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Editorial Team
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Asked: 2026-06-18T10:50:49+00:00

I am trying to create a PDF file with JavaScript using jsPDF . I

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I am trying to create a PDF file with JavaScript using jsPDF. I have a little test page. Basically I have a download PDF button that takes the base64 image from a span and uses that for the imgData. I then try to addImage that image data to the pdf and then save it. Everything seems to work, it generates the PDF and prompts for download. However when I try to look at the PDF with xpdf or Foxit reader I am told the PDF is corrupted. Am I creating this PDF incorrectly? My web page is pretty long, so I put it on Pastebin.

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />   
<script type="text/javascript" src="js/jquery/jquery-1.7.1.min.js"></script>
<script type="text/javascript" src="js/jquery/jquery-ui-1.8.17.custom.min.js"></script>
<script type="text/javascript" src="../jspdf.js"></script>
<script type="text/javascript" src="../libs/FileSaver.js/FileSaver.js"></script>
<script type="text/javascript" src="../libs/BlobBuilder.js/BlobBuilder.js"></script>
<script type="text/javascript" src="../jspdf.plugin.addimage.js"></script>
<script type="text/javascript" src="../jspdf.plugin.standard_fonts_metrics.js"></script>
<script type="text/javascript" src="../jspdf.plugin.split_text_to_size.js"></script>
<script type="text/javascript" src="../jspdf.plugin.from_html.js"></script>
<script type="text/javascript" src="js/basic.js"></script>
<title>Sup!</title>
<script>
function changeCan() {
  var c = document.getElementById("myCanvas");
  var ctx = c.getContext("2d");
  ctx.fillStyle="#FF0000";
  ctx.fillRect(0,0,128,128);
}
function changeCan3() {
  var c = document.getElementById("myCanvas");
  var ctx = c.getContext("2d");
  ctx.fillStyle="#FFFFFF";
  ctx.fillRect(0,0,128,128);
  var image = new Image();
  image.src = document.getElementById("3span").innerHTML;
  ctx.drawImage(image,0,0);
}
function changeCan4() {
  var imgData = document.getElementById("3span").innerHTML;
  window.alert(imgData.length);
  var doc = new jsPDF();
  doc.addImage(imgData, 'JPEG', 15, 40, 128, 128);
  doc.save('Test.pdf');
}
</script>
</head>
<body>
  Yo!<hr>
  <canvas id="myCanvas" width="128" height="128"></canvas><hr>
  <button type="button" onClick="changeCan()">Change Me To Red!</button>
  <button type="button" onClick="changeCan3()">Change Me To Span!</button>
  <button type="button" onClick="changeCan4()">Download Me!</button>
  <hr>
  <span id="3span" style="display:none;">B64 DATA HERE</span>
</body>
</html>
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1 Answer

  1. Editorial Team

    I had similar problem, and this is how is solved it. I used Blob.js, canvas-toBlob, FileSaver. I also noticed that latest BlobBuilder.min.js is not working correcly, so I used BlobBuilder.js instead.

    var content = canvas.toDataURL('image/jpeg');
var doc = new jsPDF('landscape');
doc.addImage(content, 'JPEG', 0, 0);

var data = doc.output();
var buffer = new ArrayBuffer(data.length);
var array = new Uint8Array(buffer);

for (var i = 0; i < data.length; i++) {
    array[i] = data.charCodeAt(i);
}

var blob = new Blob(
    [array],
    {type: 'application/pdf', encoding: 'raw'}
);

saveAs(blob, filename);
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