diff --git a/src/Formatters/Integer.php b/src/Formatters/Integer.php
new file mode 100644
index 0000000..fbf045f
--- /dev/null
+++ b/src/Formatters/Integer.php
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * This file is part of web3.php package.
+ * 
+ * (c) Kuan-Cheng,Lai <alk03073135@gmail.com>
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
+namespace Web3\Formatters;
+
+use InvalidArgumentException;
+use Web3\Utils;
+use Web3\Formatters\IFormatter;
+
+class Integer implements IFormatter
+{
+    /**
+     * format
+     * 
+     * @param mixed $value
+     * @return string
+     */
+    public static function format($value)
+    {
+        $bn = Utils::toBn($value);
+        $bnHex = $bn->toHex(true);
+        $padded = mb_substr($bnHex, 0, 1);
+        
+        return implode('', array_fill(0, 64-mb_strlen($bnHex), $padded)) . $bnHex;
+    }
+}
\ No newline at end of file
diff --git a/test/unit/IntegerFormatterTest.php b/test/unit/IntegerFormatterTest.php
new file mode 100644
index 0000000..5885f69
--- /dev/null
+++ b/test/unit/IntegerFormatterTest.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace Test\Unit;
+
+use Test\TestCase;
+use Web3\Formatters\Integer;
+
+class IntegerFormatterTest extends TestCase
+{
+    /**
+     * formatter
+     * 
+     * @var \Web3\Formatters\Integer
+     */
+    protected $formatter;
+
+    /**
+     * setUp
+     * 
+     * @return void
+     */
+    public function setUp()
+    {
+        parent::setUp();
+        $this->formatter = new Integer;
+    }
+
+    /**
+     * testFormat
+     * 
+     * @return void
+     */
+    public function testFormat()
+    {
+        $formatter = $this->formatter;
+
+        $hex = $formatter->format('1');
+
+        $this->assertEquals($hex, implode('', array_fill(0, 63, '0')) . '1');
+
+        $hex = $formatter->format('-1');
+
+        $this->assertEquals($hex, implode('', array_fill(0, 64, 'f')));
+
+        $hex = $formatter->format('ae');
+
+        $this->assertEquals($hex, implode('', array_fill(0, 62, '0')) . 'ae');
+    }
+}
\ No newline at end of file