diff --git a/src/Ulid.php b/src/Ulid.php
index e961427..669788b 100644
--- a/src/Ulid.php
+++ b/src/Ulid.php
@@ -166,4 +166,13 @@ private function decodeTime(string $time): int
 
         return $carry;
     }
+
+    public static function isValid(String $ulid)
+    {
+        if (strlen($ulid) !== static::TIME_LENGTH + static::RANDOM_LENGTH) {
+            return false;
+        }
+
+        return !preg_match('/[^abcdefghjkmnpqrstvwxyz0-9]/i', $ulid);
+    }
 }
diff --git a/tests/UlidTest.php b/tests/UlidTest.php
index e05b433..ac7a119 100644
--- a/tests/UlidTest.php
+++ b/tests/UlidTest.php
@@ -144,4 +144,20 @@ public function testAddsRandomnessWhenGeneratedMultipleTimesByFromTimestamp(): v
         $this->assertEquals(substr($a, 0, -1), substr($b, 0, -1));
         $this->assertNotEquals($a->getRandomness(), $b->getRandomness());
     }
+
+    public function testValidateUlid(): void
+    {
+        //contain invalidate letter i at the end
+        $res = Ulid::isValid('01b8kyr6g8bc61ce8r6k2t16hi');
+        $res2 = Ulid::isValid('01b8kyr6g8bc61ce8r6k2t16hy');
+        $res3 = Ulid::isValid('00000000000000000000longerthan26');
+        $res4 = Ulid::isValid(Ulid::generate());
+        $res5 = Ulid::isValid(Ulid::generate(true));
+
+        $this->assertFalse($res);
+        $this->assertTrue($res2);
+        $this->assertFalse($res3);
+        $this->assertTrue($res4);
+        $this->assertTrue($res5);
+    }
 }