byte[] data = "Hello World".getBytes("UTF-8"); String encodedString = Base64.getUrlEncoder().encodeToString(data); System.out.println("Encoded String (URL safe): " + encodedString); byte[] decodedData = Base64.getUrlDecoder().decode(encodedString); String decodedString = new String(decodedData, "UTF-8"); System.out.println("Decoded String (URL safe): " + decodedString); String urlSafeCharacters = "-_@#"; Base64.Encoder encoder = Base64.getUrlEncoder().setURLSafeCharset(urlSafeCharacters);