diff --git a/_includes/components/reply-context.njk b/_includes/components/reply-context.njk
index 782f393..644e87c 100644
--- a/_includes/components/reply-context.njk
+++ b/_includes/components/reply-context.njk
@@ -8,6 +8,7 @@
 {% set likedUrl = likeOf or like_of %}
 {% set repostedUrl = repostOf or repost_of %}
 {% set bookmarkedUrl = bookmarkOf or bookmark_of %}
+{% set youtubeVideoId = youtubeVideoId or (repostedUrl | youtubeId) or (likedUrl | youtubeId) or (bookmarkedUrl | youtubeId) or (replyTo | youtubeId) %}
 
 {% if replyTo or likedUrl or repostedUrl or bookmarkedUrl %}
 <aside class="reply-context mb-6" aria-label="Reply context">
diff --git a/eleventy.config.js b/eleventy.config.js
index 3bc9028..ee15438 100644
--- a/eleventy.config.js
+++ b/eleventy.config.js
@@ -966,6 +966,16 @@ export default function (eleventyConfig) {
     });
   });
 
+  eleventyConfig.addFilter("youtubeId", (url) => {
+    if (!url || typeof url !== "string") return null;
+    try {
+      const u = new URL(url);
+      if (u.hostname === "youtu.be") return u.pathname.slice(1).split("?")[0] || null;
+      if (u.hostname.endsWith("youtube.com")) return u.searchParams.get("v") || null;
+    } catch {}
+    return null;
+  });
+
   eleventyConfig.addFilter("stripTrailingSlash", (url) => {
     if (!url || typeof url !== "string") return url || "";
     return url.endsWith("/") ? url.slice(0, -1) : url;