How to Convert Base64 to Hex

1. 1Paste or type your Base64 string into the input field.
2. 2The tool automatically validates the Base64 format.
3. 3Choose your preferred hex output format (plain, spaced, prefixed, or array).
4. 4Copy the result or download it for further use.

Code Examples

// Convert Base64 string to hex
function base64ToHex(base64String) {
  // Decode Base64 to binary string
  const binary = atob(base64String);

  // Convert binary string to hex
  let hex = '';
  for (let i = 0; i < binary.length; i++) {
    const hexByte = binary.charCodeAt(i).toString(16).padStart(2, '0');
    hex += hexByte;
  }
  return hex;
}

// Example usage
const base64String = 'SGVsbG8gV29ybGQ=';
const hex = base64ToHex(base64String);
console.log(hex); // Output: 48656c6c6f20576f726c64

// With 0x prefix
console.log('0x' + hex); // Output: 0x48656c6c6f20576f726c64

import base64

def base64_to_hex(base64_string):
    # Decode Base64 to bytes
    byte_data = base64.b64decode(base64_string)

    # Convert bytes to hex
    hex_string = byte_data.hex()
    return hex_string

# Example usage
base64_string = 'SGVsbG8gV29ybGQ='
hex_result = base64_to_hex(base64_string)
print(hex_result)  # Output: 48656c6c6f20576f726c64

# With 0x prefix
print(f'0x{hex_result}')  # Output: 0x48656c6c6f20576f726c64

# With spaces
spaced_hex = ' '.join([hex_result[i:i+2] for i in range(0, len(hex_result), 2)])
print(spaced_hex)  # Output: 48 65 6c 6c 6f 20 57 6f 72 6c 64

<?php
function base64ToHex($base64String) {
    // Decode Base64 to binary
    $binary = base64_decode($base64String);

    // Convert binary to hex
    $hex = bin2hex($binary);
    return $hex;
}

// Example usage
$base64String = 'SGVsbG8gV29ybGQ=';
$hexResult = base64ToHex($base64String);
echo $hexResult;  // Output: 48656c6c6f20576f726c64

// With 0x prefix
echo '0x' . $hexResult;  // Output: 0x48656c6c6f20576f726c64

// As array
$hexArray = str_split($hexResult, 2);
echo implode(', ', array_map(fn($h) => "0x$h", $hexArray));
// Output: 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64
?>

// Convert Base64 string to hex
function base64ToHex(base64String, options = {}) {
  const { format = 'plain' } = options;

  // Create buffer from Base64
  const buffer = Buffer.from(base64String, 'base64');

  // Convert to hex
  let hex = buffer.toString('hex');

  // Format output based on options
  switch (format) {
    case 'spaced':
      return hex.match(/.{1,2}/g).join(' ');
    case 'prefixed':
      return '0x' + hex;
    case 'array':
      return hex.match(/.{1,2}/g).map(h => `0x${h}`).join(', ');
    default:
      return hex;
  }
}

// Example usage
const base64String = 'SGVsbG8gV29ybGQ=';

console.log(base64ToHex(base64String));
// Output: 48656c6c6f20576f726c64

console.log(base64ToHex(base64String, { format: 'spaced' }));
// Output: 48 65 6c 6c 6f 20 57 6f 72 6c 64

console.log(base64ToHex(base64String, { format: 'prefixed' }));
// Output: 0x48656c6c6f20576f726c64

console.log(base64ToHex(base64String, { format: 'array' }));
// Output: 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64

Key Features

• Automatic Base64 validation
• Multiple output formats (plain, spaced, prefixed, array)
• Uppercase/lowercase hex options
• Byte count and size information
• Instant conversion
• Copy to clipboard functionality
• Download converted result
• Client-side processing (secure and private)

Common Use Cases

Frequently Asked Questions