diff --git a/backend/app/downloads/og.py b/backend/app/downloads/og.py
index a28ee99..f1bcdc9 100644
--- a/backend/app/downloads/og.py
+++ b/backend/app/downloads/og.py
@@ -73,6 +73,12 @@ def _watch_tags(token: str, db: Session) -> str | None:
     if image:
         # A real thumbnail → a large image card; without one, a plain (text) card is served.
         tags.append(_tag("og:image", image))
+        # Facebook's scraper is pickier than Apple's on-device unfurl: spell out that the image is a
+        # public HTTPS JPEG so it renders the card even when it won't fetch/sniff the bytes itself.
+        if image.startswith("https://"):
+            tags.append(_tag("og:image:secure_url", image))
+        if image.endswith("poster.jpg"):
+            tags.append(_tag("og:image:type", "image/jpeg"))
         tags.append(_tag("twitter:card", "summary_large_image", attr="name"))
         tags.append(_tag("twitter:image", image, attr="name"))
     else: