FreeSewing in the browser

Thanks to the advances in browser standardisation around JavaScript ESM modules, not to mention the new Skypack CDN, you can generate patterns in the browser with a few lines of JavaScript.

Use if you just want a pattern

These instructions are intended for people who want to generate their own patterns using FreeSewing packages. If you just want a sewing pattern created for you, you can get all our designs on, our website for makers.

High level overview

To generate a pattern, you will need to:

  • Instantiate the pattern (new ...)
  • Pass it the settings and measurements you want to use ({ ... })
  • Load the theme plugin (using use())
  • Draft the pattern (using draft())
  • Render it to SVG (using render())

Which can be done as a one-liner since use(), draft() and render() are all chainable, as shown below.

Code example

Below is a complete example.

    <!-- This entire head tag is optional/cosmetic -->
    <title>FreeSewing browser example</title>
      body {
        font-size: 24px;
        padding: 1rem;
      svg {
        max-width: calc(100vw - 4rem);
        max-height: calc(100vh - 4rem);
        margin: 0 auto;
      #container {
        text-align: center;
    <script type="module">
      import { Aaron } from '';
      import { pluginTheme as theme } from '';
      const svg = new Aaron({
        sa: 10, // Seam allowance
        paperless: true, // Enable paperless mode
        // More settings, see:
        measurements: { // Pass in measurements
          biceps: 387,
          chest: 1105,
          hips: 928,
          hpsToWaistBack: 502,
          neck: 420,
          shoulderSlope: 13,
          shoulderToShoulder: 481,
          waistToHips: 139,
      .use(theme) // Load theme plugin
      .draft() // Draft the pattern
      .render() // Render to SVG
      // Update DOM
      document.getElementById("container").innerHTML = svg
    <div id='container'>SVG output will appear here</div>


If you compare this example with our Node.js example you’ll notice that you do not need to worry about loading any dependencies. Not even @freesewing/core is loaded, because Skypack will pull in all dependencies for you.