diff --git a/graph-editor.js b/graph-editor.js
index f4ae666..0135e8e 100644
--- a/graph-editor.js
+++ b/graph-editor.js
@@ -365,8 +365,14 @@ window.onload = function()
 
     function updateSvgDownloadLink() {
       var rawSvg = new XMLSerializer().serializeToString(d3.select("#canvas svg" ).node());
-      d3.select("#downloadSvgButton").attr('href', "data:image/svg+xml;base64," + btoa( rawSvg ));
+      d3.select("#downloadSvgButton").attr('href', "data:image/svg+xml;base64," + btoa( b64EncodeUnicode(rawSvg) ));
     }
+    function b64EncodeUnicode (str) {
+        return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g,
+          function toSolidBytes (match, p1) {
+            return String.fromCharCode('0x' + p1)
+          }))
+      }
 
     var openConsoleWithCypher = function (evt)
     {