diff --git a/config/install/recaptcha.settings.yml b/config/install/recaptcha.settings.yml
index 00ec248..6c7165d 100644
--- a/config/install/recaptcha.settings.yml
+++ b/config/install/recaptcha.settings.yml
@@ -4,5 +4,6 @@ widget:
   theme: 'light'
   type: 'image'
   size: ''
+  badge: 'bottomright'
   tabindex: 0
   noscript: false
diff --git a/config/schema/recaptcha.schema.yml b/config/schema/recaptcha.schema.yml
index dd90863..866c02f 100644
--- a/config/schema/recaptcha.schema.yml
+++ b/config/schema/recaptcha.schema.yml
@@ -23,6 +23,9 @@ recaptcha.settings:
         size:
           type: string
           label: 'Size'
+        badge:
+          type: string
+          label: 'Badge'
         tabindex:
           type: integer
           label: 'Tabindex'
diff --git a/js/recaptcha.invisible.js b/js/recaptcha.invisible.js
new file mode 100644
index 0000000..d9bd24d
--- /dev/null
+++ b/js/recaptcha.invisible.js
@@ -0,0 +1,87 @@
+/**
+ * @file
+ * Invisible reCaptcha behaviors.
+ */
+/**
+ * The submit object that was clicked.
+ *
+ * @type {object}
+ */
+var clickedSubmit = '';
+var clickedSubmitEvent = '';
+
+/**
+ * reCaptcha data-callback that submits the form.
+ *
+ * @param token
+ *   The validation token.
+ */
+function recapthcaOnInvisibleSubmit(token) {
+  jQuery(clickedSubmit).trigger(clickedSubmitEvent);
+  clickedSubmit = '';
+}
+
+(function ($, Drupal) {
+  /**
+   * Handles the submission of the form with the invisible reCaptcha.
+   *
+   * @type {Drupal~behavior}
+   *
+   * @prop {Drupal~behaviorAttach} attach
+   *   Attaches the behavior for the invisible reCaptcha.
+   */
+  Drupal.behaviors.invisibleRecaptcha = {
+    attach: function (context) {
+      if (Drupal.hasOwnProperty('Ajax')) {
+        Drupal.Ajax.prototype.beforeSubmit = function (form_values, element, options) {
+          if ($(this.element).is(clickedSubmit) && grecaptcha.getResponse().length === 0) {
+            options.needsRevalidate = true;
+          }
+          else if ($(this.element).is(clickedSubmit) && grecaptcha.getResponse().length !== 0) {
+            this.progress.type = 'none';
+          }
+        };
+        $(document).ajaxSend(function( event, jqxhr, settings ) {
+          if (settings.needsRevalidate) {
+            jqxhr.abort();
+          }
+        });
+      }
+      $('form', context).each(function () {
+        var $form = $(this);
+        if ($form.find('.g-recaptcha[data-size="invisible"]').length) {
+          $form.find(':submit').on({
+            mousedown: function ( e ) {
+              preventFormSubmit(e, this);
+              $(this).trigger('click');
+            },
+            click: function ( e ) {
+              preventFormSubmit(e, this);
+            }
+          });
+        }
+      });
+      function preventFormSubmit(event, elem) {
+        if (clickedSubmit.length === 0) {
+          // We need validate form, to avoid prevention of html5 validation.
+          if ($(elem).closest('form')[0].checkValidity()) {
+            event.preventDefault();
+            event.stopPropagation();
+            clickedSubmitEvent = event.type;
+            validateInvisibleCaptcha(elem);
+          }
+        }
+      }
+      /**
+       * Triggers the reCaptcha to validate the form.
+       *
+       * @param {object} button
+       *   The submit button object was clicked.
+       */
+      function validateInvisibleCaptcha(button) {
+        clickedSubmit = button;
+        grecaptcha.execute();
+      }
+    }
+  }
+})(jQuery, Drupal);
diff --git a/recaptcha.libraries.yml b/recaptcha.libraries.yml
new file mode 100644
index 0000000..6ecef6d
--- /dev/null
+++ b/recaptcha.libraries.yml
@@ -0,0 +1,7 @@
+recaptcha.invisible:
+  version: VERSION
+  js:
+    js/recaptcha.invisible.js: {}
+  dependencies:
+    - core/jquery
+    - core/drupal
\ No newline at end of file
diff --git a/recaptcha.module b/recaptcha.module
index 674fa36..f05d7c1 100644
--- a/recaptcha.module
+++ b/recaptcha.module
@@ -102,6 +102,14 @@ function recaptcha_captcha($op, $captcha_type = '') {
             'data-size' => $config->get('widget.size'),
             'data-tabindex' => $config->get('widget.tabindex'),
           ];
+
+          // Set the callback for invisible captcha.
+          if ('invisible' === $config->get('widget.size')) {
+            $attributes['data-badge'] = $config->get('widget.badge');
+            $attributes['data-callback'] = 'recapthcaOnInvisibleSubmit';
+            $captcha['form']['#attached']['library'][] = 'recaptcha/recaptcha.invisible';
+          }
+
           // Filter out empty tabindex/size.
           $attributes = array_filter($attributes);
 
diff --git a/src/Form/ReCaptchaAdminSettingsForm.php b/src/Form/ReCaptchaAdminSettingsForm.php
index fd2ca6d..8a7013d 100644
--- a/src/Form/ReCaptchaAdminSettingsForm.php
+++ b/src/Form/ReCaptchaAdminSettingsForm.php
@@ -87,10 +87,27 @@ class ReCaptchaAdminSettingsForm extends ConfigFormBase {
       '#options' => [
         '' => $this->t('Normal (default)'),
         'compact' => $this->t('Compact'),
+        'invisible' => $this->t('Invisible'),
       ],
       '#title' => $this->t('Size'),
       '#type' => 'select',
     ];
+    $form['widget']['recaptcha_badge'] = [
+      '#default_value' => $config->get('widget.badge'),
+      '#description' => $this->t('Reposition the reCAPTCHA badge. "Inline" allows you to control the CSS.'),
+      '#options' => [
+        'bottomright' => $this->t('Bottom Right (default)'),
+        'bottomleft' => $this->t('Bottom Left'),
+        'inline' => $this->t('Inline'),
+      ],
+      '#title' => $this->t('Badge'),
+      '#type' => 'select',
+      '#states' => array(
+        'visible' => array(
+          ':input[name="recaptcha_size"]' => array('value' => 'invisible'),
+        ),
+      ),
+    ];
     $form['widget']['recaptcha_tabindex'] = [
       '#default_value' => $config->get('widget.tabindex'),
       '#description' => $this->t('Set the <a href=":tabindex">tabindex</a> of the widget and challenge (Default = 0). If other elements in your page use tabindex, it should be set to make user navigation easier.', [':tabindex' => Url::fromUri('http://www.w3.org/TR/html4/interact/forms.html', ['fragment' => 'adef-tabindex'])->toString()]),
@@ -120,6 +137,7 @@ class ReCaptchaAdminSettingsForm extends ConfigFormBase {
       ->set('widget.theme', $form_state->getValue('recaptcha_theme'))
       ->set('widget.type', $form_state->getValue('recaptcha_type'))
       ->set('widget.size', $form_state->getValue('recaptcha_size'))
+      ->set('widget.badge', $form_state->getValue('recaptcha_badge'))
       ->set('widget.tabindex', $form_state->getValue('recaptcha_tabindex'))
       ->set('widget.noscript', $form_state->getValue('recaptcha_noscript'))
       ->save();