diff --git a/src/features/extensions/components/ExtensionLibrary.svelte b/src/features/extensions/components/ExtensionLibrary.svelte
index 6e79655..3d6daa9 100644
--- a/src/features/extensions/components/ExtensionLibrary.svelte
+++ b/src/features/extensions/components/ExtensionLibrary.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-  import { ArrowLeft, MagnifyingGlass, GearSix, Swap } from "phosphor-svelte";
+  import { ArrowLeft, MagnifyingGlass, GearSix, Swap, Funnel, Check } from "phosphor-svelte";
   import Thumbnail           from "@shared/manga/Thumbnail.svelte";
   import { resolvedCover }   from "@core/cover/coverResolver";
   import { gql }             from "@api/client";
@@ -29,14 +29,24 @@
   let loading  = $state(true);
   let search   = $state("");
 
+  type ContentFilter = "unread" | "downloaded";
+  let activeFilters = $state<Partial<Record<ContentFilter, boolean>>>({});
+  let filterOpen    = $state(false);
+
+  const hasActiveFilters = $derived(Object.values(activeFilters).some(Boolean));
+
   let migrateTarget: { sourceId: string; sourceName: string; iconUrl: string; manga: LibraryManga[] } | null = $state(null);
 
   const allManga = $derived(groups.flatMap(g => g.manga));
-  const filtered = $derived(
-    search.trim()
-      ? allManga.filter(m => m.title.toLowerCase().includes(search.toLowerCase()))
-      : allManga
-  );
+
+  const filtered = $derived((() => {
+    let items = allManga;
+    const q = search.trim().toLowerCase();
+    if (q) items = items.filter(m => m.title.toLowerCase().includes(q));
+    if (activeFilters.unread)     items = items.filter(m => m.unreadCount > 0);
+    if (activeFilters.downloaded) items = items.filter(m => m.downloadCount > 0);
+    return items;
+  })());
 
   let sourceNodes: SourceNode[] = $state([]);
 
@@ -56,6 +66,14 @@
     }
   }
 
+  function toggleFilter(f: ContentFilter) {
+    activeFilters = { ...activeFilters, [f]: !activeFilters[f] };
+  }
+
+  function clearFilters() {
+    activeFilters = {};
+  }
+
   function openMigrate(group: SourceLibrary) {
     const node = sourceNodes.find(s => s.id === group.sourceId);
     migrateTarget = {
@@ -65,6 +83,20 @@
       manga:      group.manga,
     };
   }
+
+  $effect(() => {
+    if (!filterOpen) return;
+    function onOutside(e: MouseEvent) {
+      if (!(e.target as HTMLElement).closest(".filter-wrap")) filterOpen = false;
+    }
+    setTimeout(() => document.addEventListener("mousedown", onOutside, true), 0);
+    return () => document.removeEventListener("mousedown", onOutside, true);
+  });
+
+  const CONTENT_FILTERS: [ContentFilter, string][] = [
+    ["unread",     "Unread"],
+    ["downloaded", "Downloaded"],
+  ];
 </script>
 
 <div class="root">
@@ -80,17 +112,56 @@
       <span class="title">{extensionName}</span>
     </div>
     {#if !loading}
-      <span class="count-badge">{allManga.length}</span>
+      <span class="count-badge">{filtered.length}{filtered.length !== allManga.length ? ` / ${allManga.length}` : ""}</span>
     {/if}
-    <div class="search-wrap">
-      <MagnifyingGlass size={12} class="search-icon" weight="light" />
-      <input class="search" placeholder="Search" bind:value={search} autocomplete="off" />
+    <div class="header-right">
+      <div class="search-wrap">
+        <MagnifyingGlass size={12} class="search-icon" weight="light" />
+        <input class="search" placeholder="Search" bind:value={search} autocomplete="off" />
+      </div>
+
+      <div class="filter-wrap">
+        <button
+          class="filter-btn"
+          class:filter-btn-active={hasActiveFilters}
+          title="Filter"
+          onclick={() => filterOpen = !filterOpen}
+        >
+          <Funnel size={13} weight={hasActiveFilters ? "fill" : "bold"} />
+        </button>
+        {#if filterOpen}
+          <div class="filter-panel" role="menu">
+            <div class="panel-header">
+              <span class="panel-heading">Filter</span>
+              {#if hasActiveFilters}
+                <button class="panel-clear-btn" onclick={clearFilters}>Clear all</button>
+              {/if}
+            </div>
+            <div class="panel-divider"></div>
+            <p class="panel-label">Content</p>
+            {#each CONTENT_FILTERS as [f, label]}
+              <button
+                class="panel-item"
+                class:panel-item-active={activeFilters[f]}
+                role="menuitem"
+                onclick={() => toggleFilter(f)}
+              >
+                <span class="panel-check" class:panel-check-on={activeFilters[f]}>
+                  {#if activeFilters[f]}<Check size={9} weight="bold" />{/if}
+                </span>
+                {label}
+              </button>
+            {/each}
+          </div>
+        {/if}
+      </div>
+
+      {#if sources.length > 0}
+        <button class="header-btn" onclick={onSettings} title="Extension settings">
+          <GearSix size={14} weight="bold" />
+        </button>
+      {/if}
     </div>
-    {#if sources.length > 0}
-      <button class="header-btn" onclick={onSettings} title="Extension settings">
-        <GearSix size={14} weight="bold" />
-      </button>
-    {/if}
   </div>
 
   <div class="content">
@@ -181,6 +252,7 @@
   :global(.header-icon) { width: 24px; height: 24px; border-radius: var(--radius-sm); object-fit: cover; flex-shrink: 0; background: var(--bg-raised); }
 
   .header { display: flex; align-items: center; gap: var(--sp-3); padding: var(--sp-4) var(--sp-6); border-bottom: 1px solid var(--border-dim); flex-shrink: 0; }
+  .header-right { display: flex; align-items: center; gap: var(--sp-2); margin-left: auto; }
 
   .header-btn { display: flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: var(--radius-md); color: var(--text-faint); flex-shrink: 0; transition: color var(--t-base), background var(--t-base); }
   .header-btn:hover { color: var(--text-primary); background: var(--bg-raised); }
@@ -191,12 +263,31 @@
 
   .count-badge { font-family: var(--font-ui); font-size: var(--text-2xs); letter-spacing: var(--tracking-wide); padding: 2px 8px; border-radius: var(--radius-sm); background: var(--bg-overlay); border: 1px solid var(--border-dim); color: var(--text-muted); flex-shrink: 0; }
 
-  .search-wrap { position: relative; display: flex; align-items: center; margin-left: auto; }
+  .search-wrap { position: relative; display: flex; align-items: center; }
   .search-wrap :global(.search-icon) { position: absolute; left: 9px; color: var(--text-faint); pointer-events: none; }
   .search { background: var(--bg-raised); border: 1px solid var(--border-dim); border-radius: var(--radius-md); padding: 5px 10px 5px 26px; color: var(--text-primary); font-size: var(--text-sm); width: 160px; outline: none; transition: border-color var(--t-base); }
   .search::placeholder { color: var(--text-faint); }
   .search:focus { border-color: var(--border-strong); }
 
+  .filter-wrap { position: relative; }
+  .filter-btn { display: flex; align-items: center; justify-content: center; width: 30px; height: 30px; border-radius: var(--radius-md); border: 1px solid var(--border-dim); background: var(--bg-raised); color: var(--text-faint); cursor: pointer; flex-shrink: 0; transition: color var(--t-base), border-color var(--t-base), background var(--t-base); }
+  .filter-btn:hover { color: var(--text-primary); border-color: var(--border-strong); }
+  .filter-btn-active { color: var(--accent-fg); border-color: var(--accent-dim); background: var(--accent-muted); }
+
+  .filter-panel { position: absolute; top: calc(100% + 6px); right: 0; z-index: 9999; min-width: 200px; background: var(--bg-raised); border: 1px solid var(--border-base); border-radius: var(--radius-lg); padding: var(--sp-1); box-shadow: 0 8px 32px rgba(0,0,0,0.5); animation: fadeIn 0.1s ease both; }
+  .panel-header { display: flex; align-items: center; justify-content: space-between; padding: 6px 10px 4px; }
+  .panel-heading { font-family: var(--font-ui); font-size: var(--text-xs); letter-spacing: var(--tracking-wide); color: var(--text-secondary); font-weight: var(--weight-medium, 500); }
+  .panel-clear-btn { font-family: var(--font-ui); font-size: var(--text-2xs); letter-spacing: var(--tracking-wide); color: var(--text-faint); background: none; border: none; cursor: pointer; padding: 0; transition: color var(--t-base); }
+  .panel-clear-btn:hover { color: var(--color-error); }
+  .panel-divider { height: 1px; background: var(--border-dim); margin: 4px 2px; }
+  .panel-label { font-family: var(--font-ui); font-size: var(--text-2xs); letter-spacing: var(--tracking-wider); text-transform: uppercase; color: var(--text-faint); padding: 4px 8px 8px; }
+  .panel-item { display: flex; align-items: center; gap: var(--sp-2); width: 100%; padding: 7px 10px; border-radius: var(--radius-sm); border: none; background: transparent; color: var(--text-muted); font-family: var(--font-ui); font-size: var(--text-xs); cursor: pointer; text-align: left; transition: background var(--t-base), color var(--t-base); }
+  .panel-item:hover { background: var(--bg-overlay); color: var(--text-primary); }
+  .panel-item-active { color: var(--accent-fg); background: var(--accent-muted); font-weight: var(--weight-medium, 500); }
+  .panel-item-active:hover { background: var(--accent-dim); }
+  .panel-check { width: 13px; height: 13px; border-radius: 2px; border: 1px solid var(--border-strong); background: transparent; flex-shrink: 0; display: flex; align-items: center; justify-content: center; color: var(--bg-base); transition: background var(--t-base), border-color var(--t-base); }
+  .panel-check-on { background: var(--accent); border-color: var(--accent); }
+
   .content { flex: 1; overflow-y: auto; padding: var(--sp-4) var(--sp-6) var(--sp-6); will-change: scroll-position; display: flex; flex-direction: column; gap: var(--sp-3); }
 
   .source-groups { display: flex; flex-direction: column; gap: var(--sp-1); }
@@ -237,4 +328,6 @@
   .title-skeleton { height: 12px; margin-top: var(--sp-2); width: 80%; border-radius: var(--radius-sm); }
 
   .empty { display: flex; align-items: center; justify-content: center; height: 60%; color: var(--text-muted); font-size: var(--text-sm); }
+
+  @keyframes fadeIn { from { opacity: 0 } to { opacity: 1 } }
 </style>
\ No newline at end of file