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

Question

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

Golliner

What task is it that you actually want to accomplish? Even though echo-flows answer tell us that it is (in some browsers) possible there are better and easier conversion methods for almost all practical cases. – Firstly

Here's an example using d3: https://mcmap.net/q/67402/-svg-to-canvas-with-d3-js – Textualist

svgopen.org/2010/papers/62-From_SVG_to_Canvas_and_Back - Works perfectly! [On the link page, sourceSVG = $("#your_svg_elem_name").get(0) ] – Besetting

related: #3173548 – Cas

mybyways.com/blog/convert-svg-to-png-using-your-browser – Mucin

Does this answer your question? Capture HTML Canvas as gif/jpg/png/pdf? – Lunik

Try sitelint.com/blog/… – Macon

Answer 1

Here is how you can do it through JavaScript:

1. Use the canvg JavaScript library to render the SVG image using Canvas: https://github.com/gabelerner/canvg
2. 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?

Filigree

This isn't strictly Javascript, but HTML5 as well. This will not work on IE8, or any other browser that does not support HTML5 Canvas. – Conclude

Thanks for not supporting IE8. People should understand that it's time to move on. – Curriculum

You can now use the JavaScript SVG library Pablo to achieve this (I made it). See the toImage() and also download() for an auto-downloaded image. – Disconsolate

@Premasagar how did you do this? All I can get is empty svg file – Urina

canvg is incomplete. e.g. it doesn't support masks. – Matrass

@Premasagar Unfortunately the link doesn't work, but your comment sounds very interesting. – Commodus

@Matrass is right. this solutions doesn't work with masks. did you get with solution with masks? – Clamp

Note that in late 2022 (and beyond) step 1 is entirely unnecessary. Just draw the SVG onto a canvas, no third party libraries required, then use toDataURL. – Maledict

Answer 2

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...
});

Selfwinding

canvg need the second parameter to be <svg>...</svg but jquery html() function don't add svg tag, so this code works for me but I needed to edit the canvg live to canvg('canvas', '<svg>'+$("#editor").html()+'</svg>'); – Phosphocreatine

@Phosphocreatine if you call $(selector).html() on the parent of your svg element, it will work – Boatright

@Phosphocreatine and @jonathanGB, you shouldn't have to use html() on wrappers, or manually construct the parent svg tag -- which might even have attributes you leave out with this hack. Just use $(svg_elem)[0].outerHTML gives you the full source of the svg and its contents. Just saying... – Keli

Answer 3

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;
}

Antemundane

This is not working in IE11, because of the security issue with .msToBlob() – Selfsustaining

Thanks!! I love how this works for both a "local" SVG HTML node and a remote SVG URL. Plus it doesn't require a full external library – Em

Could you provide a usage example? – Gynaeco

This copyStylesInline helped me a lot!! Without adding that, my exported png was looking very weird. Thank you! – Carden

I have an issue with using SVGAnimateElement (since animations do not affect the style of the SVG), did someone else encounter it? – Soloist

Answer 4

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;
 }

Halfcaste

This solution does not work for complex SVG (e.g. patterns with images) – Peyton

Here is your code but optimized, but thank you for that... codepen.io/arcaelas-the-looper/pen/wvrqzvm – Seedling

Thanks you @AlejandroReyes – Natalianatalie

You are welcome, u can followme in github: arcaelas – Seedling

For some reason, when I used URL.createObjectURL(new Blob([svg], { type: 'image/svg+xml' })), some SVGs got tainted (I suspect it has todo with that they have \<style\>s defined in them), but then I tried creating data urls from scratch like so: 'data:image/svg+xml;utf-8,${svg.replace(/#/g, '%23').replace(/\n/g, '%0A')}';, which worked flawlessly! You could also use base64 like this: 'data:image/svg+xml;base64,${btoa(drawing)}';. I am using electron – Tippler

Answer 5

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:

1. Extract svg as xml data string.
2. Load the xml data string into a img element
3. Convert the img element to a dataURL using a canvas element
4. 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:

// Data header for a svg image: 
const dataHeader = 'data:image/svg+xml;charset=utf-8'

// Serialize it as xml string:
const serializeAsXML = $e => (new XMLSerializer()).serializeToString($e)

// Encode URI data as UTF8 data:
const encodeAsUTF8 = s => `${dataHeader},${encodeURIComponent(s)}`

// Select the element:
const $svg = document.getElementById('svg-container').querySelector('svg')

// Encode it as a data string:
const svgData = encodeAsUTF8(serializeAsXML($svg))

Note:

If you need a base64 data you can use this option:

...

// Encode URI data as base64 data:
const encodeAsB64 = s => `${dataHeader};base64,${btoa(s)}`
...

// Encode it as a data string:
const svgData = encodeAsB64(serializeAsXML($svg))

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 dataHeader = 'data:image/svg+xml;charset=utf-8'
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 serializeAsXML = $e => (new XMLSerializer()).serializeToString($e)

const encodeAsUTF8 = s => `${dataHeader},${encodeURIComponent(s)}`
const encodeAsB64 = s => `${dataHeader};base64,${btoa(s)}`

const convertSVGtoImg = async e => {
  const $btn = e.target
  const format = $btn.dataset.format ?? 'png'
  $label.textContent = format

  destroyChildren($holder)

  const svgData = encodeAsUTF8(serializeAsXML($svg))

  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>

Nonconformist

in step 2 you are setting the img.src twice, I believe the second one is sufficient – Conakry

the image in the step 2 still contains a data:image/svg+xml image we use the canvas to convert it into another format (i.e. png, jpeg, ...) If in your case the step 2 is enough great. I presented a complete solution for everybody. – Nonconformist

Answer 6

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()

Afterword

it's not working for me, i get this error: Uncaught TypeError: Failed to execute 'serializeToString' on 'XMLSerializer': parameter 1 is not of type 'Node'. – Pledge

@Pledge try to Switch the DOMParser interface developer.mozilla.org/en-US/docs/Web/API/DOMParser – Afterword

Thanks, this works for me. No need to use external library. – Daglock

@MahdiKhalili how? – Bohi

@RyanArqueza what how? – Afterword

when should I care about utf8? – Lashawnda

@MTZ you should consider using utf8 part for utf8 characters for example your SVG contains non ASCI characters – Afterword

Answer 7

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.

Herold

Answer 8

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.

Alto

Didn't work for me in Safari, just hung, no error – Gynaecomastia

Thanks for testing, I didn't test with Safari before. So there is also no error in the Javascript console, which would be strange? – Alto

Yes, very odd in my experience, but I didn't have more time to waste on it unfortunately – Gynaecomastia

Thanks for including that fantastic example! – Causative

1) I suggest attaching to img.onerror also to not risk stalling the Promise in that case. 2) you don't have to attach the image to the document.body. – Convolvulus

@FredrikBlomqvist: (1) correct, I've added it. (2) Yes, I do have to attach it to body, in order to get the correct image ratio, see example with rectangular image and see the difference if you remove adding it to body: jsfiddle.net/3kba4gh9 (tested in current FF) – Alto

@Alto hmm, but why do you need to use img.clientWidth? If you use img.naturalWidth or img.width it works without attaching to DOM. – Convolvulus

Answer 9

Svg to png can be converted depending on conditions:

1. 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

2. 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.

3. Use canvg JavaScript library. It is separate library but has useful functions.

Like:

ctx.drawSvg(rawSvg);
var dataURL = canvas.toDataURL();

Arnuad

3rd link is broken – Prefecture

yes, indeed. I don't know how to reach there now. But description above can be enough for some understanding. Good idea for future co copy some context after the reference – Arnuad

fixed linkrot. the wayback machine is your friend for fixing linkrot. – Tallinn

Answer 10

1. get data URIs from SVG:

   data:image/svg+xml;base64,${btoa(new XMLSerializer().serializeToString(svgElem))}

2. prepare an Image
3. 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>

Lunik

Answer 11

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/#

Christianachristiane

Answer 12

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

Tensity

Answer 13

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 = `<a href="${dataURL}" download="img.${ext}">Download</a>`;
    })
    .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>

Antinomy

if (!['jpg'].includes(ext)) return and ext == 'jpg' ? 'jpeg' will never reach if someone uses jpeg, guessing you meant ['png','jpg','jpeg','webp'] – Chromoplast

Answer 14

If the goal is to convert an SVG file to a PNG image file via a browser, maybe the following website can help for those who need it quickly :

https://mybyways.com/blog/convert-svg-to-png-using-your-browser

Enter the SVG code in this section, then click the Load SVG button

A preview of the SVG image will appear and can be downloaded or saved as a PNG image file by pressing the Save SVG as PNG button.

Prepossessing