diff --git a/web-demo/public/index.html b/web-demo/public/index.html
index fe9c513..40f7312 100644
--- a/web-demo/public/index.html
+++ b/web-demo/public/index.html
@@ -3,8 +3,33 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <meta name="description" content="Analyze XLSX workbooks locally with streaming Rust, WebAssembly, and provenance-ready RAG exports." />
     <title>MiniExcel Browser Lab</title>
+    <meta name="description" content="Analyze XLSX workbooks locally with streaming Rust, WebAssembly, and provenance-ready RAG exports." />
+    <link rel="canonical" href="https://mini-software.github.io/MiniExcel-Rust/" />
+    <meta name="robots" content="index, follow" />
+
+    <!-- Open Graph / Facebook -->
+    <meta property="og:type" content="website" />
+    <meta property="og:url" content="https://mini-software.github.io/MiniExcel-Rust/" />
+    <meta property="og:title" content="MiniExcel Browser Lab" />
+    <meta property="og:description" content="Analyze XLSX workbooks locally with streaming Rust, WebAssembly, and provenance-ready RAG exports." />
+    <meta property="og:image" content="https://mini-software.github.io/MiniExcel-Rust/og-image.png" />
+    <meta property="og:image:secure_url" content="https://mini-software.github.io/MiniExcel-Rust/og-image.png" />
+    <meta property="og:image:type" content="image/png" />
+    <meta property="og:image:width" content="1200" />
+    <meta property="og:image:height" content="630" />
+    <meta property="og:image:alt" content="MiniExcel Browser Lab interface showing local spreadsheet preview, analysis, and RAG export options" />
+    <meta property="og:site_name" content="MiniExcel" />
+    <meta property="og:locale" content="en_US" />
+
+    <!-- Twitter Card -->
+    <meta name="twitter:card" content="summary_large_image" />
+    <meta name="twitter:url" content="https://mini-software.github.io/MiniExcel-Rust/" />
+    <meta name="twitter:title" content="MiniExcel Browser Lab" />
+    <meta name="twitter:description" content="Analyze XLSX workbooks locally with streaming Rust, WebAssembly, and provenance-ready RAG exports." />
+    <meta name="twitter:image" content="https://mini-software.github.io/MiniExcel-Rust/og-image.png" />
+    <meta name="twitter:image:alt" content="MiniExcel Browser Lab interface showing local spreadsheet preview, analysis, and RAG export options" />
+
     <link rel="icon" href="data:," />
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
diff --git a/web-demo/public/og-image.png b/web-demo/public/og-image.png
new file mode 100644
index 0000000..9dcc55e
Binary files /dev/null and b/web-demo/public/og-image.png differ
