diff --git a/c3l_membership/views.py b/c3l_membership/views.py
--- a/c3l_membership/views.py
+++ b/c3l_membership/views.py
@@ -129,9 +129,13 @@ def index():
             xml=xml_template.format(**xml_data),
             minor_member=minor_member,
         )
-        return render_pdf(
-            HTML(string=html),
-            download_filename=f"C3L_Membership_{form.username.data}.pdf",
-        )
+
+        if current_app.debug:
+            return render_pdf(HTML(string=html))
+        else:
+            return render_pdf(
+                HTML(string=html),
+                download_filename=f"C3L_Membership_{form.username.data}.pdf",
+            )
 
     return render_template("index.html", form=form, crypto_error=False)