diff --git a/press.config.tsx b/press.config.tsx
index 73df00b06..9734315bd 100644
--- a/press.config.tsx
+++ b/press.config.tsx
@@ -1,6 +1,7 @@
 import { defineMintlifyI18n, mintlifyPlugin, readMintlifyDocs } from "@fumapress/mintlify";
 import { defineConfig } from "fumapress";
 import { fumadocsMdx } from "fumapress/adapters/mdx";
+import { flexsearchPlugin } from "fumapress/plugins/flexsearch";
 import { openapiPlugin } from "fumapress/plugins/openapi";
 import { robotsPlugin } from "fumapress/plugins/robots";
 import { update } from "fumadocs-core/source";
@@ -145,6 +146,38 @@ export default defineConfig({
   // One registration is intentional: its adapter and loader plugin handle all
   // OpenAPI virtual pages, regardless of which content source generated them.
   .plugins(
+    flexsearchPlugin({
+      async buildIndex(page) {
+        const title = page.data.title ?? page.path;
+        const description = page.data.description;
+        const sourceStructuredData = typeof page.data.structuredData === "function"
+          ? await page.data.structuredData()
+          : page.data.structuredData;
+        // FlexSearch's static serialization expands multilingual documents
+        // considerably. Index titles, descriptions, a few headings, and the
+        // opening content so search remains useful without exceeding Pages'
+        // hard 25 MiB per-file limit. OpenAPI endpoints intentionally omit the
+        // schema body, which is duplicated across every generated operation.
+        const isOpenAPI = page.url.includes("/api-reference/");
+        const headings = isOpenAPI
+          ? []
+          : sourceStructuredData.headings.slice(0, 4).map((heading) => ({
+              ...heading,
+              content: heading.content.slice(0, 100),
+            }));
+        const openingContent = isOpenAPI
+          ? []
+          : sourceStructuredData.contents.slice(0, 2).map((content) => content.content.slice(0, 300));
+        const structuredData = {
+          headings,
+          contents: [{
+            heading: undefined,
+            content: [title, description, ...openingContent, page.url].filter(Boolean).join(" "),
+          }],
+        };
+        return { id: page.url, title, description, url: page.url, structuredData };
+      },
+    }),
     mintlifyPlugin({ features: { navbar: false } }),
     openapiPlugin({ server: enOpenAPI }),
     robotsPlugin({
diff --git a/tests/fumapress-static-build.test.mjs b/tests/fumapress-static-build.test.mjs
index 393454fd4..4815b8da8 100644
--- a/tests/fumapress-static-build.test.mjs
+++ b/tests/fumapress-static-build.test.mjs
@@ -1,5 +1,5 @@
 import assert from "node:assert/strict";
-import { access, readdir, readFile } from "node:fs/promises";
+import { access, readdir, readFile, stat } from "node:fs/promises";
 import path from "node:path";
 import test from "node:test";
 import { collectMdxDocuments } from "../scripts/prepare-fumapress.mjs";
@@ -229,3 +229,9 @@ test("generated pages contain no internal .html route links", async () => {
   }
   assert.deepEqual(offenders, []);
 });
+
+
+test("static search stays within Cloudflare Pages' 25 MiB file limit", async () => {
+  const search = await stat(path.join(publicRoot, "api/search"));
+  assert.ok(search.size <= 25 * 1024 * 1024, `search artifact is ${search.size} bytes`);
+});