Quick one: using download attribute on links to save Canvas as PNG

Tuesday, April 22nd, 2014 at 9:09 pm

One of the things I always liked about Firefox is that you can right-click any canvas and select “save image as”. Chrome and others don’t do that (well, Chrome doesn’t). Instead you need to get the image data, create a url and open a new tab or something in that order.

One very simple way to allow people to save a canvas as an image (and name it differently – which would have to be done by hand in the case of right-clicking on Firefox) is to use the download attribute of a link.

You can see this in action in this JSFiddle. Simply paint something and click the “download image” link.

The relevant code is short and sweet (canvas is the reference of the canvas element):

var link = document.createElement('a');
link.innerHTML = 'download image';
link.addEventListener('click', function(ev) {
    link.href = canvas.toDataURL();
    link.download = "mypainting.png";
}, false);
document.body.appendChild(link);

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