To convert SVG into PNG in the browser, you can use the Resvg-js wasm module.
Setting up the project
- Create an
index.htmlfile and fetchresvg-wasmmodule.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<img id="output">
<script src="https://unpkg.com/@resvg/resvg-wasm"></script>
</body>
</html>
- Create an
index.jsfile and link it to theindex.htmlfile.
<script type="module" src="./index.js"></script>
Working with Resvg-wasm
Inside the index.js file, I am using an IFEE function expression. You can also add some event handlers to invoke javascript functions. But for simplicity, the code inside index.js will run immediately when the page loads.
- First, initialize the
resvg-wasmmodule using theinitWasmmethod.
await resvg.initWasm(
fetch("https://unpkg.com/@resvg/resvg-wasm/index_bg.wasm")
);
- Now defining some options. You can check out for more options in the documentation.
const opts = {
fitTo: {
mode: "width", // If you need to change the size
value: 800,
},
};
- This is the final part. Convert an SVG image into a PNG image using
resvg-wasm
const svg ='<svg>...</svg>'; // Input SVG, String or Uint8Array
const resvgJS = new resvg.Resvg(svg, opts);
const pngData = resvgJS.render(svg, opts); // Output PNG data, Uint8Array
const pngBuffer = pngData.asPng();
const pngURL = URL.createObjectURL(
new Blob([pngBuffer], { type: "image/png" })
);
document.getElementById("output").src = pngURL;
- Wrap the code inside an IFEE to invoke immediately on page load.
(async function () {
await resvg.initWasm(
fetch("https://unpkg.com/@resvg/resvg-wasm/index_bg.wasm")
);
const opts = {
fitTo: {
mode: "width", // If you need to change the size
value: 800,
},
};
const svg ='<svg>...</svg>'; // Input SVG, String or Uint8Array
const resvgJS = new resvg.Resvg(svg, opts);
const pngData = resvgJS.render(svg, opts); // Output PNG data, Uint8Array
const pngBuffer = pngData.asPng();
const pngURL = URL.createObjectURL(
new Blob([pngBuffer], { type: "image/png" })
);
document.getElementById("output").src = pngURL;
})();
Further read:
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