Convert HTML5 Canvas into File to be uploaded?

For security reasons, you can’t set the value of a file-input element directly.

If you want to use a file-input element:

1. Create an image from the canvas (as you’ve done).
2. Display that image on a new page.
3. Have the user right-click-save-as to their local drive.
4. Then they can use your file-input element to upload that newly created file.

Alternatively, you can use Ajax to POST the canvas data:

You asked about blob:

var blobBin = atob(dataURL.split(',')[1]);
var array = [];
for(var i = 0; i < blobBin.length; i++) {
    array.push(blobBin.charCodeAt(i));
}
var file=new Blob([new Uint8Array(array)], {type: 'image/png'});


var formdata = new FormData();
formdata.append("myNewFileName", file);
$.ajax({
   url: "uploadFile.php",
   type: "POST",
   data: formdata,
   processData: false,
   contentType: false,
}).done(function(respond){
  alert(respond);
});

Note: blob is generally supported in the latest browsers.