diff --git a/Rules/ToLower.php b/Rules/ToLower.php
new file mode 100644
index 0000000..0f1faea
--- /dev/null
+++ b/Rules/ToLower.php
@@ -0,0 +1,65 @@
+<?php
+
+namespace DMS\Filter\Rules;
+
+use DMS\Filter\Exception\FilterException;
+
+/**
+ * ToLower Rule
+ * 
+ * @package DMS
+ * @subpackage Filter
+ * 
+ * @Annotation
+ */
+class ToLower extends Rule
+{
+    /**
+     * Encoding to be used
+     * 
+     * @var string
+     */
+    public $encoding = null;
+    
+    /**
+     * {@inheritDoc}
+     */
+    public function applyFilter($value)
+    {
+        if ($this->useEncoding()) {
+            return mb_strtolower((string) $value, $this->encoding);
+        }
+
+        return strtolower((string) $value);
+    }
+
+    /**
+     * Verify is encoding is set and if we have the proper
+     * function to use it
+     * 
+     * @return boolean
+     */
+    public function useEncoding()
+    {
+        if ($this->encoding === null) {
+            return false;
+        }
+        
+        if (!function_exists('mb_strtolower')) {
+            throw new FilterException(
+                'mbstring is required to use ToLower with an encoding.');
+        }
+
+        $this->encoding = (string) $this->encoding;
+        $encodings = array_map('strtolower', mb_list_encodings());
+        
+        if (!in_array(strtolower($this->encoding), $encodings)) {
+            throw new FilterException(
+                "mbstring does not support the '".$this->encoding."' encoding"
+            );
+        }
+
+        return true;
+    }
+     
+}
\ No newline at end of file
diff --git a/Rules/ToUpper.php b/Rules/ToUpper.php
new file mode 100644
index 0000000..5f62700
--- /dev/null
+++ b/Rules/ToUpper.php
@@ -0,0 +1,65 @@
+<?php
+
+namespace DMS\Filter\Rules;
+
+use DMS\Filter\Exception\FilterException;
+
+/**
+ * ToUpper Rule
+ * 
+ * @package DMS
+ * @subpackage Filter
+ * 
+ * @Annotation
+ */
+class ToUpper extends Rule
+{
+    /**
+     * Encoding to be used
+     * 
+     * @var string
+     */
+    public $encoding = null;
+    
+    /**
+     * {@inheritDoc}
+     */
+    public function applyFilter($value)
+    {
+        if ($this->useEncoding()) {
+            return mb_strtoupper((string) $value, $this->encoding);
+        }
+
+        return strtoupper((string) $value);
+    }
+
+    /**
+     * Verify is encoding is set and if we have the proper
+     * function to use it
+     * 
+     * @return boolean
+     */
+    public function useEncoding()
+    {
+        if ($this->encoding === null) {
+            return false;
+        }
+        
+        if (!function_exists('mb_strtoupper')) {
+            throw new FilterException(
+                'mbstring is required to use ToLower with an encoding.');
+        }
+
+        $this->encoding = (string) $this->encoding;
+        $encodings = array_map('strtolower', mb_list_encodings());
+        
+        if (!in_array(strtolower($this->encoding), $encodings)) {
+            throw new FilterException(
+                "mbstring does not support the '".$this->encoding."' encoding"
+            );
+        }
+
+        return true;
+    }
+    
+}
\ No newline at end of file