diff --git a/scripts/materialize-controller-assets.mjs b/scripts/materialize-controller-assets.mjs
new file mode 100644
index 0000000..6c2fa7d
--- /dev/null
+++ b/scripts/materialize-controller-assets.mjs
@@ -0,0 +1,19 @@
+import { mkdir, writeFile } from 'node:fs/promises';
+import topHudData from '../src/assets/controller/top-hud.js';
+import helmData from '../src/assets/controller/helm-action.js';
+import cannonBase64 from '../src/assets/controller/cannon-roundel.js';
+
+const outDir = new URL('../public/assets/controller/', import.meta.url);
+await mkdir(outDir, { recursive: true });
+
+const writeDataUrl = async (name, dataUrl) => {
+  const match = /^data:[^;]+;base64,(.+)$/.exec(dataUrl);
+  if (!match) throw new Error(`Invalid data URL for ${name}`);
+  await writeFile(new URL(name, outDir), Buffer.from(match[1], 'base64'));
+};
+
+await writeDataUrl('top-hud.webp', topHudData);
+await writeDataUrl('helm-sheet.webp', helmData);
+await writeFile(new URL('cannon-roundel.jpg', outDir), Buffer.from(cannonBase64, 'base64'));
+
+console.log('Materialized controller assets');