<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/0.4.1/html2canvas.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.3.4/jspdf.debug.js"></script>
<button class="btn"  id="btn" onClick="printToPDF();">

  Export to PDF
</button>
<div id="page">content</div>
<script>

function printToPDF() {
      btn.innerText  = "Converting...";

  console.log('Converting...');
  

  var printableArea = document.getElementById('page');

  html2canvas(printableArea, {
    useCORS: true,
    onrendered: function(canvas) {

      var pdf = new jsPDF('a', 'pt', 'a4');

      var pageHeight = 1200;
      var pageWidth = 1000;
      for (var i = 0; i <= printableArea.clientHeight / pageHeight; i++) {
        var srcImg = canvas;
        var sX = 0;
        var sY = pageHeight * i; // start 1 pageHeight down for every new page
        var sWidth = pageWidth;
        var sHeight = pageHeight;
        var dX = 0;
        var dY = 0;
        var dWidth = pageWidth;
        var dHeight = pageHeight;

        window.onePageCanvas = document.createElement("canvas");
        onePageCanvas.setAttribute('width', pageWidth);
        onePageCanvas.setAttribute('height', pageHeight);
        var ctx = onePageCanvas.getContext('2d');
        ctx.drawImage(srcImg, sX, sY, sWidth, sHeight, dX, dY, dWidth, dHeight);

        var canvasDataURL = onePageCanvas.toDataURL("image/png", 1.0);
        var width = onePageCanvas.width;
        var height = onePageCanvas.clientHeight;

        if (i > 0) // if we're on anything other than the first page, add another page
          pdf.addPage(612, 791); // 8.5" x 11" in pts (inches*72)

        pdf.setPage(i + 1); // now we declare that we're working on that page
        pdf.addImage(canvasDataURL, 'PNG', 20, 40, (width * .62), (height * .62)); // add content to the page

      }
      var today = new Date();
var date = today.getFullYear()+'-'+(today.getMonth()+1)+'-'+today.getDate();
      pdf.save(date+'.pdf');
         btn.innerText  = " Export to PDF";
    }
  });
}
</script>