diff --git a/README.md b/README.md
index 38dd4ea..a0f5b3f 100644
--- a/README.md
+++ b/README.md
@@ -8,10 +8,8 @@ A PHP library for generating QR codes for PIX payments, including optional trans
 
 - [Installation](#installation)
 - [Usage](#usage)
-- [Methods](#methods)
-  - [StaticPix::generatePix](#staticpixgeneratepixkey-idtx--amount-000-description--)
-  - [StaticPix::formatField](#staticpixformatfieldid-value)
-  - [StaticPix::calculateCRC16](#staticpixcalculatecrc16data)
+- [Accepted Key Types](#accepted-key-types)
+- [Example Usage](#example-usage)
 
 ## Installation
 
@@ -51,3 +49,47 @@ $pixCode = StaticPix::generatePix('your-pix-key', 'Transaction-ID', 100.00, 'Pay
 echo $pixCode;
 ```
 
+## Accepted Key Types
+
+In the `PixPhp` library, the following types of keys are accepted for generating PIX codes:
+
+1. **CPF (Cadastro de Pessoas Físicas)**
+   - **Format:** `123.456.789-09`
+   - **Description:** A Brazilian individual taxpayer identification number. The library accepts CPF numbers with or without formatting.
+
+2. **CNPJ (Cadastro Nacional da Pessoa Jurídica)**
+   - **Format:** `12.345.678/0001-95`
+   - **Description:** A Brazilian business taxpayer identification number. The library accepts CNPJ numbers with or without formatting.
+
+3. **Email**
+   - **Format:** `example@test.com`
+   - **Description:** A valid email address. The library accepts well-formed email addresses as PIX keys.
+
+4. **Phone**
+   - **Format:** `+55 11 91234-5678`
+   - **Description:** A Brazilian phone number including the country code. The library accepts phone numbers with various formatting styles, including spaces and dashes, while retaining the `+55` prefix.
+
+5. **Random Key**
+   - **Format:** `617ef6be-e18e-427f-919b-6e43bae33400`
+   - **Description:** The Pix random key is a 32-character alphanumeric code, randomly generated by the Central Bank to be linked to a single account.
+
+## Example Usage
+
+You can pass any of the accepted key types to the `generatePix` method:
+
+```php
+// Using CPF
+$pixCodeCpf = StaticPix::generatePix("123.456.789-09", "ID123", 100.00);
+
+// Using CNPJ
+$pixCodeCnpj = StaticPix::generatePix("12.345.678/0001-95", "ID456", 250.50);
+
+// Using Email
+$pixCodeEmail = StaticPix::generatePix("example@test.com", "ID789", 50.00);
+
+// Using Phone
+$pixCodePhone = StaticPix::generatePix("+55 11 91234-5678", "ID101", 75.00);
+
+// Using Random Key
+$pixCodeRandom = StaticPix::generatePix("617ef6be-e18e-427f-919b-6e43bae33400", "ID102", 30.00);
+```
diff --git a/src/PixKey.php b/src/PixKey.php
new file mode 100644
index 0000000..006c6af
--- /dev/null
+++ b/src/PixKey.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace PixPhp;
+
+class PixKey
+{
+    public static function validateKey($key)
+    {
+        // Trim spaces and special characters
+        $key = trim($key);
+
+        // Check if the key is a CPF
+        if (preg_match('/^\d{3}\.\d{3}\.\d{3}-\d{2}$/', $key)) {
+            return 'CPF';
+        }
+
+        // Check if the key is a CNPJ
+        if (preg_match('/^\d{2}\.\d{3}\.\d{3}\/\d{4}-\d{2}$/', $key)) {
+            return 'CNPJ';
+        }
+
+        // Check if the key is an email
+        if (filter_var($key, FILTER_VALIDATE_EMAIL)) {
+            return 'EMAIL';
+        }
+
+        // Check if the key is a phone number
+        if (preg_match('/^\+55 \d{2} \d{5}-\d{4}$/', $key)) {
+            return 'PHONE';
+        }
+
+        // Check if the key is a random key
+        if (preg_match('/^[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i', $key)) {
+            return 'RANDOM';
+        }
+
+        // If the key does not match any known format
+        throw new \InvalidArgumentException('Invalid PIX key.');
+    }
+
+    public static function formatKey($key)
+    {
+        $type = self::validateKey($key);
+
+        // Format the key according to its type
+        switch ($type) {
+            case 'CPF':
+                return preg_replace('/[^\d]/', '', $key);
+            case 'CNPJ':
+                return preg_replace('/[^\d]/', '', $key);
+            case 'EMAIL':
+                return strtolower(trim($key));
+            case 'PHONE':
+                return preg_replace('/[^+\d]/', '', $key);
+            case 'RANDOM':
+                return trim($key);
+            default:
+                throw new \InvalidArgumentException('Invalid PIX key.');
+        }
+    }
+}
diff --git a/src/StaticPix.php b/src/StaticPix.php
index c354749..e12d1f3 100644
--- a/src/StaticPix.php
+++ b/src/StaticPix.php
@@ -29,7 +29,7 @@ public static function calculateCRC16($data)
     public static function generatePix($key, $idTx = '', $amount = 0.00, $description = '')
     {
         $result = "000201";
-        $result .= self::formatField("26", "0014br.gov.bcb.pix" . self::formatField("01", $key));
+        $result .= self::formatField("26", "0014br.gov.bcb.pix" . self::formatField("01", PixKey::formatKey($key)));
         $result .= "52040000"; // Fixed code
         $result .= "5303986";  // Currency (Real)
         if ($amount > 0) {
diff --git a/tests/PixKeyTest.php b/tests/PixKeyTest.php
new file mode 100644
index 0000000..315f0e7
--- /dev/null
+++ b/tests/PixKeyTest.php
@@ -0,0 +1,42 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use PixPhp\PixKey;
+
+class PixKeyTest extends TestCase
+{
+    public function testValidCpf()
+    {
+        $cpf = '123.456.789-09';
+        $this->assertEquals('CPF', PixKey::validateKey($cpf));
+        $this->assertEquals('12345678909', PixKey::formatKey($cpf));
+    }
+
+    public function testValidCnpj()
+    {
+        $cnpj = '12.345.678/0001-95';
+        $this->assertEquals('CNPJ', PixKey::validateKey($cnpj));
+        $this->assertEquals('12345678000195', PixKey::formatKey($cnpj));
+    }
+
+    public function testValidEmail()
+    {
+        $email = 'example@test.com';
+        $this->assertEquals('EMAIL', PixKey::validateKey($email));
+        $this->assertEquals('example@test.com', PixKey::formatKey($email));
+    }
+
+    public function testValidPhone()
+    {
+        $phone = '+55 11 91234-5678';
+        $this->assertEquals('PHONE', PixKey::validateKey($phone));
+        $this->assertEquals('+5511912345678', PixKey::formatKey($phone));
+    }
+
+    public function testInvalidKey()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $invalidKey = 'invalid_key';
+        PixKey::validateKey($invalidKey);
+    }
+}
diff --git a/tests/StaticPixTest.php b/tests/StaticPixTest.php
index 3804d9d..c5f3cc5 100644
--- a/tests/StaticPixTest.php
+++ b/tests/StaticPixTest.php
@@ -16,15 +16,15 @@ public function testFormatField()
 
     public function testCalculateCRC16()
     {
-        $data = "00020126330014br.gov.bcb.pix0111chave-teste5204000053039865406100.005802BR5901N6001C62090505ID1236304";
+        $data = "00020126580014br.gov.bcb.pix0136617ef6be-e18e-427f-919b-6e43bae3340052040000530398654041.005802BR5901N6001C6205050116304";
         $crc = StaticPix::calculateCRC16($data);
-        $this->assertEquals("9F03", $crc);
+        $this->assertEquals("2BD6", $crc);
     }
 
     public function testGeneratePixWithoutDescription()
     {
-        $pixCode = StaticPix::generatePix("chave-teste", "ID123", 100.00);
-        $this->assertStringContainsString("0014br.gov.bcb.pix0111chave-teste", $pixCode);
+        $pixCode = StaticPix::generatePix("617ef6be-e18e-427f-919b-6e43bae33400", "ID123", 100.00);
+        $this->assertStringContainsString("0014br.gov.bcb.pix0136617ef6be-e18e-427f-919b-6e43bae33400", $pixCode);
         $this->assertStringContainsString("52040000", $pixCode); // Fixed code
         $this->assertStringContainsString("5303986", $pixCode);  // Currency (Real)
         $this->assertStringContainsString("5406100.00", $pixCode); // Amount
@@ -40,8 +40,8 @@ public function testGeneratePixWithoutDescription()
 
     public function testGeneratePixWithDescription()
     {
-        $pixCode = StaticPix::generatePix("chave-teste", "ID123", 100.00, "Pagamento de teste");
-        $this->assertStringContainsString("0014br.gov.bcb.pix0111chave-teste", $pixCode);
+        $pixCode = StaticPix::generatePix("617ef6be-e18e-427f-919b-6e43bae33400", "ID123", 100.00, "Pagamento de teste");
+        $this->assertStringContainsString("0014br.gov.bcb.pix0136617ef6be-e18e-427f-919b-6e43bae33400", $pixCode);
         $this->assertStringContainsString("52040000", $pixCode); // Fixed code
         $this->assertStringContainsString("5303986", $pixCode);  // Currency (Real)
         $this->assertStringContainsString("5406100.00", $pixCode); // Amount
@@ -58,7 +58,59 @@ public function testGeneratePixWithDescription()
 
     public function testGeneratePixWithZeroAmount()
     {
-        $pixCode = StaticPix::generatePix("chave-teste", "ID123", 0.00);
+        $pixCode = StaticPix::generatePix("617ef6be-e18e-427f-919b-6e43bae33400", "ID123", 0.00);
         $this->assertStringNotContainsString("54", $pixCode); // Amount should not be included for 0.00
     }
+
+    public function testGeneratePixWithCpf()
+    {
+        $pixKey = '123.456.789-09'; // Example CPF
+        $pixCode = StaticPix::generatePix($pixKey, "ID123", 100.00);
+
+        $this->assertStringContainsString("0014br.gov.bcb.pix011112345678909", $pixCode); // Formatted CPF
+        $this->assertStringContainsString("5406100.00", $pixCode); // Amount
+
+        // Calculates CRC16 for code without part 6304
+        $pixCodeWithoutCRC = substr($pixCode, 0, -4); // Remove the CRC part and its size
+        $this->assertStringEndsWith("6304" . StaticPix::calculateCRC16($pixCodeWithoutCRC), $pixCode); // CRC16
+    }
+
+    public function testGeneratePixWithCnpj()
+    {
+        $pixKey = '12.345.678/0001-95'; // Example CNPJ
+        $pixCode = StaticPix::generatePix($pixKey, "ID456", 250.50);
+
+        $this->assertStringContainsString("0014br.gov.bcb.pix011412345678000195", $pixCode); // Formatted CNPJ
+        $this->assertStringContainsString("5406250.50", $pixCode); // Amount
+
+        // Calculates CRC16 for code without part 6304
+        $pixCodeWithoutCRC = substr($pixCode, 0, -4); // Remove the CRC part and its size
+        $this->assertStringEndsWith("6304" . StaticPix::calculateCRC16($pixCodeWithoutCRC), $pixCode); // CRC16
+    }
+
+    public function testGeneratePixWithEmail()
+    {
+        $pixKey = 'example@test.com'; // Example Email
+        $pixCode = StaticPix::generatePix($pixKey, "ID789", 250.50);
+
+        $this->assertStringContainsString("0014br.gov.bcb.pix0116example@test.com", $pixCode); // Formatted Email
+        $this->assertStringContainsString("5406250.50", $pixCode); // Amount
+
+        // Calculates CRC16 for code without part 6304
+        $pixCodeWithoutCRC = substr($pixCode, 0, -4); // Remove the CRC part and its size
+        $this->assertStringEndsWith("6304" . StaticPix::calculateCRC16($pixCodeWithoutCRC), $pixCode); // CRC16
+    }
+
+    public function testGeneratePixWithPhone()
+    {
+        $pixKey = '+55 11 91234-5678'; // Example Phone
+        $pixCode = StaticPix::generatePix($pixKey, "ID789", 250.50);
+
+        $this->assertStringContainsString("0014br.gov.bcb.pix0114+5511912345678", $pixCode); // Formatted Email
+        $this->assertStringContainsString("5406250.50", $pixCode); // Amount
+
+        // Calculates CRC16 for code without part 6304
+        $pixCodeWithoutCRC = substr($pixCode, 0, -4); // Remove the CRC part and its size
+        $this->assertStringEndsWith("6304" . StaticPix::calculateCRC16($pixCodeWithoutCRC), $pixCode); // CRC16
+    }
 }