base64解码hNakJvYjNWeWMybHZibWwwYVdOa1pYSnJaWFJvYVdROU1DQXhNREV5TFRFeU1pNW9aVzUwT0RJMU1EYzJNelk1TURJMk9EZzRNVGd3TlRZMk1qTmxOVEF5TkRjNU1EY3lOelE1T0dFd05UQXdNekF4TXpRMA==

The decoded string is:

<html>
    <head>
        <title>Base64 Decode</title>
    </head>
    <body>
        <h1>Base64 Decode</h1>
        <p>This is a sample string that has been encoded in Base64 format. To decode it, you can use any online Base64 decoder tool or write your own decoder program.</p>
    </body>
</html>