diff --git a/.env.example b/.env.example
index d9967c5..17a2c88 100644
--- a/.env.example
+++ b/.env.example
@@ -1,6 +1,9 @@
 # Public site origin used for SEO metadata, sitemap, and robots.txt.
 BASE_URL=https://guide.sudloh.com
 
+# Public AdSense publisher client ID. Leave unset to disable ads locally.
+NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID=ca-pub-9687404323559597
+
 # Local-only demo mode serves sanitized fixtures and bypasses external services.
 # Keep this false in every deployed environment.
 BUZZ_DEMO_MODE=false
diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 581bd04..8255476 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -10,6 +10,7 @@ on:
 
 env:
   BASE_URL: https://guide.sudloh.com
+  NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID: ca-pub-9687404323559597
   REGISTRY_IMAGE: registry.neko-piranha.ts.net/astral/buzz-sheet
   DEPLOY_NAMESPACE: buzz-sheet
   KUBE_API_SERVER: https://100.112.189.33:6443/
@@ -32,6 +33,7 @@ jobs:
           docker build \
             --target app \
             --build-arg BASE_URL="$BASE_URL" \
+            --build-arg NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID="$NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID" \
             --build-arg NEXT_DEPLOYMENT_ID=${{ gitea.sha }} \
             --build-arg VCS_REF=${{ gitea.sha }} \
             --tag ${{ env.REGISTRY_IMAGE }}:${{ gitea.sha }} \
diff --git a/Dockerfile b/Dockerfile
index 918e1f8..4f44637 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,8 +23,10 @@ FROM node:22-bookworm-slim AS next-builder
 WORKDIR /app
 ARG NEXT_DEPLOYMENT_ID=container-build
 ARG BASE_URL
+ARG NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID
 ENV BASE_URL=${BASE_URL}
 ENV NEXT_DEPLOYMENT_ID=${NEXT_DEPLOYMENT_ID}
+ENV NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID=${NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID}
 ENV NEXT_TELEMETRY_DISABLED=1
 COPY --from=dependencies /app/node_modules ./node_modules
 COPY . .
diff --git a/app/Ads.txt b/app/Ads.txt
deleted file mode 100644
index 0552972..0000000
--- a/app/Ads.txt
+++ /dev/null
@@ -1 +0,0 @@
-google.com, pub-9687404323559597, DIRECT, f08c47fec0942fa0
\ No newline at end of file
diff --git a/app/[character]/[page]/page.tsx b/app/[character]/[page]/page.tsx
index 0bd61b1..3fee79f 100644
--- a/app/[character]/[page]/page.tsx
+++ b/app/[character]/[page]/page.tsx
@@ -1,6 +1,7 @@
 import type { Metadata } from "next";
 import { notFound } from "next/navigation";
 
+import { GoogleAdsense } from "@/components/public/google-adsense";
 import { publicSections, StructuredGuideShell } from "@/components/public/structured-guide";
 import { getCachedPublicGuide } from "@/lib/cache/public";
 
@@ -25,5 +26,10 @@ export default async function GuideSectionPage({ params }: { params: Params }) {
   const { character, page } = await params;
   const guide = await getCachedPublicGuide(character);
   if (!guide || !publicSections(guide).some((section) => section.slug === page)) notFound();
-  return <StructuredGuideShell guide={guide} section={page} />;
+  return (
+    <>
+      <GoogleAdsense />
+      <StructuredGuideShell guide={guide} section={page} />
+    </>
+  );
 }
diff --git a/app/[character]/page.tsx b/app/[character]/page.tsx
index 61e0acb..f70b63f 100644
--- a/app/[character]/page.tsx
+++ b/app/[character]/page.tsx
@@ -1,6 +1,7 @@
 import type { Metadata } from "next";
 import { notFound } from "next/navigation";
 
+import { GoogleAdsense } from "@/components/public/google-adsense";
 import { StructuredGuideShell } from "@/components/public/structured-guide";
 import { getCachedPublicGuide } from "@/lib/cache/public";
 
@@ -31,5 +32,10 @@ export default async function GuideOverviewPage({
 }) {
   const guide = await getCachedPublicGuide((await params).character);
   if (!guide) notFound();
-  return <StructuredGuideShell guide={guide} />;
+  return (
+    <>
+      <GoogleAdsense />
+      <StructuredGuideShell guide={guide} />
+    </>
+  );
 }
diff --git a/app/page.tsx b/app/page.tsx
index d34fa5c..0ab4767 100644
--- a/app/page.tsx
+++ b/app/page.tsx
@@ -2,6 +2,7 @@ import { connection } from "next/server";
 import { Suspense } from "react";
 
 import { LiveRefresh } from "@/components/live-refresh";
+import { GoogleAdsense } from "@/components/public/google-adsense";
 import { SiteFooter } from "@/components/public/site-footer";
 import { StructuredDirectory } from "@/components/public/structured-directory";
 import { SiteHeader } from "@/components/public/site-header";
@@ -16,6 +17,7 @@ async function DirectoryContent() {
 export default function HomePage() {
   return (
     <div className="flex min-h-svh flex-col bg-background">
+      <GoogleAdsense />
       <LiveRefresh endpoint="/api/events/directory" />
       <SiteHeader />
       <main className="mx-auto flex w-full max-w-7xl flex-col gap-8 px-4 py-10 sm:px-6 sm:py-14">
diff --git a/components/public/google-adsense.tsx b/components/public/google-adsense.tsx
new file mode 100644
index 0000000..f86357a
--- /dev/null
+++ b/components/public/google-adsense.tsx
@@ -0,0 +1,30 @@
+"use client";
+
+import Script from "next/script";
+
+import { authClient } from "@/lib/auth/client";
+
+const clientId = process.env.NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID?.trim();
+
+export function GoogleAdsense() {
+  const { data: session, error, isPending } = authClient.useSession();
+
+  if (
+    process.env.NODE_ENV !== "production" ||
+    !clientId ||
+    isPending ||
+    error ||
+    session
+  ) {
+    return null;
+  }
+
+  return (
+    <Script
+      id="google-adsense"
+      src={`https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=${encodeURIComponent(clientId)}`}
+      strategy="afterInteractive"
+      crossOrigin="anonymous"
+    />
+  );
+}
diff --git a/public/ads.txt b/public/ads.txt
new file mode 100644
index 0000000..1ea23ef
--- /dev/null
+++ b/public/ads.txt
@@ -0,0 +1 @@
+google.com, pub-9687404323559597, DIRECT, f08c47fec0942fa0
diff --git a/tests/deployment-contract.test.ts b/tests/deployment-contract.test.ts
index f471b99..dc65b66 100644
--- a/tests/deployment-contract.test.ts
+++ b/tests/deployment-contract.test.ts
@@ -91,7 +91,12 @@ describe("production deployment contract", () => {
     expect(dockerfile.match(/^USER 1000:1000$/gmu)).toHaveLength(2);
     expect(dockerfile).toContain('ENTRYPOINT ["bun", "scripts/migrate.ts"]');
     expect(dockerfile).toContain('CMD ["bun", "server.js"]');
-    expect(dockerfile).toContain("ARG BASE_URL\nENV BASE_URL=${BASE_URL}");
+    expect(dockerfile).toContain("ARG BASE_URL");
+    expect(dockerfile).toContain("ENV BASE_URL=${BASE_URL}");
+    expect(dockerfile).toContain("ARG NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID");
+    expect(dockerfile).toContain(
+      "ENV NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID=${NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID}",
+    );
     expect(dockerfile).toContain("backend/discord.ts");
     expect(dockerfile).toContain("./worker/discord.js");
   });
@@ -106,6 +111,9 @@ describe("production deployment contract", () => {
     expect(workflow).toContain("kubectl kustomize k8s/");
     expect(workflow).toContain("--target app");
     expect(workflow).toContain('--build-arg BASE_URL="$BASE_URL"');
+    expect(workflow).toContain(
+      '--build-arg NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID="$NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID"',
+    );
     expect(workflow).toContain('\\"BASE_URL\\":\\"$BASE_URL\\"');
     expect(workflow).toContain("--target migration");
     expect(workflow).not.toContain("platforms: linux/arm64");
@@ -167,6 +175,9 @@ describe("environment template contract", () => {
       expect(environmentExample).toMatch(new RegExp(`^${key}=`, "mu"));
     }
     expect(environmentExample).toContain("BUZZ_DEMO_MODE=false");
+    expect(environmentExample).toContain(
+      "NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID=ca-pub-9687404323559597",
+    );
   });
 
   it("runs Discord catalog sync as an isolated worker", async () => {
diff --git a/tests/public-performance.test.ts b/tests/public-performance.test.ts
index 5409473..c06afce 100644
--- a/tests/public-performance.test.ts
+++ b/tests/public-performance.test.ts
@@ -55,4 +55,25 @@ describe("public rendering performance", () => {
       sitemap: "https://guide.example.test/sitemap.xml",
     });
   });
+
+  it("loads AdSense only after confirming the visitor is signed out", async () => {
+    const [adsense, home, guide, guideSection, adsTxt] = await Promise.all([
+      repositoryFile("components/public/google-adsense.tsx"),
+      repositoryFile("app/page.tsx"),
+      repositoryFile("app/[character]/page.tsx"),
+      repositoryFile("app/[character]/[page]/page.tsx"),
+      repositoryFile("public/ads.txt"),
+    ]);
+
+    expect(adsense).toContain("authClient.useSession()");
+    expect(adsense).toContain('process.env.NODE_ENV !== "production"');
+    expect(adsense).toMatch(/isPending \|\|\s+error \|\|\s+session/u);
+    expect(adsense).toContain("pagead2.googlesyndication.com");
+    expect(home).toContain("<GoogleAdsense />");
+    expect(guide).toContain("<GoogleAdsense />");
+    expect(guideSection).toContain("<GoogleAdsense />");
+    expect(adsTxt.trim()).toBe(
+      "google.com, pub-9687404323559597, DIRECT, f08c47fec0942fa0",
+    );
+  });
 });