SVG to Image: https://remarkablemark.org/blog/2020/12/30/svg-to-image/

index.html

<link rel="stylesheet" href="style.css">

<h1>SVG to Image</h1>

<!--
  Load SVG.
-->
<form id="load-svg">
  <p>
    <textarea
      placeholder="SVG markup..."
      rows="5"
      cols="50"
      autofocus
      required
    ></textarea>
  </p>

  <button type="submit">
    Load SVG
  </button>
</form>

<!--
  SVG container.
-->
<p>
  <div id="svg-container"></div>
</p>
<hr>

<!--
  Save image.
-->
<form id="save-image">
  <p>
    <label>
      Width:
      <input
        placeholder="Pixels..."
        name="width"
        type="number"
        min="1"
        max="999999"
        required
      >
    </label>&nbsp;
    <label>
      Height:
      <input
        placeholder="Pixels..."
        name="height"
        type="number"
        min="1"
        max="999999"
        required
      >
    </label>
  </p>

  <p>
    <label>
      Filename:
      <input
        placeholder="Name without extension..."
        name="filename"
        size="25"
        required
      >
    </label>
  </p>

  <p>
    Extension:
    <label>
      <input type="radio" name="extension" value="png" checked>PNG
    </label>&nbsp;
    <label>
      <input type="radio" name="extension" value="jpeg">JPEG
    </label>
  </p>

  <p>
    <button type="submit">Save Image</button>
  </p>
</form>

<canvas></canvas>
<a id="download-link"></a>

<script src="script.js"></script>

script.js

/**
 * Elements.
 */
var textarea= document.querySelector('textarea');
var svgContainer = document.querySelector('#svg-container');

var loadSVGForm = document.querySelector('#load-svg');
var saveImageForm = document.querySelector('#save-image');

var loadButton = loadSVGForm.querySelector('button');
var saveButton = saveImageForm.querySelector('button');

var widthInput = saveImageForm.elements.width;
var heightInput = saveImageForm.elements.height;
var filenameInput = saveImageForm.elements.filename;

var canvas = document.querySelector('canvas');
var downloadLink = document.querySelector('#download-link');

var svg;

/**
 * Resizes SVG element.
 *
 * @param {object} dimensions
 * @param {number} [dimensions.width]
 * @param {number} [dimensions.height]
 */
function resizeSVG(dimensions) {
  if (!svg) {
    return
  }

  if (dimensions.width) {
    svg.setAttribute('width', dimensions.width);
  }

  if (dimensions.height) {
    svg.setAttribute('height', dimensions.height);
  }
}

/**
 * Load SVG.
 */
loadSVGForm.addEventListener('submit', function loadSVG(event) {
  event.preventDefault();

  svgContainer.innerHTML= textarea.value;
  svg = svgContainer.querySelector('svg');

  widthInput.value = svg.clientWidth || svg.getBoundingClientRect().width;
  heightInput.value = svg.clientHeight || svg.getBoundingClientRect().height;
  filenameInput.value = svg.getAttribute('aria-label') || svg.id || 'untitled';
});

/**
 * Resize SVG.
 */
widthInput.addEventListener('input', function(event) {
  resizeSVG({ width: event.target.value });
});

heightInput.addEventListener('input', function(event) {
  resizeSVG({ height: event.target.value });
});

/**
 * Save image.
 */
saveImageForm.addEventListener('submit', function saveImage(event) {
  event.preventDefault();

  var width = widthInput.value;
  var height = heightInput.value;
  resizeSVG({
    width: width,
    height: height
  });
  canvas.width = width;
  canvas.height = height;

  var xml = new XMLSerializer().serializeToString(svg);
  var img = new Image();
  var blob = new Blob([xml], { type: 'image/svg+xml' });
  var url = URL.createObjectURL(blob);
  window.form = event.target;

  img.addEventListener('load', function drawImageAndDownload() {
    URL.revokeObjectURL(url);
    canvas.getContext('2d').drawImage(img, 0, 0);
    var extension = saveImageForm.elements.extension.value;
    var mimeType = 'image/' + extension;
    var uri = canvas.toDataURL(mimeType).replace(mimeType, 'octet/stream');
    downloadLink.href = uri;
    downloadLink.download = filenameInput.value + '.' + extension;
    downloadLink.click();
    // cleanup
    URL.revokeObjectURL(uri);
    img.removeEventListener('load', drawImageAndDownload);
  });

  img.src = url;
});

style.css

body {
  font-family: "Lucida Grande", Helvetica, Arial, sans-serif;
}

#download-link {
  display: none;
}