diff --git a/src/index.php b/src/index.php
index 98c4a54..0578744 100644
--- a/src/index.php
+++ b/src/index.php
@@ -85,7 +85,7 @@ function log() {
     <a id="logo" href="http://swagger.io">swagger</a>
     <form id='api_selector'>
       <div class='input'><input placeholder="http://example.com/api" id="input_baseUrl" name="baseUrl" type="text"/></div>
-      <div class='input'><input placeholder="api_key" id="input_apiKey" name="apiKey" type="text"/></div>
+      <div class='input'><input placeholder="api_key" id="input_apiKey" name="apiKey" type="password"/></div>
       <div class='input'><a id="explore" href="#" data-sw-translate>Explore</a></div>
     </form>
   </div>