Save inline SVG as JPEG/PNG/SVG

Save inline SVG as JPEG/PNG/SVG - javascript

I have an inline SVG in my html, and I need to be able to save this as either a JPEG, PNG or SVG.
I have tried a few different methods with converting the SVG to canvas and then converting to JPEG, but I haven't been able to get these working.
Here is an example of my inline SVG.
.font {
color: #ffffff;
font-family: Roboto;
font-weight: bold;
text-transform: uppercase;
}
.name {
font-size: 64pt;
}
.top-bar-text {
font-size: 32pt;
}
.font tspan {
dominant-baseline: middle;
}
<link href='http://fonts.googleapis.com/css?family=Roboto:700' rel='stylesheet' type='text/css'>
<svg width="256" height="256" id="icon">
<rect class="bg1" id="bg_color_1" x="0" y="0" width="256" height="256" fill="#4cbc5a" />
<path class="bg2" id="bg_color_2" d="M 0 96 L0,256 L256,256 L256,96 s -128 96 -256 0" fill="#08a21c" />
<text id="left_corner_text" x="24" y="36" width="48" height="64" class="top_bar lct font top-bar-text" text-anchor="middle" fill="#ffffff"><tspan>1</tspan></text>
<text id="right_corner_text" x="232" y="36" width="48" height="64" class="top_bar rct font top-bar-text" text-anchor="middle" fill="#ffffff"><tspan>2</tspan></text>
<text id="line_1_text" transform="scale(1,2)" x="128" y="90" width="256" height="192" class="l1t font name" text-anchor="middle" fill="#ffffff"><tspan>ABC</tspan></text>
</svg>
Also, not all the elements need to be exported, as some of the options the user has is to remove the top corner numbers.
I would like for when it's been converted to download straight to the browser.

Nowadays this is pretty simple.
The basic idea is:
SVG to canvas
canvas to dataUrl
trigger download from dataUrl
it actually works outside of the Stack Overflow snippet
var btn = document.querySelector('button');
var svg = document.querySelector('svg');
var canvas = document.querySelector('canvas');
function triggerDownload (imgURI) {
var evt = new MouseEvent('click', {
view: window,
bubbles: false,
cancelable: true
});
var a = document.createElement('a');
a.setAttribute('download', 'MY_COOL_IMAGE.png');
a.setAttribute('href', imgURI);
a.setAttribute('target', '_blank');
a.dispatchEvent(evt);
}
btn.addEventListener('click', function () {
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var data = (new XMLSerializer()).serializeToString(svg);
var DOMURL = window.URL || window.webkitURL || window;
var img = new Image();
var svgBlob = new Blob([data], {type: 'image/svg+xml;charset=utf-8'});
var url = DOMURL.createObjectURL(svgBlob);
img.onload = function () {
ctx.drawImage(img, 0, 0);
DOMURL.revokeObjectURL(url);
var imgURI = canvas
.toDataURL('image/png')
.replace('image/png', 'image/octet-stream');
triggerDownload(imgURI);
};
img.src = url;
});
<button>svg to png</button>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="200" height="200">
<rect x="10" y="10" width="50" height="50" />
<text x="0" y="100">Look, i'm cool</text>
</svg>
<canvas id="canvas"></canvas>
Regarding the downloading part, you can set up a filename and etc etc (although not in this example). Some days ago I answered a question on how to download a specific portion of HTML from the given page. It might be useful regarding the downloading part: https://stackoverflow.com/a/28087280/2178180
update: now letting you specify the filename

Here's a solution that works in IE11 as well.
I just did a bunch of testing of various methods of this and while the above answer by Ciro Costa is fantastic in that it works in Firefox and Chrome it does not work in IE11. IE11 fails due to a security issue with rendering an svg to the canvas which requires a canvas implementation, canvg. Here's a solution using canvg that's pretty terse and works in the latest versions of Chrome, Firefox, Edge, and IE11.
Fiddle: https://jsfiddle.net/StefanValentin/9mudw0ts/
DOM
<svg
id="my-svg"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
version="1.1"
width="200"
height="200"
>
<rect x="10" y="10" width="50" height="50" />
<text x="0" y="100">Look, i'm cool</text>
</svg>
JavaScript
var svg = document.querySelector('#my-svg');
var data = (new XMLSerializer()).serializeToString(svg);
// We can just create a canvas element inline so you don't even need one on the DOM. Cool!
var canvas = document.createElement('canvas');
canvg(canvas, data, {
renderCallback: function() {
canvas.toBlob(function(blob) {
download('MyImageName.png', blob);
});
}
});
The download function above could be whatever you want to do, as there are many ways to trigger a download via JavaScript. Here's the one we use that works in all the browsers I've tested.
// Initiate download of blob
function download(
filename, // string
blob // Blob
) {
if (window.navigator.msSaveOrOpenBlob) {
window.navigator.msSaveBlob(blob, filename);
} else {
const elem = window.document.createElement('a');
elem.href = window.URL.createObjectURL(blob);
elem.download = filename;
document.body.appendChild(elem);
elem.click();
document.body.removeChild(elem);
}
}

Working off #CiroCosta. 1 option if you are having trouble exporting an element you could just draw the image to the canvas before drawing the svg image
btn.addEventListener('click', function () {
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var data = (new XMLSerializer()).serializeToString(svg);
var DOMURL = window.URL || window.webkitURL || window;
// get the raw image from the DOM
var rawImage = document.getElementById('yourimageID');
var img = new Image();
var svgBlob = new Blob([data], {type: 'image/svg+xml;charset=utf-8'});
var url = DOMURL.createObjectURL(svgBlob);
img.onload = function () {
ctx.drawImage(rawImage, 0, 0);
ctx.drawImage(img, 0, 0);
DOMURL.revokeObjectURL(url);
var imgURI = canvas
.toDataURL('image/png')
.replace('image/png', 'image/octet-stream');
triggerDownload(imgURI);
};
img.src = url;
});
Worked for me but only for png and jpeg. SVG files still only display inline elements and not tags
EDIT: The way you create an svg like this is actually by converting the image tag into Base64 and the setting that as the xlink:href in the image attributes like this:
<image id="crop" width="725" height="1764" xlink:href="data:image/png;base64,iVBORw0KGgo ... " />
and then triggering the download on the whole svg url like this:
btn.addEventListener('click', function () {
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var data = (new XMLSerializer()).serializeToString(svg);
var DOMURL = window.URL || window.webkitURL || window;
var rawImage = document.getElementById('yourimageID');
var img = new Image();
var svgBlob = new Blob([data], {type: 'image/svg+xml;charset=utf-8'});
var url = DOMURL.createObjectURL(svgBlob);
img.onload = function () {
ctx.drawImage(img, 0, 0);
triggerDownload(url);
DOMURL.revokeObjectURL(url);
}
};
you can convert pngs like this here:
function getDataUri(url, callback) {
var image = new Image();
image.onload = function () {
var canvas = document.createElement('canvas');
canvas.width = this.naturalWidth; // or 'width' if you want a special/scaled size
canvas.height = this.naturalHeight; // or 'height' if you want a special/scaled size
canvas.getContext('2d').drawImage(this, 0, 0);
// Get raw image data
callback(canvas.toDataURL('image/png').replace(/^data:image\/(png|jpg);base64,/, ''));
// ... or get as Data URI
callback(canvas.toDataURL('image/png'));
};
image.src = url;
}
then setting the attribute
getDataUri('localImagepath', function (dataUri) {
image.setAttribute('xlink:href', dataUri);
});

The solution for saving inline SVG as SVG file
Works in modern browsers
<svg width="100" height="100">
<rect fill="red" x="0" y="0" width="100" height="100" />
</svg>
<button>Save to SVG</button>
let btn = document.querySelector('button')
let svg = document.querySelector('svg')
let triggerDownload = (imgURI, fileName) => {
let a = document.createElement('a')
a.setAttribute('download', 'image.svg')
a.setAttribute('href', imgURI)
a.setAttribute('target', '_blank')
a.click()
}
let save = () => {
let data = (new XMLSerializer()).serializeToString(svg)
let svgBlob = new Blob([data], {type: 'image/svg+xml;charset=utf-8'})
let url = URL.createObjectURL(svgBlob)
triggerDownload(url)
}
let btn = document.querySelector('button')
btn.addEventListener('click', save)
Codepen: https://codepen.io/udovichenko/pen/yLXaWLB

The answer by #ciro costa does help, but the generated png height is not working correctly unless the canvas height and width is set.
function downloadImg() {
const svgElem = document.querySelector('svg')
const serializer = new XMLSerializer();
let svgData = serializer.serializeToString(svgElem);
svgData = '<?xml version="1.0" standalone="no"?>\r\n' + svgData;
const svgBlob = new Blob([svgData], {
type: 'image/svg+xml;charset=utf-8',
});
let DOMURL = window.URL || window.webkitURL || window;
const url = DOMURL.createObjectURL(svgBlob);
const img = new Image();
img.onload = () => {
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
const domRect = svgElem.getBBox();
canvas.width = domRect.width;
canvas.height = domRect.height;
ctx.drawImage(img, 0, 0, domRect.width, domRect.height);
DOMURL.revokeObjectURL(url);
const imgURI = canvas
.toDataURL('image/png')
.replace('image/png', 'image/octet-stream');
download(imgURI);
};
img.onerror = (e) => {
console.error('Image not loaded', e);
};
img.src = url;
}
function download(href) {
let download = document.createElement('a');
download.href = href;
download.download = 'img.png';
download.click();
download.remove();
}
<svg width="256" height="256" id="icon">
<rect class="bg1" id="bg_color_1" x="0" y="0" width="256" height="256" fill="#4cbc5a" />
</svg>
<div>
<button onclick="downloadImg()">Download</button>
</div>

In general, the solutions presented here work, but don't forget to explicitly set the canvas size in pixels, otherwise the image may be cropped.
For example:
// get the size of the svg image
const { width, height } = svg.getBBox();
// create a canvas and set its size
var canvas = document.createElement(`canvas`);
canvas.setAttribute(`width`, width);
canvas.setAttribute(`height`, height);

Use this to example, but JavaScript section is simplify to you.
function SVGPNG(svg, cb) {
let temp = document.createElement("img");
let imageSrc = URL.createObjectURL(
new Blob([svg], { type: "image/svg+xml" })
);
temp.src = imageSrc;
temp.setAttribute("style", "position:fixed;left:-200vw;");
document.body.appendChild(temp);
temp.onload = function onload() {
let canvas = document.createElement("canvas");
canvas.width = temp.clientWidth;
canvas.height = temp.clientHeight;
let ctx = canvas.getContext("2d");
ctx.drawImage(temp, 0, 0);
let src = canvas.toDataURL("image/png");
cb(src, canvas);
temp.remove();
URL.revokeObjectURL(imageSrc);
};
}
function onPaste(e) {
SVGPNG(e.target.value, (src) => {
document.getElementById("output").value = src;
});
}
body {
font-family: system-ui;
background: #f06d06;
color: white;
text-align: center;
}
textarea {
border: solid 1px #ccc;
border-radius: 10px;
resize: none;
outlined: solid 1px #999;
}
<textarea cols="60" rows="20" autofocus onchange="onPaste">Paste your SVG code here...</textarea>
<textarea cols="60" rows="20" readonly id="output">Your output here...</textarea>

Keeping it simple, place an svg, a canvas and an empty img into the HTML. Set all to the same size. The javascript will use the svg to create a binary large object which is then rendered in the canvas as a png image. The function call creates a clone of the canvas and converts it into a jpeg.
function fjpg(){
clone = c.cloneNode(true);
ctx = clone.getContext('2d');
ctx.fillStyle = "#FFF";
ctx.fillRect(0, 0, clone.width, clone.height);
ctx.drawImage(c, 0, 0);
document.all.jp1.src=clone.toDataURL("image/jpeg");
ctx = c.getContext('2d');
svgBlob = new Blob( [dataPNG], { type: 'image/svg+xml' } );
urlPNG = self.URL.createObjectURL( svgBlob );
img = new Image();
img.onload = function () {ctx.drawImage(img,0,0)}
img.src = urlPNG;
}
c = document.all.canvas0;
ctx = c.getContext('2d');
data = (new XMLSerializer()).serializeToString(document.all.svg0);
dataJPG = data.replace('>SVG<','>JPG<');
dataPNG = data.replace('>SVG<','>PNG<');
svgBlob = new Blob( [dataJPG], { type: 'image/svg+xml' } );
urlJPG = self.URL.createObjectURL( svgBlob );
img = new Image();
img.onload = function () {
ctx.drawImage( img, 0, 0 );
fjpg();
}
img.src = urlJPG;
<svg id='svg0' height=180 width=180><rect width=100% height=100% fill=red /><circle cx=90 cy=90 r=80 fill=green /><text x=90 y=105 font-size=60 text-anchor=middle fill=yellow>SVG</text></svg>
<canvas id="canvas0" height=180 width=180></canvas>
<img src='' id='jp1'>

Related

Convert an SVG to PNG using Javascript/jQuery and C# for download

I have an svg image on a page. A user then clicks a link and this is called to get the toDataUrl():
console.log('Processing svg for NOT Internet Explorer');
var svgText = $("#div-surrounding-svg-element").html();
var d3Canvas = document.getElementById("d3-canvas");
d3Canvas.width = 2000;
d3Canvas.height = 300;
var ctxt = d3Canvas.getContext("2d");
// make canvas background
ctxt.fillStyle = "#fff";
ctxt.fillRect(0, 0, d3Canvas.width, d3Canvas.height);
var svg = new Blob([svgText], { type: "image/svg+xml;charset=utf-8" });
var domURL = self.URL || self.webkitURL || self;
var url = domURL.createObjectURL(svg);
var img = new Image();
img.onload = function ()
{
ctxt.drawImage(this, 0, 0);
domURL.revokeObjectURL(url);
var dataUrl = d3Canvas.toDataURL();
// $('#download-chart-dataUrl').val(dataUrl);
// var downloadExcelForm = $('#download-chart-form');
// downloadExcelForm.submit();
// $('#download-chart-form').submit();
DownloadPNG(dataUrl);
};
img.src = url;
}
DownloadPNG does a POST to the server and C# does this:
var base64Data = Regex.Match(dataUrl, #"data:image/(?<type>.+?),(?<data>.+)").Groups["data"].Value;
var binData = Convert.FromBase64String(base64Data);
using (var stream = new MemoryStream(binData))
{
var tempFolder = ConfigurationManager.AppSettings["tempFilesDirectory"];
var bitmap = new Bitmap(stream);
var folder = Server.MapPath(tempFolder);
var imagePath = folder + $"/{Guid.NewGuid().ToString()}.png";
bitmap.Save(imagePath);
//return File(imagePath, "image/png", "Chart.png");
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment;filename=Chart.png");
Response.WriteFile(imagePath);
Response.End();
}
I am getting a plain white png instead of the image I want. What am I missing? Thanks.

You don't need any server-side for download png)))Please see an example
P.S.
Using jquery for a dom manipulation is a "bad taste" in 2k18, please use dom api))
Update: I have added querySelector to the SVG child of SVG, and SVG serializing code.
downloadPng=function(){
var img = new Image();
img.onload = function (){
var canvas = document.createElement("canvas");
canvas.width = img.naturalWidth;
canvas.height = img.naturalHeight;
var ctxt = canvas.getContext("2d");
ctxt.fillStyle = "#fff";
ctxt.fillRect(0, 0, canvas.width, canvas.height);
ctxt.drawImage(img, 0, 0);
var a = document.createElement("a");
a.href = canvas.toDataURL("image/png");
a.download = "image.png"
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
};
var innerSvg = document.querySelector("#div-surrounding-svg-element svg svg");
var svgText = (new XMLSerializer()).serializeToString(innerSvg);
img.src = "data:image/svg+xml;utf8," + encodeURIComponent(svgText);
}
<div id="div-surrounding-svg-element">
<svg id="inner-svg" height="100" width="500" xmlns="http://www.w3.org/2000/svg">
<svg height="100" width="500" xmlns="http://www.w3.org/2000/svg">
<ellipse cx="240" cy="50" rx="220" ry="30" style="fill:green" />
</svg>
<ellipse cx="240" cy="50" rx="220" ry="30" style="fill:yellow" />
</svg>
</div>
<button onclick="downloadPng()">download</button>

how to return a value with image.onload in client side [duplicate]

This question already has answers here:
How do I return the response from an asynchronous call?
(41 answers)
Closed 5 years ago.
I have tried to export the png image from svg element using Blob. Here, when i click the anchor tag the image has been exported but there is no content because of asynchronous method(image.onload()) called after complete the click event. How to resolve this problem?
<body>
<a id="export">Click To Export</a>
<div id="container" width=500px height=200px>
<svg id="myViewer" width="500px" height="200px" xmlns="http://www.w3.org/2000/svg">
<rect x="50" y="20" width="150" height="150" style="fill:blue;stroke:pink;stroke-width:5;fill-opacity:0.1;stroke-opacity:0.9"
/>
</svg>
</div>
<script>
document.getElementById('export').onclick = function () {
var tag = document.getElementById('export');
tag.download = 'Sample' + "." + 'png';
tag.href = getCanvaElement().toDataURL();
}
function getCanvaElement() {
var svgText = document.getElementById("myViewer").outerHTML;
var svg = new Blob([svgText], { type: "image/svg+xml;charset=utf-8" });
var domURL = self.URL || self.webkitURL || self;
var url = domURL.createObjectURL(svg);
var element = document.createElement('canvas');
var ctx = element.getContext("2d");
var image = new Image;
image.onload = function () {
ctx.drawImage(this, 0, 0);
domURL.revokeObjectURL(url);
};
image.src = url;
return element;
}
</script>
</body>
Sample Link: http://jsfiddle.net/kyjs655r/347/

You can use Promise constructor and async/await, resolve() <canvas> element within <img> load event
document.getElementById('export').onclick = async function() {
var tag = document.getElementById('export');
tag.download = 'Sample' + "." + 'png';
const canvas = await getCanvaElement();
tag.href = canvas.toDataURL();
}
function getCanvaElement() {
return new Promise(resolve => {
var svgText = document.getElementById("myViewer").outerHTML;
var svg = new Blob([svgText], {
type: "image/svg+xml;charset=utf-8"
});
var domURL = self.URL || self.webkitURL || self;
var url = domURL.createObjectURL(svg);
var element = document.createElement('canvas');
var ctx = element.getContext("2d");
var image = new Image;
image.onload = function() {
ctx.drawImage(this, 0, 0);
domURL.revokeObjectURL(url);
resolve(element)
};
image.src = url;
})
}
jsfiddle http://jsfiddle.net/kyjs655r/351/

Draw svg using fonts on canvas without using defs

I need to draw a svg which use external resources css in a canvas but cannot (or should not) include the style in defs since the svg will be use a lot of times in the canvas.
When I convert the SVGElement to a HTMLImageElement I loss the reference to the style.
Is it possible to obtain the render of a SVGElement in the browser and then draw it in a canvas ?
If not is there an other method to resolve my issue ?
Here is the case that I am trying to resolve:
var svgToParse = '\
<svg xmlns="http://www.w3.org/2000/svg" width="30" height="30">\
<circle cx="15" cy="15" r="14" fill="red" />\
<text class="testCss" x="50%" y="65%" text-anchor="middle"></text>\
</svg>\
';
var domParser = new DOMParser();
var svgDoc = domParser.parseFromString(svgToParse, "image/svg+xml");
var container = document.getElementById('test_container_id');
var svg1 = svgDoc.documentElement.cloneNode(true);
// Result to obtain in canvas
container.appendChild(
svg1
);
// Canvas
var DOMURL = window.URL || window.webkitURL || window;
var img = new Image();
var svg2 = new Blob([svgToParse], {type: 'image/svg+xml'});
var url = DOMURL.createObjectURL(svg2);
img.onload = function () {
document.getElementById('canvas_id')
.getContext('2d').drawImage(img, 0, 0);
DOMURL.revokeObjectURL(url);
}
img.src = url;
body {
font-family: FontAwesome;
}
.testCss {
fill: white;
}
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<div id="test_container_id">
<h3>
Needed in canvas:
</h3>
</div>
<h3>
Canvas:
</h3>
<canvas id="canvas_id" width="100" height="100">
</canvas>

AngularJS download SVG as JPG

I am trying to create a directive that will convert an SVG into a JPG/PNG.
I found this site:
http://bl.ocks.org/mbostock/6466603
So I was trying to do the same with this:
.directive('export', function () {
return {
restrict: 'A',
scope: {
target: '#export'
},
link: function (scope, element) {
// Bind to the onclick event of our button
element.bind('click', function (e) {
// Prevent the default action
e.preventDefault();
var target = document.getElementById(scope.target),
canvas = document.querySelector('canvas'),
context = canvas.getContext('2d');
console.log(target);
if (target) {
var preview = target.getElementsByTagName('svg');
console.log(preview);
var img = new Image;
img.src = preview[0];
img.onload = function () {
console.log('loaded');
};
}
});
}
};
});
The problem is the img.src. I am not sure if I am setting it right, in the example on the site above it uses a location rather than the actual svg file.
Does anyone know how I can get this to work?

A URL can actually be created from the SVG element using createObjectURL. For more information on this technique see the more general topic of Drawing DOM objects into a canvas on MDN.
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var data = document.getElementById('container').innerHTML;
var DOMURL = window.URL || window.webkitURL || window;
var img = new Image();
var svg = new Blob([data], {type: 'image/svg+xml;charset=utf-8'});
var url = DOMURL.createObjectURL(svg);
img.onload = function () {
ctx.drawImage(img, 0, 0);
DOMURL.revokeObjectURL(url);
}
img.src = url;
canvas {
border: 1px dashed red;
}
<div id="container">
<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" id="svg">
<rect width="50" height="50"></rect>
</svg>
</div>
<canvas width="200" height="200" id="canvas"></canvas>

Convert SVG to image (JPEG, PNG, etc.) in the browser

I want to convert SVG into bitmap images (like JPEG, PNG, etc.) through JavaScript.

Here is how you can do it through JavaScript:
Use the canvg JavaScript library to render the SVG image using Canvas: https://github.com/gabelerner/canvg
Capture a data URI encoded as a JPG (or PNG) from the Canvas, according to these instructions: Capture HTML Canvas as gif/jpg/png/pdf?

jbeard4 solution worked beautifully.
I'm using Raphael SketchPad to create an SVG. Link to the files in step 1.
For a Save button (id of svg is "editor", id of canvas is "canvas"):
$("#editor_save").click(function() {
// the canvg call that takes the svg xml and converts it to a canvas
canvg('canvas', $("#editor").html());
// the canvas calls to output a png
var canvas = document.getElementById("canvas");
var img = canvas.toDataURL("image/png");
// do what you want with the base64, write to screen, post to server, etc...
});

This seems to work in most browsers:
function copyStylesInline(destinationNode, sourceNode) {
var containerElements = ["svg","g"];
for (var cd = 0; cd < destinationNode.childNodes.length; cd++) {
var child = destinationNode.childNodes[cd];
if (containerElements.indexOf(child.tagName) != -1) {
copyStylesInline(child, sourceNode.childNodes[cd]);
continue;
}
var style = sourceNode.childNodes[cd].currentStyle || window.getComputedStyle(sourceNode.childNodes[cd]);
if (style == "undefined" || style == null) continue;
for (var st = 0; st < style.length; st++){
child.style.setProperty(style[st], style.getPropertyValue(style[st]));
}
}
}
function triggerDownload (imgURI, fileName) {
var evt = new MouseEvent("click", {
view: window,
bubbles: false,
cancelable: true
});
var a = document.createElement("a");
a.setAttribute("download", fileName);
a.setAttribute("href", imgURI);
a.setAttribute("target", '_blank');
a.dispatchEvent(evt);
}
function downloadSvg(svg, fileName) {
var copy = svg.cloneNode(true);
copyStylesInline(copy, svg);
var canvas = document.createElement("canvas");
var bbox = svg.getBBox();
canvas.width = bbox.width;
canvas.height = bbox.height;
var ctx = canvas.getContext("2d");
ctx.clearRect(0, 0, bbox.width, bbox.height);
var data = (new XMLSerializer()).serializeToString(copy);
var DOMURL = window.URL || window.webkitURL || window;
var img = new Image();
var svgBlob = new Blob([data], {type: "image/svg+xml;charset=utf-8"});
var url = DOMURL.createObjectURL(svgBlob);
img.onload = function () {
ctx.drawImage(img, 0, 0);
DOMURL.revokeObjectURL(url);
if (typeof navigator !== "undefined" && navigator.msSaveOrOpenBlob)
{
var blob = canvas.msToBlob();
navigator.msSaveOrOpenBlob(blob, fileName);
}
else {
var imgURI = canvas
.toDataURL("image/png")
.replace("image/png", "image/octet-stream");
triggerDownload(imgURI, fileName);
}
document.removeChild(canvas);
};
img.src = url;
}

The solution to convert SVG to blob URL and blob URL to png image
const svg=`<svg version="1.1" baseProfile="full" width="300" height="200"
xmlns="http://www.w3.org/2000/svg">
<rect width="100%" height="100%" fill="red" />
<circle cx="150" cy="100" r="80" fill="green" />
<text x="150" y="125" font-size="60" text-anchor="middle" fill="white">SVG</text></svg>`
svgToPng(svg,(imgData)=>{
const pngImage = document.createElement('img');
document.body.appendChild(pngImage);
pngImage.src=imgData;
});
function svgToPng(svg, callback) {
const url = getSvgUrl(svg);
svgUrlToPng(url, (imgData) => {
callback(imgData);
URL.revokeObjectURL(url);
});
}
function getSvgUrl(svg) {
return URL.createObjectURL(new Blob([svg], { type: 'image/svg+xml' }));
}
function svgUrlToPng(svgUrl, callback) {
const svgImage = document.createElement('img');
// imgPreview.style.position = 'absolute';
// imgPreview.style.top = '-9999px';
document.body.appendChild(svgImage);
svgImage.onload = function () {
const canvas = document.createElement('canvas');
canvas.width = svgImage.clientWidth;
canvas.height = svgImage.clientHeight;
const canvasCtx = canvas.getContext('2d');
canvasCtx.drawImage(svgImage, 0, 0);
const imgData = canvas.toDataURL('image/png');
callback(imgData);
// document.body.removeChild(imgPreview);
};
svgImage.src = svgUrl;
}

change svg to match your element
function svg2img(){
var svg = document.querySelector('svg');
var xml = new XMLSerializer().serializeToString(svg);
var svg64 = btoa(xml); //for utf8: btoa(unescape(encodeURIComponent(xml)))
var b64start = 'data:image/svg+xml;base64,';
var image64 = b64start + svg64;
return image64;
};svg2img()

My use case was to have the svg data loaded from a network and this ES6 Class did the Job.
class SvgToPngConverter {
constructor() {
this._init = this._init.bind(this);
this._cleanUp = this._cleanUp.bind(this);
this.convertFromInput = this.convertFromInput.bind(this);
}
_init() {
this.canvas = document.createElement("canvas");
this.imgPreview = document.createElement("img");
this.imgPreview.style = "position: absolute; top: -9999px";
document.body.appendChild(this.imgPreview);
this.canvasCtx = this.canvas.getContext("2d");
}
_cleanUp() {
document.body.removeChild(this.imgPreview);
}
convertFromInput(input, callback) {
this._init();
let _this = this;
this.imgPreview.onload = function() {
const img = new Image();
_this.canvas.width = _this.imgPreview.clientWidth;
_this.canvas.height = _this.imgPreview.clientHeight;
img.crossOrigin = "anonymous";
img.src = _this.imgPreview.src;
img.onload = function() {
_this.canvasCtx.drawImage(img, 0, 0);
let imgData = _this.canvas.toDataURL("image/png");
if(typeof callback == "function"){
callback(imgData)
}
_this._cleanUp();
};
};
this.imgPreview.src = input;
}
}
Here is how you use it
let input = "https://restcountries.eu/data/afg.svg"
new SvgToPngConverter().convertFromInput(input, function(imgData){
// You now have your png data in base64 (imgData).
// Do what ever you wish with it here.
});
If you want a vanilla JavaScript version, you could head over to Babel website and transpile the code there.

Here a function that works without libraries and returns a Promise:
/**
* converts a base64 encoded data url SVG image to a PNG image
* #param originalBase64 data url of svg image
* #param width target width in pixel of PNG image
* #return {Promise<String>} resolves to png data url of the image
*/
function base64SvgToBase64Png (originalBase64, width) {
return new Promise(resolve => {
let img = document.createElement('img');
img.onload = function () {
document.body.appendChild(img);
let canvas = document.createElement("canvas");
let ratio = (img.clientWidth / img.clientHeight) || 1;
document.body.removeChild(img);
canvas.width = width;
canvas.height = width / ratio;
let ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
try {
let data = canvas.toDataURL('image/png');
resolve(data);
} catch (e) {
resolve(null);
}
};
img.onerror = function() {
resolve(null);
};
img.src = originalBase64;
});
}
On Firefox there is an issue for SVGs without set width / height.
See this working example including a fix for the Firefox issue.

This is an old question, in 2022 we have ES6 and we don't need 3rd party libraries.
Here is a very basic way to convert svg images into other formats.
The trick is to load the svg element as an img element, then use a canvas element to convert the image into the desired format. So, four steps are needed:
Extract svg as xml data string.
Load the xml data string into a img element
Convert the img element to a dataURL using a canvas element
Load the converted dataURL into a new img element
Step 1
Extracting a svg as xml data string is simple, we don't need to convert it as a base64 string. We just serialize it as XML then we encode the string as a URI:
// Select the element:
const $svg = document.getElementById('svg-container').querySelector('svg')
// Serialize it as xml string:
const svgAsXML = (new XMLSerializer()).serializeToString($svg)
// Encode it as a data string:
const svgData = `data:image/svg+xml,${encodeURIComponent(svgAsXML)}`
Step 2
Loading the xml data string into a img element:
// This function returns a Promise whenever the $img is loaded
const loadImage = async url => {
const $img = document.createElement('img')
$img.src = url
return new Promise((resolve, reject) => {
$img.onload = () => resolve($img)
$img.onerror = reject
$img.src = url
})
}
Step 3
Converting the img element to a dataURL using a canvas element:
const $canvas = document.createElement('canvas')
$canvas.width = $svg.clientWidth
$canvas.height = $svg.clientHeight
$canvas.getContext('2d').drawImage(img, 0, 0, $svg.clientWidth, $svg.clientHeight)
return $canvas.toDataURL(`image/${format}`, 1.0)
Step 4
Loading the converted dataURL into a new img element:
const $img = document.createElement('img')
$img.src = dataURL
$holder.appendChild($img)
Here you have a working snippet:
const $svg = document.getElementById('svg-container').querySelector('svg')
const $holder = document.getElementById('img-container')
const $label = document.getElementById('img-format')
const destroyChildren = $element => {
while ($element.firstChild) {
const $lastChild = $element.lastChild ?? false
if ($lastChild) $element.removeChild($lastChild)
}
}
const loadImage = async url => {
const $img = document.createElement('img')
$img.src = url
return new Promise((resolve, reject) => {
$img.onload = () => resolve($img)
$img.onerror = reject
})
}
const convertSVGtoImg = async e => {
const $btn = e.target
const format = $btn.dataset.format ?? 'png'
$label.textContent = format
destroyChildren($holder)
const svgAsXML = (new XMLSerializer()).serializeToString($svg)
const svgData = `data:image/svg+xml,${encodeURIComponent(svgAsXML)}`
const img = await loadImage(svgData)
const $canvas = document.createElement('canvas')
$canvas.width = $svg.clientWidth
$canvas.height = $svg.clientHeight
$canvas.getContext('2d').drawImage(img, 0, 0, $svg.clientWidth, $svg.clientHeight)
const dataURL = await $canvas.toDataURL(`image/${format}`, 1.0)
console.log(dataURL)
const $img = document.createElement('img')
$img.src = dataURL
$holder.appendChild($img)
}
const buttons = [...document.querySelectorAll('[data-format]')]
for (const $btn of buttons) {
$btn.onclick = convertSVGtoImg
}
.wrapper {
display: flex;
flex-flow: row nowrap;
width: 100vw;
}
.images {
display: flex;
flex-flow: row nowrap;
width: 70%;
}
.image {
width: 50%;
display: flex;
flex-flow: row wrap;
justify-content: center;
}
.label {
width: 100%;
text-align: center;
}
<div class="wrapper">
<div class="item images">
<div class="image left">
<div class="label">svg</div>
<div id="svg-container">
<svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" width="200" height="200" viewBox="0 0 248 204">
<path fill="#1d9bf0" d="M221.95 51.29c.15 2.17.15 4.34.15 6.53 0 66.73-50.8 143.69-143.69 143.69v-.04c-27.44.04-54.31-7.82-77.41-22.64 3.99.48 8 .72 12.02.73 22.74.02 44.83-7.61 62.72-21.66-21.61-.41-40.56-14.5-47.18-35.07 7.57 1.46 15.37 1.16 22.8-.87-23.56-4.76-40.51-25.46-40.51-49.5v-.64c7.02 3.91 14.88 6.08 22.92 6.32C11.58 63.31 4.74 33.79 18.14 10.71c25.64 31.55 63.47 50.73 104.08 52.76-4.07-17.54 1.49-35.92 14.61-48.25 20.34-19.12 52.33-18.14 71.45 2.19 11.31-2.23 22.15-6.38 32.07-12.26-3.77 11.69-11.66 21.62-22.2 27.93 10.01-1.18 19.79-3.86 29-7.95-6.78 10.16-15.32 19.01-25.2 26.16z"/>
</svg>
</div>
</div>
<div class="image right">
<div id="img-format" class="label"></div>
<div id="img-container"></div>
</div>
</div>
<div class="item buttons">
<button id="btn-png" data-format="png">PNG</button>
<button id="btn-jpg" data-format="jpeg">JPG</button>
<button id="btn-webp" data-format="webp">WEBP</button>
</div>
</div>

Svg to png can be converted depending on conditions:
If svg is in format SVG (string) paths:
create canvas
create new Path2D() and set svg as parameter
draw path on canvas
create image and use canvas.toDataURL() as src.
example:
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
let svgText = 'M10 10 h 80 v 80 h -80 Z';
let p = new Path2D('M10 10 h 80 v 80 h -80 Z');
ctx.stroke(p);
let url = canvas.toDataURL();
const img = new Image();
img.src = url;
Note that Path2D not supported in ie and partially supported in edge. Polyfill solves that:
https://github.com/nilzona/path2d-polyfill
Create svg blob and draw on canvas using .drawImage():
make canvas element
make a svgBlob object from the svg xml
make a url object from domUrl.createObjectURL(svgBlob);
create an Image object and assign url to image src
draw image into canvas
get png data string from canvas: canvas.toDataURL();
Nice description:
https://web.archive.org/web/20200125162931/http://ramblings.mcpher.com:80/Home/excelquirks/gassnips/svgtopng
Note that in ie you will get exception on stage of canvas.toDataURL(); It is because IE has too high security restriction and treats canvas as readonly after drawing image there. All other browsers restrict only if image is cross origin.
Use canvg JavaScript library. It is separate library but has useful functions.
Like:
ctx.drawSvg(rawSvg);
var dataURL = canvas.toDataURL();

I recently discovered a couple of image tracing libraries for JavaScript that indeed are able to build an acceptable approximation to the bitmap, both size and quality. I'm developing this JavaScript library and CLI :
https://www.npmjs.com/package/svg-png-converter
Which provides unified API for all of them, supporting browser and node, non depending on DOM, and a Command line tool.
For converting logos/cartoon/like images it does excellent job. For photos / realism some tweaking is needed since the output size can grow a lot.
It has a playground although right now I'm working on a better one, easier to use, since more features has been added:
https://cancerberosgx.github.io/demos/svg-png-converter/playground/#

There are several ways to convert SVG to PNG using the Canvg library.
In my case, I needed to get the PNG blob from inline SVG.
The library documentation provides an example (see OffscreenCanvas example).
But this method does not work at the moment in Firefox. Yes, you can enable the gfx.offscreencanvas.enabled option in the settings. But will every user on the site do this? :)
However, there is another way that will work in Firefox too.
const el = document.getElementById("some-svg"); //this is our inline SVG
var canvas = document.createElement('canvas'); //create a canvas for the SVG render
canvas.width = el.clientWidth; //set canvas sizes
canvas.height = el.clientHeight;
const svg = new XMLSerializer().serializeToString(el); //convert SVG to string
//render SVG inside canvas
const ctx = canvas.getContext('2d');
const v = await Canvg.fromString(ctx, svg);
await v.render();
let canvasBlob = await new Promise(resolve => canvas.toBlob(resolve));
For the last line thanks to this answer

get data URIs from SVG:
data:image/svg+xml;base64,${btoa(new XMLSerializer().serializeToString(svgElem))}
prepare an Image
create a canvas and use toDataURL to export.
Example
<!-- test data-->
<svg width="400" height="400"><g transform="translate(23.915343915343925,-80.03971756398937)" class="glyph" stroke="#000000" fill="#a0a0a0"><path d="M74.97 108.70L74.97 108.70L100.08 110.77Q93.89 147.91 87.35 179.89L87.35 179.89L148.23 179.89L148.23 194.34Q143.76 277.91 113.84 339.81L113.84 339.81Q144.44 363.54 163.70 382.46L163.70 382.46L146.51 402.75Q128.62 384.18 101.80 361.83L101.80 361.83Q75.32 405.85 34.39 436.80L34.39 436.80L17.20 415.82Q57.43 386.93 82.20 345.66L82.20 345.66Q57.78 326.40 27.86 304.39L27.86 304.39Q44.37 257.96 56.75 203.97L56.75 203.97L19.26 203.97L19.26 179.89L61.90 179.89Q69.47 145.16 74.97 108.70ZM93.20 323.99L93.20 323.99Q118.65 272.06 123.12 203.97L123.12 203.97L82.20 203.97Q69.47 260.03 55.71 297.17L55.71 297.17Q76.01 311.61 93.20 323.99ZM160.26 285.13L160.26 260.37L239.71 260.37L239.71 216.01Q268.25 191.24 294.05 155.48L294.05 155.48L170.58 155.48L170.58 130.71L322.94 130.71L322.94 155.48Q297.49 191.93 265.50 223.92L265.50 223.92L265.50 260.37L337.38 260.37L337.38 285.13L265.50 285.13L265.50 397.59Q265.50 431.64 237.65 431.64L237.65 431.64L187.09 431.64L180.21 407.57Q202.22 407.91 227.67 407.91L227.67 407.91Q239.71 407.91 239.71 390.03L239.71 390.03L239.71 285.13L160.26 285.13Z"></path></g></svg>
<button title="download">svg2png</button>
<script>
const output = {"name": "result.png", "width": 64, "height": 64}
document.querySelector("button").onclick = () => {
const svgElem = document.querySelector("svg")
// const uriData = `data:image/svg+xml;base64,${btoa(svgElem.outerHTML)}` // it may fail.
const uriData = `data:image/svg+xml;base64,${btoa(new XMLSerializer().serializeToString(svgElem))}`
const img = new Image()
img.src = uriData
img.onload = () => {
const canvas = document.createElement("canvas");
[canvas.width, canvas.height] = [output.width, output.height]
const ctx = canvas.getContext("2d")
ctx.drawImage(img, 0, 0, output.width, output.height)
// 👇 download
const a = document.createElement("a")
const quality = 1.0 // https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/imageSmoothingQuality
a.href = canvas.toDataURL("image/png", quality)
a.download = output.name
a.append(canvas)
a.click()
a.remove()
}
}
</script>

Here are my 2 cents. Somehow Download anchor tag is not working as expected in code snippet, however it was working fine in Chrome.
Here is working jsFiddle
const waitForImage = imgElem => new Promise(resolve => imgElem.complete ? resolve() : imgElem.onload = imgElem.onerror = resolve);
const svgToImgDownload = ext => {
if (!['png', 'jpg', 'webp'].includes(ext))
return;
const _svg = document.querySelector("#svg_container").querySelector('svg');
const xmlSerializer = new XMLSerializer();
let _svgStr = xmlSerializer.serializeToString(_svg);
const img = document.createElement('img');
img.src = 'data:image/svg+xml;base64,' + window.btoa(_svgStr);
waitForImage(img)
.then(_ => {
const canvas = document.createElement('canvas');
canvas.width = _svg.clientWidth;
canvas.height = _svg.clientHeight;
canvas.getContext('2d').drawImage(img, 0, 0, _svg.clientWidth, _svg.clientHeight);
return canvas.toDataURL('image/' + (ext == 'jpg' ? 'jpeg' : ext), 1.0);
})
.then(dataURL => {
console.log(dataURL);
document.querySelector("#img_download_btn").innerHTML = `Download`;
})
.catch(console.error);
};
document.querySelector('#map2Png').addEventListener('click', _ => svgToImgDownload('png'));
document.querySelector('#map2Jpg').addEventListener('click', _ => svgToImgDownload('jpg'));
document.querySelector('#map2Webp').addEventListener('click', _ => svgToImgDownload('webp'));
<div id="svg_container" style="float: left; width: 50%">
<svg width="200" height="200" viewBox="-100 -100 200 200">
<circle cx="0" cy="20" r="70" fill="#D1495B" />
<circle cx="0" cy="-75" r="12" fill="none" stroke="#F79257" stroke-width="2" />
<rect x="-17.5" y="-65" width="35" height="20" fill="#F79257" />
</svg>
</div>
<div>
<button id="map2Png">PNG</button>
<button id="map2Jpg">JPG</button>
<button id="map2Webp">WEBP</button>
</div>
<div id="img_download_btn"></div>

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