diff --git a/config-default.php b/config-default.php
index 787f8d1..c76c416 100755
--- a/config-default.php
+++ b/config-default.php
@@ -40,6 +40,7 @@ $keep_extensions = array('jpg', 'jpeg', 'png', 'gif'); //Files with one of this
 
 //ADVANCED SETTINGS
 $thumb_size = 320; // Thumbnail height/width (square thumbs). Changing this will most likely require manual altering of the template file to make it look properly!
+$thumb_size_limit = array(320, 160, 80); // Limit possible thumb size prevent space in server
 $label_max_length = 40; // Maximum chars of a folder name that will be displayed on the folder thumbnail
 $display_exif = 0; // Take care, even if not diplayed EXIF are still readable for visitors. May be a good idea to erase EXIF data...
 $display_filename = 0; // Show file names below the pictures
diff --git a/createthumb.php b/createthumb.php
index 402e03f..6f9e3da 100644
--- a/createthumb.php
+++ b/createthumb.php
@@ -9,10 +9,27 @@
 
 error_reporting(0);
 
+require "config-default.php";
+if(file_exists('config.php')){
+    include "config.php";  
+}
+
 $get_filename = $_GET['filename'];
 $get_size = @$_GET['size'];
 if (empty($get_size)) {
-	$get_size = 120;
+	$get_size = $thumb_size;
+}
+
+$options = array(
+    'options' => array(
+        'default' => $thumb_size,
+    )
+);
+
+$get_size = filter_var($get_size, FILTER_VALIDATE_INT, $options);
+
+if(!in_array($get_size, $thumb_size_limit)){
+	$get_size = $thumb_size;
 }
 
 if (preg_match("/^\/.*/i", $get_filename)) {
@@ -77,7 +94,7 @@ if (!is_dir('thumbs') && is_writable('.')) {
 
 // Thumbnail file name and path.
 // (We always put thumbnails in jpg for simplification)
-$thumbname = 'thumbs/' . sanitize($get_filename) . '.jpg';
+$thumbname = 'thumbs/' . sanitize($get_size.'_'.$get_filename) . '.jpg';
 
 if (file_exists($thumbname)) // If thumbnail exists, serve it.
 {