diff --git a/src/apps/images/index.tsx b/src/apps/images/index.tsx
new file mode 100644
index 0000000..6d82e14
--- /dev/null
+++ b/src/apps/images/index.tsx
@@ -0,0 +1,185 @@
+import { useEffect, useMemo, useState } from 'react';
+import { useNostr } from '@nostrify/react';
+import { useQuery } from '@tanstack/react-query';
+import { ImagePlus, Loader2, Search, X } from 'lucide-react';
+import type { NostrEvent } from '@nostrify/nostrify';
+import { AppBody, AppLayout, AppToolbar, EmptyState } from '@/components/os/AppChrome';
+import { AuthorLine } from '@/components/nostr/AuthorLine';
+import { Composer } from '@/apps/feed/Composer';
+import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
+import { Skeleton } from '@/components/ui/skeleton';
+import { Textarea } from '@/components/ui/textarea';
+import { useCurrentUser } from '@/hooks/useCurrentUser';
+import { useNostrPublish } from '@/hooks/useNostrPublish';
+import { useToast } from '@/hooks/useToast';
+import { useUploadFile } from '@/hooks/useUploadFile';
+import { absoluteTime } from '@/lib/nostrUtils';
+import { isPicturePost, pictureTags, pictureUrl } from '@/lib/picturePosts';
+import { cn } from '@/lib/utils';
+import type { AppProps } from '@/os/types';
+
+const PAGE_SIZE = 80;
+
+function usePictures(tag: string) {
+  const { nostr } = useNostr();
+  return useQuery<NostrEvent[]>({
+    queryKey: ['nostr', 'images', tag],
+    queryFn: async ({ signal }) => {
+      const events = await nostr.query([{
+        kinds: [20],
+        ...(tag ? { '#t': [tag] } : {}),
+        limit: PAGE_SIZE,
+      }], { signal: AbortSignal.any([signal, AbortSignal.timeout(6000)]) });
+      return events.filter(isPicturePost).sort((a, b) => b.created_at - a.created_at);
+    },
+    staleTime: 30_000,
+  });
+}
+
+function usePicture(id: string | undefined) {
+  const { nostr } = useNostr();
+  return useQuery<NostrEvent | null>({
+    queryKey: ['nostr', 'image', id ?? ''],
+    enabled: Boolean(id),
+    queryFn: async ({ signal }) => {
+      const events = await nostr.query([{ ids: [id!], kinds: [20] }], {
+        signal: AbortSignal.any([signal, AbortSignal.timeout(6000)]),
+      });
+      return events.find(isPicturePost) ?? null;
+    },
+    staleTime: 5 * 60_000,
+  });
+}
+
+function useReplies(id: string | undefined) {
+  const { nostr } = useNostr();
+  return useQuery<NostrEvent[]>({
+    queryKey: ['nostr', 'image-replies', id ?? ''],
+    enabled: Boolean(id),
+    queryFn: async ({ signal }) => {
+      const events = await nostr.query([{ kinds: [1], '#e': [id!], limit: 100 }], {
+        signal: AbortSignal.any([signal, AbortSignal.timeout(6000)]),
+      });
+      return events.filter((event) => event.content.trim()).sort((a, b) => a.created_at - b.created_at);
+    },
+    staleTime: 30_000,
+  });
+}
+
+export default function ImagesApp({ params, setParams, setTitle }: AppProps) {
+  const [search, setSearch] = useState('');
+  const [tag, setTag] = useState('');
+  const selected = usePicture(params.id);
+  const replies = useReplies(params.id);
+
+  useEffect(() => { setTitle(params.id ? 'Image' : 'Images'); }, [params.id, setTitle]);
+
+  if (params.id) {
+    return <PictureDetail event={selected.data} loading={selected.isLoading} replies={replies.data ?? []} onBack={() => setParams({})} onRefresh={() => replies.refetch()} />;
+  }
+
+  return <PictureFeed
+    tag={tag}
+    search={search}
+    onTagChange={setTag}
+    onSearchChange={setSearch}
+    onOpen={(id) => setParams({ id })}
+  />;
+}
+
+function PictureFeed({ tag, search, onTagChange, onSearchChange, onOpen }: {
+  tag: string; search: string; onTagChange: (tag: string) => void; onSearchChange: (value: string) => void; onOpen: (id: string) => void;
+}) {
+  const { user } = useCurrentUser();
+  const query = usePictures(tag);
+  const normalizedSearch = search.trim().toLocaleLowerCase();
+  const pictures = useMemo(() => (query.data ?? []).filter((event) =>
+    !normalizedSearch || `${event.content} ${pictureTags(event).join(' ')}`.toLocaleLowerCase().includes(normalizedSearch),
+  ), [query.data, normalizedSearch]);
+
+  return (
+    <AppLayout>
+      <AppToolbar className="gap-2">
+        <div className="relative min-w-0 flex-1">
+          <Search className="pointer-events-none absolute left-2.5 top-2 size-4 text-muted-foreground" aria-hidden />
+          <Input aria-label="Search picture posts" value={search} onChange={(event) => onSearchChange(event.target.value)} placeholder="Search pictures" className="h-8 pl-8 text-sm" />
+        </div>
+        <Button size="sm" className="h-8 gap-1.5" onClick={() => document.getElementById('image-upload')?.click()} disabled={!user}>
+          <ImagePlus className="size-4" aria-hidden /> Upload
+        </Button>
+      </AppToolbar>
+      <AppBody>
+        {user && <PictureComposer onPublished={() => query.refetch()} />}
+        <div className="flex min-h-10 items-center gap-2 border-b border-border px-3 py-2">
+          <Input aria-label="Filter by hashtag" value={tag} onChange={(event) => onTagChange(event.target.value.replace(/^#/, '').trim())} placeholder="Filter #tag" className="h-7 max-w-44 text-xs" />
+          {tag && <Button variant="ghost" size="sm" className="h-7 gap-1 px-2 text-xs" onClick={() => onTagChange('')}><X className="size-3" aria-hidden /> Clear filter</Button>}
+          {query.isFetching && <Loader2 className="ml-auto size-3.5 animate-spin text-muted-foreground" aria-label="Loading pictures" />}
+        </div>
+        {query.isLoading ? <PictureSkeleton /> : query.isError ? (
+          <EmptyState title="Couldn’t load pictures" hint="Check your relays and try again." action={<Button size="sm" onClick={() => query.refetch()}>Try again</Button>} />
+        ) : pictures.length ? (
+          <div className="columns-2 gap-2 p-2 sm:columns-3 lg:columns-4">
+            {pictures.map((event) => <PictureTile key={event.id} event={event} onOpen={onOpen} />)}
+          </div>
+        ) : <EmptyState title={search || tag ? 'No matching pictures' : 'No pictures yet'} hint={search || tag ? 'Try a different search or clear the filter.' : 'Your relays have not returned any picture posts.'} />}
+      </AppBody>
+    </AppLayout>
+  );
+}
+
+function PictureTile({ event, onOpen }: { event: NostrEvent; onOpen: (id: string) => void }) {
+  const url = pictureUrl(event)!;
+  return <button type="button" onClick={() => onOpen(event.id)} className="group mb-2 block w-full break-inside-avoid overflow-hidden rounded-lg bg-muted text-left focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-ring">
+    <img src={url} alt={event.content || 'Picture post'} loading="lazy" className="w-full object-cover transition duration-300 motion-safe:group-hover:scale-[1.02]" />
+    <div className="space-y-1 px-2.5 py-2"><AuthorLine pubkey={event.pubkey} createdAt={event.created_at} size="sm" /></div>
+  </button>;
+}
+
+function PictureDetail({ event, loading, replies, onBack, onRefresh }: { event: NostrEvent | null | undefined; loading: boolean; replies: NostrEvent[]; onBack: () => void; onRefresh: () => void }) {
+  const { user } = useCurrentUser();
+  if (loading) return <AppLayout><AppToolbar><Button variant="ghost" size="sm" onClick={onBack}>All images</Button></AppToolbar><AppBody><PictureSkeleton /></AppBody></AppLayout>;
+  if (!event) return <AppLayout><AppToolbar><Button variant="ghost" size="sm" onClick={onBack}>All images</Button></AppToolbar><EmptyState title="Picture not found" hint="None of your relays returned this picture post." /></AppLayout>;
+  const url = pictureUrl(event)!;
+  const replyTags = [['e', event.id, '', 'root'], ['p', event.pubkey]];
+  return <AppLayout><AppToolbar><Button variant="ghost" size="sm" onClick={onBack}>All images</Button></AppToolbar><AppBody>
+    <article className="mx-auto max-w-3xl">
+      <img src={url} alt={event.content || 'Picture post'} className="max-h-[65vh] w-full bg-muted object-contain" />
+      <div className="space-y-3 p-4"><AuthorLine pubkey={event.pubkey} createdAt={event.created_at} /><p className="whitespace-pre-wrap text-sm">{event.content}</p><p className="text-xs text-muted-foreground">{absoluteTime(event.created_at)}</p>
+        {pictureTags(event).length > 0 && <div className="flex flex-wrap gap-1">{pictureTags(event).map((tag) => <span key={tag} className="rounded-full bg-secondary px-2 py-0.5 text-xs text-secondary-foreground">#{tag}</span>)}</div>}
+      </div>
+      {user && <Composer replyTags={replyTags} placeholder="Write a reply…" onPublished={onRefresh} />}
+      {replies.length ? <div>{replies.map((reply) => <div key={reply.id} className="border-t border-border px-4 py-3"><AuthorLine pubkey={reply.pubkey} createdAt={reply.created_at} /><p className="mt-2 pl-9 text-sm whitespace-pre-wrap">{reply.content}</p></div>)}</div> : <EmptyState title="No replies yet" hint={user ? 'Be the first to reply.' : 'Sign in to reply.'} />}
+    </article>
+  </AppBody></AppLayout>;
+}
+
+function PictureComposer({ onPublished }: { onPublished: () => void }) {
+  const upload = useUploadFile();
+  const publish = useNostrPublish();
+  const { toast } = useToast();
+  const [file, setFile] = useState<File | null>(null);
+  const [description, setDescription] = useState('');
+  const publishPicture = async () => {
+    if (!file) return;
+    try {
+      const uploadTags = await upload.mutateAsync(file);
+      const url = uploadTags.find(([name, value]) => name === 'url' && value)?.[1];
+      if (!url) throw new Error('Upload did not return a URL.');
+      const imeta = ['imeta', `url ${url}`, ...uploadTags
+        .filter(([name, value]) => name !== 'url' && value)
+        .map(([name, value]) => `${name} ${value}`)];
+      await publish.mutateAsync({ kind: 20, content: description.trim(), tags: [imeta] });
+      setFile(null); setDescription(''); toast({ title: 'Picture published' }); onPublished();
+    } catch (error) { toast({ title: 'Could not publish picture', description: error instanceof Error ? error.message : 'Upload failed.', variant: 'destructive' }); }
+  };
+  return <div className="space-y-2 border-b border-border p-3">
+    <input id="image-upload" type="file" accept="image/*" className="sr-only" onChange={(event) => setFile(event.target.files?.[0] ?? null)} />
+    <div className="flex items-center gap-2"><span className="min-w-0 flex-1 truncate text-sm text-muted-foreground">{file?.name ?? 'Choose an image to share'}</span><Button variant="outline" size="sm" onClick={() => document.getElementById('image-upload')?.click()}>Choose image</Button></div>
+    {file && <><Textarea value={description} onChange={(event) => setDescription(event.target.value)} placeholder="Describe your picture (optional)" rows={2} className="resize-none text-sm" /><Button size="sm" onClick={() => void publishPicture()} disabled={upload.isPending || publish.isPending}>{upload.isPending || publish.isPending ? <Loader2 className="animate-spin" aria-label="Publishing picture" /> : 'Publish picture'}</Button></>}
+  </div>;
+}
+
+function PictureSkeleton() {
+  return <div className="columns-2 gap-2 p-2 sm:columns-3 lg:columns-4">{Array.from({ length: 12 }).map((_, index) => <Skeleton key={index} className={cn('mb-2 w-full break-inside-avoid rounded-lg', index % 3 === 0 ? 'h-52' : index % 3 === 1 ? 'h-36' : 'h-44')} />)}</div>;
+}
diff --git a/src/lib/picturePosts.test.ts b/src/lib/picturePosts.test.ts
new file mode 100644
index 0000000..bfe4a9d
--- /dev/null
+++ b/src/lib/picturePosts.test.ts
@@ -0,0 +1,23 @@
+import { describe, expect, it } from 'vitest';
+import type { NostrEvent } from '@nostrify/nostrify';
+import { isPicturePost, pictureTags, pictureUrl } from './picturePosts';
+
+function event(kind: number, tags: string[][]): NostrEvent {
+  return { id: 'id', pubkey: 'author', created_at: 0, kind, tags, content: '', sig: '' };
+}
+
+describe('picture posts', () => {
+  it('accepts a Kind 20 post with a safe NIP-68 image URL', () => {
+    const post = event(20, [['imeta', 'url https://images.example/picture.jpg'], ['t', 'sunset']]);
+    expect(pictureUrl(post)).toBe('https://images.example/picture.jpg');
+    expect(isPicturePost(post)).toBe(true);
+    expect(pictureTags(post)).toEqual(['sunset']);
+  });
+
+  it('rejects non-picture kinds and unsafe image URLs', () => {
+    expect(isPicturePost(event(1, [['imeta', 'url https://images.example/picture.jpg']]))).toBe(false);
+    expect(isPicturePost(event(20, [['imeta', 'url javascript:alert(1)']]))).toBe(false);
+    expect(isPicturePost(event(20, [['imeta', 'url mailto:image@example.com']]))).toBe(false);
+    expect(isPicturePost(event(20, [['imeta', 'url /picture.jpg']]))).toBe(false);
+  });
+});
diff --git a/src/lib/picturePosts.ts b/src/lib/picturePosts.ts
new file mode 100644
index 0000000..41a0cf4
--- /dev/null
+++ b/src/lib/picturePosts.ts
@@ -0,0 +1,30 @@
+import type { NostrEvent } from '@nostrify/nostrify';
+import { sanitizeUrl } from './nostrUtils';
+
+/** Returns the primary, safe media URL from a NIP-68 `imeta` tag. */
+export function pictureUrl(event: NostrEvent): string | undefined {
+  if (event.kind !== 20) return undefined;
+
+  const metadata = event.tags.find(([name]) => name === 'imeta');
+  const url = metadata?.find((value) => value.startsWith('url '))?.slice(4);
+  if (!url) return undefined;
+
+  try {
+    const parsed = new URL(url);
+    if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') return undefined;
+    return sanitizeUrl(parsed.href);
+  } catch {
+    return undefined;
+  }
+}
+
+/** Picture posts are Kind 20 events with an image the client can safely render. */
+export function isPicturePost(event: NostrEvent): boolean {
+  return Boolean(pictureUrl(event));
+}
+
+export function pictureTags(event: NostrEvent): string[] {
+  return event.tags
+    .filter(([name, value]) => name === 't' && Boolean(value))
+    .map(([, value]) => value);
+}
diff --git a/src/os/registry.ts b/src/os/registry.ts
index c9c8473..16fc5c7 100644
--- a/src/os/registry.ts
+++ b/src/os/registry.ts
@@ -1,5 +1,5 @@
 import { lazy } from 'react';
-import { Activity, Bookmark, BookOpen, CalendarDays, FileText, Info, Link2, Radio, Rss, Search, Settings, Sparkles, User } from 'lucide-react';
+import { Activity, Bookmark, BookOpen, CalendarDays, FileText, Image, Info, Link2, Radio, Rss, Search, Settings, Sparkles, User } from 'lucide-react';
 import type { AppDefinition } from './types';
 
 /**
@@ -59,6 +59,16 @@ export const APPS: AppDefinition[] = [
     defaultSize: { width: 780, height: 760 },
     minSize: { width: 360, height: 320 },
   },
+  {
+    id: 'images',
+    title: 'Images',
+    description: 'Discover and share picture posts on Nostr',
+    icon: Image,
+    category: 'social',
+    component: lazy(() => import('@/apps/images')),
+    defaultSize: { width: 820, height: 720 },
+    minSize: { width: 360, height: 360 },
+  },
   {
     id: 'bookmarks',
     title: 'Bookmarks',