diff --git a/modules/random/random.php b/modules/random/random.php
index 00a5f40..49867dc 100644
--- a/modules/random/random.php
+++ b/modules/random/random.php
@@ -2,7 +2,7 @@
 
 $len = $_GET['length'] ?? 32;
 
-$contains = isset($_GET['contains']) ? explode(',', $_GET['contains']) : ['digit', 'upper', 'lower', 'special'];
+$contains = isset($_GET['contains']) ? explode(',', $_GET['contains']) : ['hex', 'digit', 'upper', 'lower', 'special'];
 
 header('Content-Type: text/plain');
 
diff --git a/modules/random/random_help.php b/modules/random/random_help.php
index 4923311..a2870d3 100644
--- a/modules/random/random_help.php
+++ b/modules/random/random_help.php
@@ -13,6 +13,10 @@ return [
     [
       'name' => 'Change length',
       'path' => '/?length=20'
+    ],
+    [
+      'name' => 'Only hex',
+      'path' => '/?length=16&contains=hex'
     ]
   ],
   'append' => function () {
diff --git a/utils.php b/utils.php
index ed66647..15a690f 100644
--- a/utils.php
+++ b/utils.php
@@ -5,7 +5,8 @@ function generateRandomString($length = 10, $contains = ['upper', 'lower', 'digi
      'digit' => '0123456789',
      'lower' => 'abcdefghijklmnopqrstuvwxyz',
      'upper' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
-     'special' => '!#$%&()*+,-.:;<=>?@[]'
+     'special' => '!#$%&()*+,-.:;<=>?@[]',
+     'hex' => '0123456789abcdef'
   ];
   $characters = '';
   foreach ($contains as $c) {