diff --git a/index.html b/index.html
index 474b86d..d9ca719 100644
--- a/index.html
+++ b/index.html
@@ -37,6 +37,9 @@
         }
         return false;
     }
+    function clearArea() {
+        document.getElementById('pem').value = "";
+    }
     function help() {
         document.getElementById('tree').innerHTML = "";
         document.getElementById('dump').innerHTML = "";
@@ -106,6 +109,7 @@
   <br/>
   <label title="can be slow with big files"><input type="checkbox" id="wantHex" checked="checked"> with hex dump</label>
   <input type="button" value="decode" onclick="decodeArea();">
+  <input type="button" value="clear" onclick="clearArea();">
   <input type="button" value="help" onclick="help();">
   <br/>
   <input type="file" id="file"><input type="button" value="load" onclick="load();">