Convert png blob to jpg blob in javascript

i have below png blob which i want to convert to jpg blob. How can i achieve that?

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAgQAAAK2CAYAAAAxAIToAAAAAXNSR0IArs4c6QAAIABJREFUeF7s......

Solution

You will have to redraw your blob using html canvas then convert it back to jpg blob, as follows:

var img = await document.createElement("img");
img.src = 'your_base_64_blob_string_here'
img.onload = function (event) {
  // This line is dynamically creating a canvas element
  var canvas = document.createElement("canvas")
  var ctx = canvas.getContext("2d");
  //Resize your image here
  ctx.drawImage(img, 0, 0, 400, 350);
  // To blob
  var jpgBlob = await new Promise(resolve => canvas.toBlob(resolve,'image/jpg', 1)); // refer to canvas.toblob API
  // To file
  var jpgFile = await new File([jpgblob], imagefilename.jpg, {type:'image/jpg'}); // refer to File API
}

I have not tested the code, please inform if it works. Be aware of browser compatibility.

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