diff --git a/packages/web/src/components/chat/AttachmentRenderer.tsx b/packages/web/src/components/chat/AttachmentRenderer.tsx
new file mode 100644
index 00000000..b1cb7de6
--- /dev/null
+++ b/packages/web/src/components/chat/AttachmentRenderer.tsx
@@ -0,0 +1,110 @@
+import React from 'react';
+import type { Attachment } from '@backspace/shared';
+import { useUIStore } from '../../stores/uiStore';
+
+interface AttachmentRendererProps {
+  attachment: Attachment;
+}
+
+function formatFileSize(bytes: number): string {
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1048576) return `${(bytes / 1024).toFixed(1)} KB`;
+  return `${(bytes / 1048576).toFixed(1)} MB`;
+}
+
+export function AttachmentRenderer({ attachment }: AttachmentRendererProps) {
+  const openImagePreview = useUIStore((s) => s.openImagePreview);
+
+  const attUrl =
+    attachment.filename.startsWith('http') || attachment.filename.startsWith('/')
+      ? attachment.filename
+      : `/api/uploads/${attachment.filename}`;
+
+  const thumbUrl = attachment.thumbnailFilename
+    ? attachment.thumbnailFilename.startsWith('http') || attachment.thumbnailFilename.startsWith('/')
+      ? attachment.thumbnailFilename
+      : `/api/uploads/${attachment.thumbnailFilename}`
+    : null;
+
+  const { mimetype, originalName, size } = attachment;
+
+  if (mimetype.startsWith('image/')) {
+    return (
+      <div className="max-w-fit mt-1 rounded-lg overflow-hidden border border-white/[0.06]">
+        <img
+          src={thumbUrl ?? attUrl}
+          alt={originalName}
+          className="max-w-full max-h-[350px] object-contain cursor-pointer hover:brightness-95 transition-all"
+          onClick={() => openImagePreview(attUrl)}
+          loading="lazy"
+        />
+      </div>
+    );
+  }
+
+  if (mimetype.startsWith('video/')) {
+    return (
+      <div className="mt-1 max-w-[520px] rounded-lg overflow-hidden border border-white/[0.06]">
+        <video
+          controls
+          preload="none"
+          poster={thumbUrl ?? undefined}
+          className="max-w-full max-h-[400px] rounded-lg"
+        >
+          <source src={attUrl} type={mimetype} />
+          Your browser does not support video playback.
+        </video>
+      </div>
+    );
+  }
+
+  if (mimetype.startsWith('audio/')) {
+    return (
+      <div className="mt-1 flex flex-col p-3 bg-surface-channel/50 rounded-lg border border-border-hard max-w-[420px]">
+        <div className="flex items-center gap-3">
+          <div className="p-2 bg-surface-base rounded text-txt-tertiary flex-shrink-0">
+            <svg className="w-6 h-6" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+              <path
+                strokeLinecap="round"
+                strokeLinejoin="round"
+                strokeWidth={1.5}
+                d="M9 19V6l12-3v13M9 19c0 1.105-1.343 2-3 2s-3-.895-3-2 1.343-2 3-2 3 .895 3 2zm12-3c0 1.105-1.343 2-3 2s-3-.895-3-2 1.343-2 3-2 3 .895 3 2zM9 10l12-3"
+              />
+            </svg>
+          </div>
+          <div className="min-w-0">
+            <p className="text-txt-primary text-[14px] font-medium truncate">{originalName}</p>
+            <p className="text-[12px] text-txt-tertiary">{formatFileSize(size)}</p>
+          </div>
+        </div>
+        <audio controls preload="metadata" className="w-full mt-2 h-8">
+          <source src={attUrl} type={mimetype} />
+          Your browser does not support audio playback.
+        </audio>
+      </div>
+    );
+  }
+
+  return (
+    <a
+      href={attUrl}
+      download={originalName}
+      className="flex items-center gap-3 p-4 bg-surface-channel/50 rounded-lg border border-border-hard hover:bg-interactive-hover transition-all max-w-[400px] mt-1 group/att"
+    >
+      <div className="p-2 bg-surface-base rounded text-txt-tertiary group-hover/att:text-txt-primary transition-colors">
+        <svg className="w-8 h-8" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+          <path
+            strokeLinecap="round"
+            strokeLinejoin="round"
+            strokeWidth={1.5}
+            d="M12 10v6m0 0l-3-3m3 3l3-3M3 17V7a2 2 0 012-2h6l2 2h6a2 2 0 012 2v8a2 2 0 01-2 2H5a2 2 0 01-2-2z"
+          />
+        </svg>
+      </div>
+      <div className="min-w-0">
+        <p className="text-txt-link text-[15px] font-medium truncate hover:underline">{originalName}</p>
+        <p className="text-[12px] text-txt-tertiary font-medium">{formatFileSize(size)}</p>
+      </div>
+    </a>
+  );
+}