diff --git a/js/webmentions.js b/js/webmentions.js
index 3e3bade..89f70c9 100644
--- a/js/webmentions.js
+++ b/js/webmentions.js
@@ -225,6 +225,25 @@
       const wmItems = [...(wmData1.children || []), ...(wmData2.children || [])];
       const convItems = [...(convData1.children || []), ...(convData2.children || [])];
 
+      // Collect syndication URLs from owner-enriched replies (is_owner items).
+      // When the owner replies from the frontend, Micropub creates the post
+      // and syndicates it (e.g., to Bluesky). The syndicated copy's URL
+      // (e.g., bsky.app/profile/.../post/...) is stored in the post's
+      // syndication property. Bridgy/webmention.io picks up that same URL
+      // and sends it back as a regular webmention. By collecting these
+      // syndication URLs, we can precisely match and suppress the echo
+      // without affecting direct platform replies that have no Micropub post.
+      var ownerReplySyndicationUrls = new Set();
+      for (var k = 0; k < convItems.length; k++) {
+        var c = convItems[k];
+        if (c.is_owner && c.syndication) {
+          var syns = Array.isArray(c.syndication) ? c.syndication : [c.syndication];
+          for (var s = 0; s < syns.length; s++) {
+            if (syns[s]) ownerReplySyndicationUrls.add(syns[s].replace(/\/$/, '').toLowerCase());
+          }
+        }
+      }
+
       // Build dedup sets from conversations items (richer metadata, take priority)
       const convUrls = new Set(convItems.map(c => c.url).filter(Boolean));
       const seen = new Set();
@@ -257,6 +276,21 @@
         const authorUrl = (wm.author && wm.author.url) || wm.url || '';
         const action = wm['wm-property'] || 'mention';
         if (authorUrl && authorActions.has(authorUrl + '::' + action)) continue;
+        // Skip webmention.io items that are syndicated echoes of owner replies.
+        // When the owner replies from the frontend, Micropub creates the post
+        // and syndicates it (e.g., to Bluesky at bsky.app/profile/.../post/xyz).
+        // The conversations API returns the reply as an is_owner enriched item
+        // with syndication: ["https://bsky.app/profile/.../post/xyz"].
+        // Bridgy/webmention.io also picks up that exact syndicated URL and
+        // sends it back as a regular webmention. By matching the webmention's
+        // source URL against known owner reply syndication URLs, we precisely
+        // filter the echo without affecting:
+        // - Direct platform replies (no Micropub post, no syndication URL match)
+        // - Owner likes/reposts from webmention.io
+        // - Owner replies on a different thread on the same page
+        if (wm.url && ownerReplySyndicationUrls.has(wm.url.replace(/\/$/, '').toLowerCase())) {
+          continue;
+        }
         seen.add(key);
         allChildren.push(wm);
       }