diff --git a/header.php b/header.php
index 394405c..da91fa7 100644
--- a/header.php
+++ b/header.php
@@ -5,7 +5,7 @@ require_once( dirname(__FILE__).'/includes/load-yourls.php' );
 
 // Ask for Infinity Squared settings
 include( dirname(__FILE__).'/public/config.php' );
-class ISQ { public static $general = array(), $links = array(), $social = array(); }
+class ISQ { public static $general = array(), $links = array(), $social = array(), $recaptcha = array(); }
 
 // Load translations
 function isq_load_textdomain() {
@@ -27,6 +27,9 @@ if ( $message = $url. yourls__( 'added to database', 'isq_translation') ) {
 	} elseif ( $message = yourls__( 'This URL is a short URL', 'isq_translation') ) {
 		$error = $genericerror . '<p class="error">' . yourls__( 'You cannot shorten a short URL!', 'isq_translation') . '</p>';
 	}
+
+// Load reCAPTCHA
+require_once('public/recaptchalib.php');
 ?>
 
 <html>
@@ -65,6 +68,11 @@ if ( $message = $url. yourls__( 'added to database', 'isq_translation') ) {
   {lang: "en-GB"}
 </script>
 <?php } ?>
+<script type="text/javascript"><!-- reCAPTCHA -->
+var RecaptchaOptions = {
+	theme : 'clean'
+};
+</script>
 <?php if (!empty(ISQ::$general['clipboard'])) { ?>
 <script type="text/javascript" src="js/jquery.zclip.min.js"></script>
 <script>
diff --git a/index.php b/index.php
index e1a5e4a..8f85efd 100644
--- a/index.php
+++ b/index.php
@@ -6,7 +6,8 @@
 	<p><label for="url" title="<?php yourls_e( 'Paste the long URL here', 'isq_translation'); ?>"><?php yourls_e( 'Long URL (required):', 'isq_translation'); ?></label> <input type="text" id="url" class="right" name="url" /></p>
 	<p><label for="keyword" title="<?php yourls_e( 'A keyword replaces the default short string', 'isq_translation'); ?>"><?php yourls_e( 'Custom keyword:', 'isq_translation'); ?></label> <input type="text" id="keyword" class="right" name="keyword" /></p>
 	<p><label for="title" title="<?php yourls_e( 'Optional title used when sharing a link from YOURLS', 'isq_translation'); ?>"><?php yourls_e( 'Optional title:', 'isq_translation'); ?></label> <input type="text" id="title" class="right" name="title" /></p>
-	<p><label for="antispam" title="<?php yourls_e( 'This is an antispam check. Sorry, we have to do this to prevent the database being overrun by bots!', 'isq_translation'); ?>"><?php yourls_e( 'reCAPTCHA', 'isq_translation'); ?></label> <span class="right"></span></p> 
+	<p><label for="antispam" title="<?php yourls_e( 'This is an antispam check. Sorry, we have to do this to prevent the database being overrun by bots!', 'isq_translation'); ?>"><?php yourls_e( 'reCAPTCHA', 'isq_translation'); ?></label> <span class="right"><?php echo recaptcha_get_html(ISQ::$recaptcha['public']); ?></span></p> 
+
 	<p><input type="submit" value="<?php yourls_e( 'Shorten', 'isq_translation'); ?>" /></p>
 </form>
 
diff --git a/public/config-sample.php b/public/config-sample.php
index f64b9ee..e0b527a 100644
--- a/public/config-sample.php
+++ b/public/config-sample.php
@@ -43,4 +43,11 @@ ISQ::$social = array(
 	'plus' => 1,
 	'linkedin' => 1
 );
+
+// reCAPTCHA API keys
+// Get yourls from https://www.google.com/recaptcha/admin
+ISQ::$recaptcha = array(
+	'public' => '',
+	'private' => ''
+);
 ?>
diff --git a/result.php b/result.php
index be7ac1a..700c1fd 100644
--- a/result.php
+++ b/result.php
@@ -1,20 +1,6 @@
 <?php
 include('header.php');
 
-// antispam
-// if ( isset($_POST['antispam']) && $_POST['antispam'] != user ) {
-// 	exit('<p class="error">' . yourls__( 'Antispam check failed!', 'isq_translation') . '</p>'); 
-// }
-
-$url     = yourls_sanitize_url( $_REQUEST['url'] );
-$keyword = isset( $_REQUEST['keyword'] ) ? yourls_sanitize_keyword( $_REQUEST['keyword'] ): '' ;
-$title   = isset( $_REQUEST['title'] ) ? yourls_sanitize_title( $_REQUEST['title'] ) : '' ;
-$return  = yourls_add_new_link( $url, $keyword, $title );
-		
-$shorturl = isset( $return['shorturl'] ) ? $return['shorturl'] : '';
-$message  = isset( $return['message'] ) ? $return['message'] : '';
-$title    = isset( $return['title'] ) ? $return['title'] : '';
-
 // Stop here if bookmarklet with a JSON callback function ("instant" bookmarklets) -- code from YOURLS
 if( isset( $_GET['jsonp'] ) && $_GET['jsonp'] == 'yourls' ) {
 	$short = $return['shorturl'] ? $return['shorturl'] : '';
@@ -25,6 +11,25 @@ if( isset( $_GET['jsonp'] ) && $_GET['jsonp'] == 'yourls' ) {
 	die();
 }
 
+$resp = recaptcha_check_answer (ISQ::$recaptcha['private'],
+								$_SERVER["REMOTE_ADDR"],
+								$_POST["recaptcha_challenge_field"],
+								$_POST["recaptcha_response_field"]);
+
+if (!$resp->is_valid) {
+	// What happens when the CAPTCHA was entered incorrectly
+	die ( '<p class="error" title="' . $resp->error . '">' . yourls__( 'The reCAPTCHA wasn\'t entered correctly. Go back and try it again.', 'isq_translation' ) . '</p></div></div>' );
+}
+
+$url     = yourls_sanitize_url( $_REQUEST['url'] );
+$keyword = isset( $_REQUEST['keyword'] ) ? yourls_sanitize_keyword( $_REQUEST['keyword'] ): '' ;
+$title   = isset( $_REQUEST['title'] ) ? yourls_sanitize_title( $_REQUEST['title'] ) : '' ;
+$return  = yourls_add_new_link( $url, $keyword, $title );
+		
+$shorturl = isset( $return['shorturl'] ) ? $return['shorturl'] : '';
+$message  = isset( $return['message'] ) ? $return['message'] : '';
+$title    = isset( $return['title'] ) ? $return['title'] : '';
+
 ?>
 
 <!-- Error reporting -->
