Answers for "convert getcanvas.todataurl to png"

how to convert a html canvas into a png file

let canvas = document.getElementById("mycanvas");
let img = canvas.toDataURL("image/png");
document.write('<img src="'+img+'"/>');

convert canvas to DataUrl and insert image in google sheet

function savejSigToSht() {

        var dataURL = canvas.toDataURL('image/png');

        google.script.run.insertSig(dataURL);
        google.script.host.close();
    }