Index: src/views/partials/post-card.ejs
===================================================================
--- src/views/partials/post-card.ejs	(revision b607d4dd94335c25d91a4e8986c68fccd00e0a9e)
+++ src/views/partials/post-card.ejs	(revision 93b147d67da01570400474044f1ff3c35aeb6592)
@@ -49,5 +49,8 @@
        <% if (_ext) { %>target="_blank" rel="noopener"<% } else { %>hx-get="<%= _href %>?partial=1" hx-target="#pcms-main" hx-swap="innerHTML" hx-push-url="<%= _href %>" hx-indicator="#pcms-loading"<% } %>
        aria-label="<%= post.title || '(zonder titel)' %>" tabindex="-1">
-      <img src="<%= thumb(post.cover_image_url, 256) %>" alt="" loading="lazy" decoding="async">
+      <img src="<%= thumb(post.cover_image_url, 480) %>"
+           srcset="<%= thumb(post.cover_image_url, 320) %> 320w, <%= thumb(post.cover_image_url, 640) %> 640w, <%= thumb(post.cover_image_url, 1280) %> 1280w"
+           sizes="(min-width: 768px) 120px, 100vw"
+           alt="" loading="lazy" decoding="async">
       <% if (post.nsfw) { %><span class="nsfw-veil"><span class="nsfw-veil-label">🔞 <%= post.content_warning || t('post.nsfw_warning') %></span><span class="nsfw-veil-btn"><%= t('post.nsfw_show') %></span></span><% } %>
     </a>