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diff --git a/scripts/screenshots.mjs b/scripts/screenshots.mjs
new file mode 100644
index 0000000..1ce29b6
--- /dev/null
+++ b/scripts/screenshots.mjs
@@ -0,0 +1,229 @@
+/* global window, document */
+// Makes the window pictures of the README and the site (docs/images/lucid-light.png, lucid-dark.png, diagram-builder.png,
+// diagram-builder-dark.png, block-numbers.png) with the real app: a library of three pages, the first with a diagram and some
+// history, the diagram builder half way through a diagram, and block 4 opened in the margin.
+//
+//   pnpm build && node scripts/screenshots.mjs
+//
+// The page is captured without the window's frame (the operating system does not let a program photograph another window
+// without a permission), and on a Mac the window has no title bar of its own: the three round buttons sit at the top left of
+// the page, so they are drawn at the place where the real ones are (electron/chrome.ts), and nowhere else is touched.
+import { mkdtempSync, writeFileSync } from "node:fs";
+import { createRequire } from "node:module";
+import { tmpdir } from "node:os";
+import { dirname, join } from "node:path";
+import { fileURLToPath, pathToFileURL } from "node:url";
+
+const root = join(dirname(fileURLToPath(import.meta.url)), "..");
+const out = join(root, "docs/images");
+const require = createRequire(join(root, "apps/desktop/package.json"));
+const { _electron: electron } = require("@playwright/test");
+const { build } = createRequire(join(root, "packages/mcp/package.json"))("esbuild");
+
+// The note text is turned into blocks by the same parser the app uses.
+const work = mkdtempSync(join(tmpdir(), "lucid-shots-"));
+await build({
+  entryPoints: [join(root, "packages/kit/src/index.ts")],
+  bundle: true,
+  format: "esm",
+  platform: "node",
+  outfile: join(work, "kit.mjs"),
+  logLevel: "error",
+});
+const { parseLmd } = await import(pathToFileURL(join(work, "kit.mjs")).href);
+
+const note = `## Start simple
+One server runs the web app and the database. It works until traffic grows, then the tiers are **split** and each one scales on its own.
+
+## The request flow
+\`\`\`graph type=flowchart dir=TB title="Request flow at about a million users"
+browser [client]: Browser
+lb [loadbalancer]: Load balancer
+order [service]: Order service
+redis [cache]: Redis
+pg [datastore]: PostgreSQL
+kafka [queue]: Kafka
+browser -> lb: API calls
+lb -> order
+order -> redis: read
+order -> pg: cache miss
+order -> kafka: order placed
+\`\`\`
+
+## The database
+- PostgreSQL {chosen}
+- MongoDB {struck}
+`;
+const parsed = parseLmd(note);
+if (!parsed.ok) throw new Error(JSON.stringify(parsed.errors));
+const ids = parsed.blocks.map((b) => b.id);
+
+// "Just now": the entries are made at the moment the pictures are.
+const at = (seconds) => new Date(Date.now() + seconds * 1000).toISOString();
+const transcripts = [
+  {
+    id: "t-1",
+    text: "The browser sends API calls to a load balancer, which forwards them to the order service. The order service reads from Redis, queries PostgreSQL on a cache miss and publishes an event to Kafka when an order is placed.",
+    source: "wispr",
+    mode: "input",
+    createdAt: at(-20),
+    status: "applied",
+  },
+  {
+    id: "t-2",
+    text: "cross out MongoDB, we are choosing PostgreSQL",
+    source: "wispr",
+    mode: "command",
+    createdAt: at(-10),
+    status: "applied",
+  },
+];
+// The two list items the second change touched, and the way back for it (what Revert uses).
+const touched = parsed.blocks.slice(-2);
+const normal = (block) => {
+  const { status, ...props } = block.props;
+  void status;
+  return { ...block, props };
+};
+const changeLog = [
+  {
+    id: "c-1",
+    at: at(-20),
+    summary: "Added a diagram",
+    source: "lucid",
+    affected: [ids[3] ?? "x"],
+    reverted: false,
+  },
+  {
+    id: "c-2",
+    at: at(-10),
+    summary: "Crossed out MongoDB; marked PostgreSQL chosen",
+    source: "lucid",
+    affected: touched.map((b) => b.id),
+    reverted: false,
+    revert: {
+      undo: { steps: touched.map((b) => ({ kind: "update", id: b.id, block: normal(b) })) },
+      expect: Object.fromEntries(touched.map((b) => [b.id, b])),
+    },
+  },
+];
+
+const app = await electron.launch({
+  args: [join(root, "apps/desktop/out/main/index.js")],
+  env: {
+    ...process.env,
+    LUCID_HOME: mkdtempSync(join(tmpdir(), "lucid-home-")),
+    LUCID_PDF_WARMUP: "0",
+  },
+});
+try {
+  const page = await app.firstWindow();
+  await app.evaluate(({ BrowserWindow, screen }) => {
+    const win = BrowserWindow.getAllWindows()[0];
+    win.setBounds(screen.getPrimaryDisplay().workArea);
+    win.maximize();
+    win.show();
+  });
+  await page.emulateMedia({ colorScheme: "light" });
+  await page.waitForTimeout(1500);
+
+  // Three pages; the newest is the one that is open.
+  await page.evaluate(
+    async ({ blocks, transcripts, changeLog }) => {
+      await window.lucid.pages.create("Raft consensus", { format: "concept-note" });
+      await window.lucid.pages.create("Designing a URL shortener", { format: "system-design" });
+      const file = await window.lucid.pages.create("Scaling from 0 to a million users");
+      await window.lucid.pages.save({ ...file, doc: { blocks }, transcripts, changeLog });
+    },
+    { blocks: parsed.blocks, transcripts, changeLog },
+  );
+  await page.reload();
+  await page
+    .getByRole("navigation", { name: "Pages" })
+    .getByRole("button", { name: /Scaling/ })
+    .click();
+  await page.locator(".page-editor svg g.node").first().waitFor({ timeout: 20_000 });
+  await page.waitForTimeout(800);
+
+  /** The window as it is, with the three round buttons where the real ones sit on a Mac. */
+  const shoot = async () => {
+    // Not hovering anything, so no row shows its delete button.
+    await page.evaluate(() => {
+      document.activeElement?.blur();
+    });
+    await page.mouse.move(900, 1090);
+    await page.waitForTimeout(250);
+    await page.evaluate(() => {
+      const bar = document.querySelector(".topbar")?.getBoundingClientRect().height ?? 56;
+      ["#ff5f57", "#febc2e", "#28c840"].forEach((color, i) => {
+        const dot = document.createElement("div");
+        dot.className = "traffic-light-mark";
+        dot.style.cssText = `position:fixed;left:${String(20 + i * 20)}px;top:${String(Math.round((bar - 12) / 2))}px;width:12px;height:12px;border-radius:50%;background:${color};z-index:99999;pointer-events:none`;
+        document.body.appendChild(dot);
+      });
+    });
+    const png = await page.screenshot();
+    await page.evaluate(() => {
+      document.querySelectorAll(".traffic-light-mark").forEach((e) => {
+        e.remove();
+      });
+    });
+    return png;
+  };
+  const resized = async (png, name) => {
+    // The window is as big as the screen, at the screen's density: bring every picture to 1800 pixels wide.
+    const data = await app.evaluate(({ nativeImage }, base64) => {
+      const image = nativeImage.createFromBuffer(Buffer.from(base64, "base64"));
+      const size = image.getSize();
+      return image
+        .resize({
+          width: 1800,
+          height: Math.round((1800 * size.height) / size.width),
+          quality: "best",
+        })
+        .toPNG()
+        .toString("base64");
+    }, png.toString("base64"));
+    writeFileSync(join(out, name), Buffer.from(data, "base64"));
+    console.log(name);
+  };
+
+  for (const scheme of ["light", "dark"]) {
+    await page.emulateMedia({ colorScheme: scheme });
+    await page.waitForTimeout(600);
+    await resized(await shoot(), scheme === "light" ? "lucid-light.png" : "lucid-dark.png");
+
+    // The diagram builder, half way through a diagram.
+    const bar = page.getByLabel("Dictate or type your notes");
+    await bar.focus();
+    await page.keyboard.press("Meta+4");
+    await bar.fill(
+      "add keywords: browser, CDN, load balancer, order service, Redis, PostgreSQL, Kafka",
+    );
+    await bar.press("Enter");
+    await bar.fill("connections");
+    await bar.press("Enter");
+    for (const line of ["1 to 2", "1 to 3", "3 to 4", "4 to 5", "4 to 6", "4 to 7"]) {
+      await bar.fill(line);
+      await bar.press("Enter");
+    }
+    await page.locator(".wb-svg svg g.node").first().waitFor({ timeout: 20_000 });
+    await page.waitForTimeout(1200);
+    await resized(
+      await shoot(),
+      scheme === "light" ? "diagram-builder.png" : "diagram-builder-dark.png",
+    );
+    await page.getByRole("button", { name: "Cancel" }).click();
+    await page.waitForTimeout(500);
+    if (scheme === "light") {
+      // Block 4 opened in the margin.
+      await page.locator(".block-no").nth(3).click();
+      await page.waitForTimeout(600);
+      await resized(await shoot(), "block-numbers.png");
+      await page.keyboard.press("Escape");
+      await page.waitForTimeout(300);
+    }
+  }
+} finally {
+  await app.close();
+}