fix #2425

app/views/uploads/new.html.erb

@@ -7,6 +7,12 @@
         <p>Before uploading, please read the <%= link_to "how to upload guide", wiki_pages_path(:title => "howto:upload") %>.</p>
       </div>
 
+      <% if params[:url].blank? %>
+        <div id="bookmarklet-notice">
+          <p><span style="font-weight: bold;">You should be using Danbooru's official <%= link_to "upload bookmarklet", bookmarklet_path %> to upload!</span> It makes uploading more convenient and does several things for you automatically such as fixing incorrect sources and optionally copying the artist's commentary.</p>
+        </div>
+      <% end %>
+
       <%= render "image" %>
       <%= render "post", :post => @post %>
       <%= render "sources/info", :source => @source %>