Font Optimization

By default, Blitz.js will automatically inline font CSS at build time, eliminating an extra round trip to fetch font declarations. This results in improvements to First Contentful Paint (FCP) and Largest Contentful Paint (LCP).

For example:

// Before
<link
  href="https://fonts.googleapis.com/css2?family=Inter"
  rel="stylesheet"
/>

// After
<style data-href="https://fonts.googleapis.com/css2?family=Inter">
  @font-face{font-family:'Inter';font-style:normal...
</style>

Usage

To add a web font to your Blitz.js application, use <Head>. You can add a font to a specific page like this:

// pages/index.js

import { Head } from "blitz"

export default function IndexPage() {
  return (
    <div>
      <Head>
        <link
          href="https://fonts.googleapis.com/css2?family=Inter"
          rel="stylesheet"
        />
      </Head>
      <p>Hello world!</p>
    </div>
  )
}

or to your entire application with a Custom Document.

// pages/_document.js

import { Document, Html, DocumentHead, Main, BlitzScript } from "blitz"

class MyDocument extends Document {
  render() {
    return (
      <Html>
        <DocumentHead>
          <link
            href="https://fonts.googleapis.com/css2?family=Inter"
            rel="stylesheet"
          />
        </DocumentHead>
        <body>
          <Main />
          <BlitzScript />
        </body>
      </Html>
    )
  }
}

export default MyDocument

Automatic Webfont Optimization currently supports Google Fonts and Typekit with support for other font providers coming soon. We're also planning to add control over loading strategies and font-display values.

Disabling Optimization

If you do not want Blitz.js to optimize your fonts, you can opt-out.

// blitz.config.js

module.exports = {
  optimizeFonts: false,
}

Font Optimization

Topics

Usage

Disabling Optimization