diff --git a/site/assets/account.html b/site/assets/account.html
index e722408..d738294 100644
--- a/site/assets/account.html
+++ b/site/assets/account.html
@@ -8,6 +8,7 @@
   <meta name="referrer" content="no-referrer">
   <title>Your account — readm3</title>
   <link rel="icon" href="/favicon.svg" type="image/svg+xml">
+  <link rel="manifest" href="/manifest.webmanifest">
   <link rel="stylesheet" href="__ACCOUNT_STYLES__">
   <script type="module" src="__ACCOUNT_SCRIPT__"></script>
   <script defer src="__PROFILE_SCRIPT__"></script>
diff --git a/site/assets/admin.html b/site/assets/admin.html
index a2364f8..7e87810 100644
--- a/site/assets/admin.html
+++ b/site/assets/admin.html
@@ -3,7 +3,7 @@
 <head>
 <meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><meta name="robots" content="noindex,nofollow"><meta name="referrer" content="no-referrer">
 <title>Your Markdown workspace — readm3</title>
-<link rel="icon" href="/favicon.svg"><link rel="stylesheet" href="__STYLES__"><link rel="stylesheet" href="__VIEWER_STYLES__"><link rel="stylesheet" href="__ADMIN_STYLES__">
+<link rel="icon" href="/favicon.svg"><link rel="manifest" href="/manifest.webmanifest"><link rel="stylesheet" href="__STYLES__"><link rel="stylesheet" href="__VIEWER_STYLES__"><link rel="stylesheet" href="__ADMIN_STYLES__">
 <script type="module" src="__ADMIN_SCRIPT__"></script>
 </head>
 <body class="reader-app admin-app">
diff --git a/site/build.ts b/site/build.ts
index bf9d765..a5fefb5 100644
--- a/site/build.ts
+++ b/site/build.ts
@@ -182,6 +182,8 @@ function shell(options: { title: string; description: string; path: string; main
 <meta name="description" content="${escape(options.description)}">
 <link rel="canonical" href="${canonical}">
 <link rel="icon" href="/favicon.svg" type="image/svg+xml">
+<link rel="manifest" href="/manifest.webmanifest">
+<meta name="theme-color" content="#05070a">
 <link rel="stylesheet" href="/styles.css">
 <meta property="og:type" content="website">
 <meta property="og:title" content="${escape(options.title)}">
@@ -725,6 +727,14 @@ write("viewer.webmanifest", JSON.stringify({
     launch_type: "single-client",
   }],
 }));
+// The site-wide manifest: every page but the editor links it, so readm3.com installs from its homepage.
+write("manifest.webmanifest", JSON.stringify({
+  id: "/", name: "readm3", short_name: "readm3",
+  description: "Markdown editing and sharing for people and teams.",
+  start_url: "/", scope: "/", display: "standalone",
+  background_color: "#05070a", theme_color: "#05070a", lang: "en",
+  icons: [192, 512].flatMap((size) => ["any", "maskable"].map((purpose) => ({ src: `/viewer-assets/icon-${size}.png`, sizes: `${size}x${size}`, type: "image/png", purpose }))),
+}));
 const precache = ["/viewer", script, ...chunks, viewerCss, sharedCss, adminCss, seed, "/viewer.webmanifest", "/favicon.svg", "/viewer-assets/icon-192.png", "/viewer-assets/icon-512.png"];
 const cacheVersion = createHash("sha256").update(viewerHtml + precache.join("|")).digest("hex").slice(0, 16);
 write("viewer-sw.js", readFileSync(join(here, "assets/viewer-sw.js"), "utf8")
diff --git a/site/test/viewer.spec.ts b/site/test/viewer.spec.ts
index 20ce26c..24856cf 100644
--- a/site/test/viewer.spec.ts
+++ b/site/test/viewer.spec.ts
@@ -610,6 +610,20 @@ test("still renders a Markdown paste as a document", async ({ page, request }) =
   await expect(page.locator("#raw-link")).toBeVisible();
 });
 
+test("the homepage links an installable site manifest", async ({ request }) => {
+  expect(await (await request.get("/")).text()).toContain('<link rel="manifest" href="/manifest.webmanifest">');
+  const response = await request.get("/manifest.webmanifest");
+  expect(response.headers()["content-type"]).toContain("manifest+json");
+  const manifest = await response.json();
+  expect(manifest).toMatchObject({ name: "readm3", start_url: "/", scope: "/", display: "standalone" });
+  for (const size of ["192x192", "512x512"]) expect(manifest.icons.some((icon: { sizes: string }) => icon.sizes === size)).toBe(true);
+  for (const icon of manifest.icons) {
+    const image = await request.get(icon.src);
+    expect(image.ok()).toBe(true);
+    expect(image.headers()["content-type"]).toBe("image/png");
+  }
+});
+
 test("installs a complete offline shell and restores edited documents after an offline reload", async ({ page, context, request }) => {
   const manifestResponse = await request.get("/viewer.webmanifest");
   expect(manifestResponse.headers()["content-type"]).toContain("manifest+json");