diff --git a/src/pages/string/index.ts b/src/pages/string/index.ts
index f7eed37..43714ca 100644
--- a/src/pages/string/index.ts
+++ b/src/pages/string/index.ts
@@ -1,3 +1,4 @@
+import { tool as stringRot13 } from './rot13/meta';
 import { tool as stringReverse } from './reverse/meta';
 import { tool as stringRandomizeCase } from './randomize-case/meta';
 import { tool as stringUppercase } from './uppercase/meta';
diff --git a/src/pages/string/rot13/index.tsx b/src/pages/string/rot13/index.tsx
new file mode 100644
index 0000000..2814f13
--- /dev/null
+++ b/src/pages/string/rot13/index.tsx
@@ -0,0 +1,11 @@
+import { Box } from '@mui/material';
+import React from 'react';
+import * as Yup from 'yup';
+
+const initialValues = {};
+const validationSchema = Yup.object({
+  // splitSeparator: Yup.string().required('The separator is required')
+});
+export default function Rot13() {
+  return <Box>Lorem ipsum</Box>;
+}
\ No newline at end of file
diff --git a/src/pages/string/rot13/meta.ts b/src/pages/string/rot13/meta.ts
new file mode 100644
index 0000000..86ee585
--- /dev/null
+++ b/src/pages/string/rot13/meta.ts
@@ -0,0 +1,13 @@
+import { defineTool } from '@tools/defineTool';
+import { lazy } from 'react';
+// import image from '@assets/text.png';
+
+export const tool = defineTool('string', {
+  name: 'Rot13',
+  path: 'rot13',
+  // image,
+  description: '',
+  shortDescription: '',
+  keywords: ['rot13'],
+  component: lazy(() => import('./index'))
+});
\ No newline at end of file
diff --git a/src/pages/string/rot13/rot13.service.test.ts b/src/pages/string/rot13/rot13.service.test.ts
new file mode 100644
index 0000000..ce7fac5
--- /dev/null
+++ b/src/pages/string/rot13/rot13.service.test.ts
@@ -0,0 +1,58 @@
+import { expect, describe, it } from 'vitest';
+import { rot13 } from './service';
+
+describe('rot13', () => {
+  it('should encode a simple string using ROT13', () => {
+    const input = 'hello';
+    const result = rot13(input);
+    expect(result).toBe('uryyb');
+  });
+
+  it('should decode a ROT13 encoded string', () => {
+    const input = 'uryyb';
+    const result = rot13(input);
+    expect(result).toBe('hello');
+  });
+
+  it('should handle uppercase letters correctly', () => {
+    const input = 'HELLO';
+    const result = rot13(input);
+    expect(result).toBe('URYYB');
+  });
+
+  it('should handle mixed case letters correctly', () => {
+    const input = 'HelloWorld';
+    const result = rot13(input);
+    expect(result).toBe('UryybJbeyq');
+  });
+
+  it('should handle non-alphabetic characters correctly', () => {
+    const input = 'Hello, World!';
+    const result = rot13(input);
+    expect(result).toBe('Uryyb, Jbeyq!');
+  });
+
+  it('should handle an empty string', () => {
+    const input = '';
+    const result = rot13(input);
+    expect(result).toBe('');
+  });
+
+  it('should handle a string with numbers correctly', () => {
+    const input = '1234';
+    const result = rot13(input);
+    expect(result).toBe('1234');
+  });
+
+  it('should handle a string with symbols correctly', () => {
+    const input = '!@#$%^&*()_+-=';
+    const result = rot13(input);
+    expect(result).toBe('!@#$%^&*()_+-=');
+  });
+
+  it('should handle a string with mixed characters correctly', () => {
+    const input = 'Hello, World! 123';
+    const result = rot13(input);
+    expect(result).toBe('Uryyb, Jbeyq! 123');
+  });
+});
diff --git a/src/pages/string/rot13/service.ts b/src/pages/string/rot13/service.ts
new file mode 100644
index 0000000..5030598
--- /dev/null
+++ b/src/pages/string/rot13/service.ts
@@ -0,0 +1,7 @@
+export function rot13(input: string): string {
+  return input.replace(/[a-zA-Z]/g, (char) => {
+    const charCode = char.charCodeAt(0);
+    const baseCode = charCode >= 97 ? 97 : 65; // 'a' or 'A'
+    return String.fromCharCode(((charCode - baseCode + 13) % 26) + baseCode);
+  });
+}