diff --git image_captcha/image_captcha-rtl.css image_captcha/image_captcha-rtl.css
new file mode 100644
index 0000000..e243e03
--- /dev/null
+++ image_captcha/image_captcha-rtl.css
@@ -0,0 +1,14 @@
+/* $Id$ */
+
+/**
+ * Styling of the font selection list (with previews)
+ * on the Image CAPTCHA settings page.
+ */
+
+/**
+ * Float the fonts with preview (with a fixed width)
+ * to create a multi-column layout.
+ */
+.image_captcha_admin_font_preview {
+  float: right;
+}
diff --git image_captcha/image_captcha.admin.inc image_captcha/image_captcha.admin.inc
index d15714e..d746367 100644
--- image_captcha/image_captcha.admin.inc
+++ image_captcha/image_captcha.admin.inc
@@ -59,6 +59,15 @@ function image_captcha_settings_form() {
     '#default_value' => (int) variable_get('image_captcha_code_length', 5),
     '#description' => t('The code length influences the size of the image. Note that larger values make the image generation more CPU intensive.'),
   );
+  $langs = language_list('direction');
+  if ($langs[1]) {
+    $form['image_captcha_code_settings']['image_captcha_direction'] = array(
+      '#type' => 'checkbox',
+      '#title' => t('RTL direction for RTL languages'),
+      '#default_value' => variable_get('image_captcha_direction', 0),
+      '#description' => t('This option will cause characters in captcha image to start from the right if the current language is RTL.'),
+    );
+  }
 
   // Font related stuff.
   $form['image_captcha_font_settings'] = _image_captcha_settings_form_font_section();
diff --git image_captcha/image_captcha.user.inc image_captcha/image_captcha.user.inc
index 2a9a8e5..18f599e 100644
--- image_captcha/image_captcha.user.inc
+++ image_captcha/image_captcha.user.inc
@@ -254,6 +254,10 @@ function _image_captcha_image_generator_print_string(&$image, $width, $height, $
   $ccage_width = $width / $character_quantity;
   $ccage_height = $height;
 
+  global $language;
+  if ($language->direction && ((bool) variable_get('image_captcha_direction', 0))) {
+    $characters = array_reverse($characters);
+  }
   foreach ($characters as $c => $character) {
     // initial position of character: in the center of its cage
     $center_x = ($c + 0.5) * $ccage_width;