diff --git a/index.html b/index.html
index fb1fa24..5cb5c87 100644
--- a/index.html
+++ b/index.html
@@ -8,6 +8,10 @@
         />
         <meta name="theme-color" content="#1976d2" />
 
+        <!-- Favicon -->
+        <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+        <link rel="apple-touch-icon" href="/favicon.svg" />
+
         <!-- SEO Meta Tags -->
         <title>
             Worknot - Host Notion Sites on Your Custom Domain | Cloudflare
@@ -35,6 +39,13 @@
             content="Host your Notion Site on a custom domain with Cloudflare Workers. Actively maintained by Classmethod, always up-to-date with the latest Notion specifications."
         />
         <meta property="og:site_name" content="Worknot" />
+        <meta
+            property="og:image"
+            content="https://worknot.classmethod.live/og-image.svg"
+        />
+        <meta property="og:image:width" content="1200" />
+        <meta property="og:image:height" content="630" />
+        <meta property="og:locale" content="en_US" />
 
         <!-- Twitter -->
         <meta name="twitter:card" content="summary_large_image" />
@@ -47,10 +58,37 @@
             name="twitter:description"
             content="Host your Notion Site on a custom domain with Cloudflare Workers. Actively maintained by Classmethod, always up-to-date with the latest Notion specifications."
         />
+        <meta
+            name="twitter:image"
+            content="https://worknot.classmethod.live/og-image.svg"
+        />
 
         <!-- Canonical URL -->
         <link rel="canonical" href="https://worknot.classmethod.live/" />
 
+        <!-- Structured Data (JSON-LD) -->
+        <script type="application/ld+json">
+            {
+                "@context": "https://schema.org",
+                "@type": "WebApplication",
+                "name": "Worknot",
+                "description": "Host your Notion Site on a custom domain with Cloudflare Workers. Generate Worker scripts to proxy Notion pages with pretty URLs and image optimization.",
+                "url": "https://worknot.classmethod.live/",
+                "applicationCategory": "DeveloperApplication",
+                "operatingSystem": "Web",
+                "offers": {
+                    "@type": "Offer",
+                    "price": "0",
+                    "priceCurrency": "USD"
+                },
+                "creator": {
+                    "@type": "Organization",
+                    "name": "Classmethod",
+                    "url": "https://classmethod.jp/"
+                }
+            }
+        </script>
+
         <!-- Fonts -->
         <link rel="preconnect" href="https://fonts.googleapis.com" />
         <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
diff --git a/public/favicon.svg b/public/favicon.svg
new file mode 100644
index 0000000..2477514
--- /dev/null
+++ b/public/favicon.svg
@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
+  <rect width="100" height="100" rx="20" fill="#1976d2"/>
+  <text x="50" y="68" font-size="60" font-family="system-ui, sans-serif" font-weight="bold" text-anchor="middle" fill="white">W</text>
+</svg>
diff --git a/public/og-image.svg b/public/og-image.svg
new file mode 100644
index 0000000..14b17a1
--- /dev/null
+++ b/public/og-image.svg
@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="1200" height="630" viewBox="0 0 1200 630">
+  <defs>
+    <linearGradient id="bg" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" style="stop-color:#1976d2"/>
+      <stop offset="100%" style="stop-color:#1565c0"/>
+    </linearGradient>
+  </defs>
+  <rect width="1200" height="630" fill="url(#bg)"/>
+  <text x="100" y="280" font-size="72" font-family="system-ui, -apple-system, sans-serif" font-weight="bold" fill="white">Worknot</text>
+  <text x="100" y="360" font-size="36" font-family="system-ui, -apple-system, sans-serif" fill="white" opacity="0.9">Host Notion Sites on Your Custom Domain</text>
+  <text x="100" y="550" font-size="28" font-family="system-ui, -apple-system, sans-serif" fill="white" opacity="0.7">Powered by Cloudflare Workers</text>
+</svg>
diff --git a/public/robots.txt b/public/robots.txt
new file mode 100644
index 0000000..9e96137
--- /dev/null
+++ b/public/robots.txt
@@ -0,0 +1,4 @@
+User-agent: *
+Allow: /
+
+Sitemap: https://worknot.classmethod.live/sitemap.xml
diff --git a/public/sitemap.xml b/public/sitemap.xml
new file mode 100644
index 0000000..21f4dce
--- /dev/null
+++ b/public/sitemap.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+  <url>
+    <loc>https://worknot.classmethod.live/</loc>
+    <changefreq>weekly</changefreq>
+    <priority>1.0</priority>
+  </url>
+</urlset>