diff --git a/src/Illuminate/Database/Eloquent/Model.php b/src/Illuminate/Database/Eloquent/Model.php
index f1d0564aaeed..89608957e12c 100644
--- a/src/Illuminate/Database/Eloquent/Model.php
+++ b/src/Illuminate/Database/Eloquent/Model.php
@@ -2793,6 +2793,17 @@ protected function isEncryptCastable($key)
         return $this->hasCast($key, ['encrypted']);
     }
 
+    /**
+     * Determine whether a value should be encrypted.
+     *
+     * @param  string  $key
+     * @return bool
+     */
+    protected function isBase64Castable($key)
+    {
+        return $this->hasCast($key, ['base64']);
+    }
+
     /**
      * Determine whether a value is JSON castable for inbound manipulation.
      *
@@ -2850,6 +2861,8 @@ protected function castAttribute($key, $value)
                 return new BaseCollection($this->fromJson($value));
             case 'encrypt':
                 return decrypt($value);
+            case 'base64':
+                return base64_decode($value);
             case 'date':
             case 'datetime':
                 return $this->asDateTime($value);
@@ -2889,6 +2902,10 @@ public function setAttribute($key, $value)
             $value = $this->asEncrypted($value);
         }
 
+        if ($this->isBase64Castable($key) && ! is_null($value)) {
+            $value = $this->asBase64($value);
+        }
+
         if ($this->isJsonCastable($key) && ! is_null($value)) {
             $value = $this->asJson($value);
         }
@@ -3063,6 +3080,17 @@ protected function asEncrypted($value)
         return encrypt($value);
     }
 
+    /**
+     * Encode the given value.
+     *
+     * @param  mixed  $value
+     * @return string
+     */
+    protected function asBase64($value)
+    {
+        return base64_encode($value);
+    }
+
     /**
      * Encode the given value as JSON.
      *