diff --git a/index.php b/index.php
index 5e277c1..a6b3f71 100644
--- a/index.php
+++ b/index.php
@@ -71,7 +71,7 @@
 	exit();
 }
 
-$allowedExtensions = ['jpg', 'jpeg', 'png', 'gif', 'webp'];
+$allowedExtensions = ['jpg', 'jpeg', 'png', 'gif', 'webp', 'css', 'js'];
 
 if(!in_array(strtolower($sourceExt), $allowedExtensions) || !in_array(strtolower($targetExt), $allowedExtensions)) {
     debug("\t Extension not allowed: $sourceExt", $debugMode);