diff --git a/shurly.module b/shurly.module
index 7d76d4b..6aed980 100644
--- a/shurly.module
+++ b/shurly.module
@@ -1025,3 +1025,41 @@ function _shurly_language_stub() {
   }
   return $language;
 }
+
+/**
+ * Implements hook_filter_info().
+ */
+function shurly_filter_info() {
+  $filters = array();
+  $filters['shurly'] = array(
+    'title' => t("Shorten all outgoing URL's"),
+    'description' => t("Shorten all outgoing URL's."),
+    'process callback' => '_shurly_filter_process',
+    'tips callback' => '_shurly_filter_tips',
+  );
+
+  return $filters;
+}
+
+/**
+ * Process callback for shurly filter.
+ */
+function _shurly_filter_process($text, $filter) {
+  // Find all a tags containing a full URL.
+  preg_match_all('/<a[^>]*href="(http[^"]*)"[^>]*>/i', $text, $links);
+  if (!empty($links)) {
+    $links = $links[1];
+    foreach ($links as $key => $link) {
+      $short_url = shurly_shorten($link);
+      $text = str_replace('"' . $link . '"', '"' . $short_url['shortUrl'] . '"', $text);
+    }
+  }
+  return $text;
+}
+
+/**
+ * Implements callback_filter_tips().
+ */
+function _shurly_filter_tips($filter, $format, $long = FALSE) {
+  return t('All links starting with http or https will be replaced.');
+}