diff --git a/frontend/app/view/preview/preview-streaming.test.tsx b/frontend/app/view/preview/preview-streaming.test.tsx
new file mode 100644
index 0000000000..8faeed4364
--- /dev/null
+++ b/frontend/app/view/preview/preview-streaming.test.tsx
@@ -0,0 +1,40 @@
+// Copyright 2026, Command Line Inc.
+// SPDX-License-Identifier: Apache-2.0
+
+import { Provider, atom } from "jotai";
+import { renderToStaticMarkup } from "react-dom/server";
+import { describe, expect, it, vi } from "vitest";
+import { StreamingPreview } from "./preview-streaming";
+
+vi.mock("@/util/endpoints", () => ({
+    getWebServerEndpoint: () => "http://wave.test",
+}));
+
+vi.mock("@/util/waveutil", () => ({
+    formatRemoteUri: (path: string, conn: string) => `wsh://${conn}${path}`,
+}));
+
+describe("StreamingPreview", () => {
+    it("renders PDFs with an object/embed viewer instead of an iframe", () => {
+        const model = {
+            refreshCallback: null,
+            refreshVersion: atom(0),
+            connection: atom("local"),
+            statFile: atom({
+                path: "/docs/guide.pdf",
+                mimetype: "application/pdf",
+            }),
+        };
+
+        const markup = renderToStaticMarkup(
+            <Provider>
+                <StreamingPreview model={model as any} parentRef={{ current: null }} />
+            </Provider>
+        );
+
+        expect(markup).toContain("<object");
+        expect(markup).toContain("<embed");
+        expect(markup).not.toContain("<iframe");
+        expect(markup).toContain("http://wave.test/wave/stream-file?path=wsh%3A%2F%2Flocal%2Fdocs%2Fguide.pdf");
+    });
+});
diff --git a/frontend/app/view/preview/preview-streaming.tsx b/frontend/app/view/preview/preview-streaming.tsx
index 408da54de4..c9c5a54d26 100644
--- a/frontend/app/view/preview/preview-streaming.tsx
+++ b/frontend/app/view/preview/preview-streaming.tsx
@@ -1,4 +1,4 @@
-// Copyright 2025, Command Line Inc.
+// Copyright 2026, Command Line Inc.
 // SPDX-License-Identifier: Apache-2.0
 
 import { Button } from "@/app/element/button";
@@ -65,7 +65,9 @@ function StreamingPreview({ model }: SpecializedViewProps) {
     if (fileInfo.mimetype === "application/pdf") {
         return (
             <div className="flex flex-row h-full overflow-hidden items-center justify-center p-[5px]">
-                <iframe src={streamingUrl} width="100%" height="100%" name="pdfview" />
+                <object data={streamingUrl} type="application/pdf" width="100%" height="100%">
+                    <embed src={streamingUrl} type="application/pdf" width="100%" height="100%" />
+                </object>
             </div>
         );
     }