Convert Base64 to Blob

function base64ToBlob(data) {
    var byteString = atob(data.split(',')[1]);
    var mimeString = data.split(',')[0].split(':')[1].split(';')[0]

    var ab = new ArrayBuffer(byteString.length);
    var ia = new Uint8Array(ab);
    for (var i = 0; i < byteString.length; i++) {
        ia[i] = byteString.charCodeAt(i);
    }

    var blob = new Blob([ab]);
    return blob;
}