder="Filter library..."
+            class="w-full h-8 pl-8 pr-7 text-sm rounded-md border border-input bg-background text-foreground placeholder:text-muted-foreground focus:outline-none focus:ring-2 focus:ring-primary transition-shadow"
+          />
+          <button v-if="search" @click="search = ''" class="absolute right-2 top-1/2 -translate-y-1/2 text-muted-foreground hover:text-foreground">
+            <X :size="13" />
+          </button>
+        </div>
+
         <!-- Grid view -->
         <div
           v-if="viewMode === 'grid'"
diff --git a/server/src/db/migrations/meta/_journal.json b/server/src/db/migrations/meta/_journal.json
index ac0d0e297..26ec8a23c 100644
--- a/server/src/db/migrations/meta/_journal.json
+++ b/server/src/db/migrations/meta/_journal.json
@@ -5,7 +5,7 @@
     {
       "idx": 0,
       "version": "7",
-      "when": 1768503997010,
+      "when": 1768523691867,
       "tag": "0000_baseline",
       "breakpoints": true
     }
diff --git a/server/src/modules/book/book.controller.ts b/server/src/modules/book/book.controller.ts
index 16e215d78..16b88c389 100644
--- a/server/src/modules/book/book.controller.ts
+++ b/server/src/modules/book/book.controller.ts
@@ -7,6 +7,7 @@ import type { RequestUser } from '../../common/types/request-user';
 import { BookService } from './book.service';
 import { GetBooksDto } from './dto/get-books.dto';
 import { SaveProgressDto } from './dto/save-progress.dto';
+import { SearchBooksDto } from './dto/search-books.dto';
 
 @Controller('books')
 export class BookController {
@@ -17,6 +18,12 @@ export class BookController {
     return this.bookService.getCards(dto, user);
   }
 
+  // Must be before @Get(':id') so NestJS does not treat 'search' as an :id param
+  @Get('search')
+  searchBooks(@Query() dto: SearchBooksDto, @CurrentUser() user: RequestUser) {
+    return this.bookService.searchAcrossLibraries(dto.q, dto.limit ?? 10, user);
+  }
+
   @Get(':id/cover')
   async getCover(@Param('id', ParseIntPipe) id: number, @CurrentUser() user: RequestUser, @Res() reply: FastifyReply) {
     const coverPath = await this.bookService.getCoverPath(id, user);
diff --git a/server/src/modules/book/book.repository.ts b/server/src/modules/book/book.repository.ts
index 2d6df7b6e..b9041ff93 100644
--- a/server/src/modules/book/book.repository.ts
+++ b/server/src/modules/book/book.repository.ts
@@ -4,7 +4,7 @@ import { NodePgDatabase } from 'drizzle-orm/node-postgres';
 
 import { DB } from '../../db';
 import * as schema from '../../db/schema';
-import { authors, bookAuthors, bookFiles, bookMetadata, books, bookTags, readingProgress, tags } from '../../db/schema';
+import { authors, bookAuthors, bookFiles, bookMetadata, books, bookTags, libraries, readingProgress, tags } from '../../db/schema';
 
 type Db = NodePgDatabase<typeof schema>;
 
@@ -119,6 +119,51 @@ export class BookRepository {
     return row ?? null;
   }
 
+  async searchAcrossLibraries(libraryIds: number[], q: string, limit: number) {
+    if (libraryIds.length === 0) return [];
+
+    const rows = await this.db
+      .select({
+        id: books.id,
+        title: bookMetadata.title,
+        libraryId: books.libraryId,
+        libraryName: libraries.name,
+      })
+      .from(books)
+      .leftJoin(bookMetadata, eq(bookMetadata.bookId, books.id))
+      .innerJoin(libraries, eq(libraries.id, books.libraryId))
+      .where(and(inArray(books.libraryId, libraryIds), ilike(bookMetadata.title, `%${q}%`)))
+      .orderBy(bookMetadata.title)
+      .limit(limit);
+
+    const bookIds = rows.map((r) => r.id);
+
+    const authorRows =
+      bookIds.length > 0
+        ? await this.db
+            .select({ bookId: bookAuthors.bookId, name: authors.name })
+            .from(bookAuthors)
+            .innerJoin(authors, eq(authors.id, bookAuthors.authorId))
+            .where(inArray(bookAuthors.bookId, bookIds))
+            .orderBy(bookAuthors.displayOrder)
+        : [];
+
+    const authorsByBook = new Map<number, string[]>();
+    for (const row of authorRows) {
+      const list = authorsByBook.get(row.bookId) ?? [];
+      list.push(row.name);
+      authorsByBook.set(row.bookId, list);
+    }
+
+    return rows.map((r) => ({
+      id: r.id,
+      title: r.title,
+      authors: authorsByBook.get(r.id) ?? [],
+      libraryId: r.libraryId,
+      libraryName: r.libraryName,
+    }));
+  }
+
   async upsertProgress(userId: number, fileId: number, cfi: string | null, pageNumber: number | null, percentage: number) {
     await this.db
       .insert(readingProgress)
diff --git a/server/src/modules/book/book.service.ts b/server/src/modules/book/book.service.ts
index 5e955d109..5945be0ce 100644
--- a/server/src/modules/book/book.service.ts
+++ b/server/src/modules/book/book.service.ts
@@ -97,6 +97,12 @@ export class BookService {
     return { path: file.absolutePath, size, format: file.format ?? 'unknown' };
   }
 
+  async searchAcrossLibraries(q: string, limit: number, user: RequestUser) {
+    const libs = await this.libraryService.findAll(user);
+    const libraryIds = libs.map((l) => l.id);
+    return this.bookRepo.searchAcrossLibraries(libraryIds, q, limit);
+  }
+
   async getProgress(userId: number, fileId: number, user: RequestUser) {
     await this.verifyFileAccess(fileId, user);
     return this.bookRepo.findProgress(userId, fileId);
diff --git a/server/src/modules/book/dto/search-books.dto.ts b/server/src/modules/book/dto/search-books.dto.ts
new file mode 100644
index 000000000..1180d1663
--- /dev/null
+++ b/server/src/modules/book/dto/search-books.dto.ts
@@ -0,0 +1,15 @@
+import { Type } from 'class-transformer';
+import { IsInt, IsOptional, IsString, Max, Min, MinLength } from 'class-validator';
+
+export class SearchBooksDto {
+  @IsString()
+  @MinLength(1)
+  q: string;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  @Max(20)
+  limit?: number = 10;
+}