diff --git a/rhodecode/public/js/src/rhodecode.js b/rhodecode/public/js/src/rhodecode.js
--- a/rhodecode/public/js/src/rhodecode.js
+++ b/rhodecode/public/js/src/rhodecode.js
@@ -295,7 +295,12 @@ var tooltipActivate = function () {
                         instance.content(data);
                     })
                 } else {
-                    var data = '<div style="white-space: pre-wrap">{0}</div>'.format($origin.data('hovercardAlt'))
+                    if ($origin.data('hovercardAltHtml')) {
+                        var data =  atob($origin.data('hovercardAltHtml'));
+                    } else {
+                        var data = '<div style="white-space: pre-wrap">{0}</div>'.format($origin.data('hovercardAlt'))
+                    }
+
                     instance.content(data);
                 }
 
diff --git a/rhodecode/templates/base/base.mako b/rhodecode/templates/base/base.mako
--- a/rhodecode/templates/base/base.mako
+++ b/rhodecode/templates/base/base.mako
@@ -1,4 +1,13 @@
 ## -*- coding: utf-8 -*-
+
+## base64 filter
+<%!
+    def base64(text):
+        import base64
+        from rhodecode.lib.helpers import safe_str
+        return base64.encodestring(safe_str(text))
+%>
+
 <%inherit file="root.mako"/>
 
 <%include file="/ejs_templates/templates.html"/>