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<!DOCTYPE html> <html> <body> <p>Click the button to decode a base-64 encoded string.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> The atob() method is not supported in IE9 and earlier.</p> <p id="demo"></p> <script> function myFunction() { var str = "Hello World!"; var enc = window.btoa(str); var dec = window.atob(enc); var res = "Encoded String: " + enc + "<br>" + "Decoded String: " + dec; document.getElementById("demo").innerHTML = res; } </script> </body> </html>