Next.js Font Optimization Explained — Automatic Font Loading

DodaTech Updated 2026-06-28 1 min read

In this tutorial, you will learn about Next.js Font Optimization Explained. We cover key concepts, practical examples, and best practices to help you master this topic.

Next.js next/font automatically optimizes fonts by self-hosting, subsetting, and applying CSS font-display strategies to eliminate layout shift from font loading.

What You'll Learn

next/font/google for Google Fonts
next/font/local for custom fonts
Variable fonts
Font subsets and loading strategies
Preventing layout shift

Why It Matters

Web fonts cause cumulative layout shift (CLS) and slow initial render. next/font eliminates these by self-hosting fonts, reducing HTTP requests, and applying size-adjust automatically.

// app/layout.jsx
import { Inter, Roboto_Mono } from "next/font/google";
import localFont from "next/font/local";

const inter = Inter({
  subsets: ["latin"],
  display: "swap",
  variable: "--font-inter",
});

const robotoMono = Roboto_Mono({
  subsets: ["latin"],
  display: "swap",
  variable: "--font-roboto-mono",
});

const customFont = localFont({
  src: "./fonts/custom.woff2",
  display: "swap",
  variable: "--font-custom",
});

export default function RootLayout({ children }) {
  return (
    <html lang="en" className={`${inter.variable} ${robotoMono.variable} ${customFont.variable}`}>
      <body style={{ fontFamily: "var(--font-inter)" }}>
        {children}
      </body>
    </html>
  );
}

Expected output: Google Fonts are self-hosted with no external requests, subsets reduce file size, CSS variables apply fonts without layout shift.

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