diff --git a/plotly/io/_html.py b/plotly/io/_html.py
index a9ff68c23e..b7a3e22901 100644
--- a/plotly/io/_html.py
+++ b/plotly/io/_html.py
@@ -340,7 +340,7 @@ def to_html(
     if full_html:
         return """\
 <html>
-<head><meta charset="utf-8" /></head>
+<head><meta charset="utf-8" /><meta name="referrer" content="no-referrer-when-downgrade" /></head>
 <body>
     {div}
 </body>
