diff --git a/templates/edit.html b/templates/edit.html
index a01a84b..d852709 100644
--- a/templates/edit.html
+++ b/templates/edit.html
@@ -8,6 +8,7 @@
         <meta property="og:description" content="View and edit the LaTeX/TikZ code for diagram {{ run_id }}." />
         <meta property="og:type" content="website" />
         <meta property="og:url" content="{{ base_path }}/d/{{ run_id }}" />
+        <meta property="og:image" content="{{ base_path }}/d/{{ run_id }}/preview.png" />
         <link rel="preconnect" href="https://fonts.googleapis.com" />
         <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
         <link