diff --git a/og.png b/og.png
deleted file mode 100644
index 945b9b8..0000000
Binary files a/og.png and /dev/null differ
diff --git a/static/og.png b/static/og.png
new file mode 100644
index 0000000..743be9a
Binary files /dev/null and b/static/og.png differ
diff --git a/themes/openfreebooks/templates/base.html b/themes/openfreebooks/templates/base.html
index 0f57d1e..1bb18c5 100644
--- a/themes/openfreebooks/templates/base.html
+++ b/themes/openfreebooks/templates/base.html
@@ -7,6 +7,7 @@
     {% block meta_description %}
     <meta name="description" content="{{ config.description | default(value=config.extra.site_title) }}" />
     {% endblock meta_description %}
+    {% include "partials/social-meta.html" %}
 
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
diff --git a/themes/openfreebooks/templates/partials/social-meta.html b/themes/openfreebooks/templates/partials/social-meta.html
new file mode 100644
index 0000000..e01f4c5
--- /dev/null
+++ b/themes/openfreebooks/templates/partials/social-meta.html
@@ -0,0 +1,16 @@
+{# Open Graph + Twitter Card — shared site image on every page #}
+{% set og_image = get_url(path='og.png', trailing_slash=false) %}
+<meta property="og:type" content="website" />
+<meta property="og:site_name" content="{{ config.extra.site_title }}" />
+<meta property="og:title" content="{% if page %}{{ page.title }}{% elif section %}{{ section.title }}{% else %}{{ config.title }}{% endif %}" />
+<meta property="og:description" content="{% if page and page.description %}{{ page.description }}{% elif section and section.description %}{{ section.description }}{% else %}{{ config.description }}{% endif %}" />
+<meta property="og:url" content="{% if page %}{{ page.permalink }}{% elif section %}{{ section.permalink }}{% else %}{{ config.base_url }}{% endif %}" />
+<meta property="og:image" content="{{ og_image }}" />
+<meta property="og:image:width" content="1200" />
+<meta property="og:image:height" content="630" />
+<meta property="og:image:alt" content="{{ config.extra.site_title }} — free, open textbooks for every learner" />
+<meta name="twitter:card" content="summary_large_image" />
+<meta name="twitter:title" content="{% if page %}{{ page.title }}{% elif section %}{{ section.title }}{% else %}{{ config.title }}{% endif %}" />
+<meta name="twitter:description" content="{% if page and page.description %}{{ page.description }}{% elif section and section.description %}{{ section.description }}{% else %}{{ config.description }}{% endif %}" />
+<meta name="twitter:image" content="{{ og_image }}" />
+<meta name="twitter:image:alt" content="{{ config.extra.site_title }} — free, open textbooks for every learner" />