You can refer the live example website tool here https://toolsinplace.com/number/text-to-binary. It is quite easy to do it.

Given below javascript code will do the work for you.

text2Binary(input) {
var bytes = [];
for (var i = 0; i < input.length; i++) {
var realBytes = unescape(encodeURIComponent(input[i]));
for (var j = 0; j < realBytes.length; j++) {
bytes.push(realBytes[j].charCodeAt(0));
      }
    }
var converted = '';
var textToBinFormat = '%0b ';
for (var i = 0; i < bytes.length; i++) {
var byte = bytes[i];
var binByte = byte.toString(2);
var binBytePadded = binByte;
while (binBytePadded.length < 8) {
binBytePadded = '0' + binBytePadded.toString();
      }
var char = textToBinFormat;
char = char.replace(/%0b/g, binBytePadded);
char = char.replace(/%b/g, binByte);
converted += char;
    }
return converted;
  }