diff --git a/website/src/_layouts/base.njk b/website/src/_layouts/base.njk
index 690716f..2a93300 100644
--- a/website/src/_layouts/base.njk
+++ b/website/src/_layouts/base.njk
@@ -5,6 +5,19 @@
   <title>{{ title or "KST4Contest" }}</title>
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <meta name="description" content="{{ description or 'KST4Contest is a contest-optimized ON4KST chat client for VHF, UHF and SHF ham radio contests.' }}">
+
+  <link rel="canonical" href="https://kst4contest.hamradioonline.de{{ page.url }}">
+
+  <meta property="og:type" content="website">
+  <meta property="og:title" content="{{ title or 'KST4Contest' }}">
+  <meta property="og:description" content="{{ description or 'Contest-optimized ON4KST chat client for VHF, UHF and SHF ham radio contests.' }}">
+  <meta property="og:url" content="https://kst4contest.hamradioonline.de{{ page.url }}">
+  <meta property="og:site_name" content="KST4Contest">
+
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:title" content="{{ title or 'KST4Contest' }}">
+  <meta name="twitter:description" content="{{ description or 'Contest-optimized ON4KST chat client for VHF, UHF and SHF ham radio contests.' }}">
+
   <link rel="stylesheet" href="/assets/css/main.css">
 </head>
 <body>
diff --git a/website/src/index.njk b/website/src/index.njk
index 10a3cc8..a779832 100644
--- a/website/src/index.njk
+++ b/website/src/index.njk
@@ -36,4 +36,22 @@ description: KST4Contest is a modern ON4KST chat client built for VHF, UHF and S
       <p>Windows, Linux and macOS builds are published through GitHub releases.</p>
     </div>
   </div>
-</section>
\ No newline at end of file
+</section>
+
+<script type="application/ld+json">
+{
+  "@context": "https://schema.org",
+  "@type": "SoftwareApplication",
+  "name": "KST4Contest",
+  "applicationCategory": "CommunicationApplication",
+  "operatingSystem": "Windows, macOS, Linux",
+  "description": "KST4Contest is a contest-optimized ON4KST chat client for VHF, UHF and SHF ham radio contests.",
+  "url": "https://kst4contest.hamradioonline.de/",
+  "downloadUrl": "https://github.com/praktimarc/kst4contest/releases",
+  "softwareVersion": "latest",
+  "author": {
+    "@type": "Person",
+    "name": "Praktimarc"
+  }
+}
+</script>
\ No newline at end of file
diff --git a/website/src/robots.txt b/website/src/robots.txt
new file mode 100644
index 0000000..433e07c
--- /dev/null
+++ b/website/src/robots.txt
@@ -0,0 +1,4 @@
+User-agent: *
+Allow: /
+
+Sitemap: https://kst4contest.hamradioonline.de/sitemap.xml
\ No newline at end of file
diff --git a/website/src/sitemap.njk b/website/src/sitemap.njk
new file mode 100644
index 0000000..d32f24a
--- /dev/null
+++ b/website/src/sitemap.njk
@@ -0,0 +1,14 @@
+---
+permalink: /sitemap.xml
+eleventyExcludeFromCollections: true
+---
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+{%- for page in collections.all %}
+  {%- if page.url and not page.data.eleventyExcludeFromCollections %}
+  <url>
+    <loc>https://kst4contest.hamradioonline.de{{ page.url }}</loc>
+  </url>
+  {%- endif %}
+{%- endfor %}
+</urlset>
\ No newline at end of file
