diff --git a/src/Mixin/StrMixin.php b/src/Mixin/StrMixin.php
new file mode 100644
index 0000000..6bed233
--- /dev/null
+++ b/src/Mixin/StrMixin.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Laravolt\Support\Mixin;
+
+class StrMixin
+{
+    public function mask()
+    {
+        return function ($str, $first, $last, $mask = '*') {
+            $len = strlen($str);
+            $toShow = $first + $last;
+
+            return substr($str, 0, $len <= $toShow ? 0 : $first) . str_repeat($mask,
+                    $len - ($len <= $toShow ? 0 : $toShow)) . substr($str, $len - $last, $len <= $toShow ? 0 : $last);
+        };
+    }
+
+    public function maskEmail()
+    {
+        return function ($email) {
+            $mails = explode("@", $email);
+            $domain = $mails[1] ?? "";
+
+            $mails[0] = mask($mails[0], 3, 2);
+            $domain = mask($domain, 3, 2);
+            $mails[1] = $domain;
+
+            return implode("@", $mails);
+        };
+    }
+}
diff --git a/src/SupportServiceProvider.php b/src/SupportServiceProvider.php
index 772ebe5..37ac76d 100644
--- a/src/SupportServiceProvider.php
+++ b/src/SupportServiceProvider.php
@@ -7,7 +7,9 @@
 use Illuminate\Database\Eloquent\Builder as EloquentBuilder;
 use Illuminate\Database\Query\Builder;
 use Illuminate\Support\ServiceProvider;
+use Illuminate\Support\Str;
 use Laravolt\Support\Mixin\QueryBuilderMixin;
+use Laravolt\Support\Mixin\StrMixin;
 
 class SupportServiceProvider extends ServiceProvider
 {
@@ -23,6 +25,7 @@ public function boot()
     protected function registerMacro()
     {
         Builder::mixin(new QueryBuilderMixin());
+        Str::mixin(new StrMixin());
 
         EloquentBuilder::macro('whereLike', function ($attributes, ?string $searchTerm) {
             if ($searchTerm === null) {