Convert SVG to image (JPEG, PNG, etc.) in the browser
JavascriptSvgJavascript Problem Overview
I want to convert SVG into bitmap images (like JPEG, PNG, etc.) through JavaScript.
Javascript Solutions
Solution 1 - 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: https://stackoverflow.com/questions/923885/capture-html-canvas-as-gif-jpg-png-pdf/3514404#3514404
Solution 2 - Javascript
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...
});
Solution 3 - Javascript
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;
}
Solution 4 - Javascript
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;
}
Solution 5 - Javascript
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.
Solution 6 - Javascript
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()
Solution 7 - Javascript
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.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.
Solution 8 - Javascript
Svg
to png
can be converted depending on conditions:
- If
svg
is in format SVG (string) paths:
- create canvas
- create
new Path2D()
and setsvg
as parameter - draw path on canvas
- create image and use
canvas.toDataURL()
assrc
.
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();
Solution 9 - Javascript
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/#
Solution 10 - Javascript
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