# Font Optimization
Use `next/font` for automatic font optimization with zero layout shift.
## Google Fonts
```tsx
// app/layout.tsx
import { Inter } from 'next/font/google'
const inter = Inter({ subsets: ['latin'] })
export default function RootLayout({ children }: { children: React.ReactNode }) {
return (
{children}
)
}
```
## Multiple Fonts
```tsx
import { Inter, Roboto_Mono } from 'next/font/google'
const inter = Inter({
subsets: ['latin'],
variable: '--font-inter',
})
const robotoMono = Roboto_Mono({
subsets: ['latin'],
variable: '--font-roboto-mono',
})
export default function RootLayout({ children }: { children: React.ReactNode }) {
return (
{children}
)
}
```
Use in CSS:
```css
body {
font-family: var(--font-inter);
}
code {
font-family: var(--font-roboto-mono);
}
```
## Font Weights and Styles
```tsx
// Single weight
const inter = Inter({
subsets: ['latin'],
weight: '400',
})
// Multiple weights
const inter = Inter({
subsets: ['latin'],
weight: ['400', '500', '700'],
})
// Variable font (recommended) - includes all weights
const inter = Inter({
subsets: ['latin'],
// No weight needed - variable fonts support all weights
})
// With italic
const inter = Inter({
subsets: ['latin'],
style: ['normal', 'italic'],
})
```
## Local Fonts
```tsx
import localFont from 'next/font/local'
const myFont = localFont({
src: './fonts/MyFont.woff2',
})
// Multiple files for different weights
const myFont = localFont({
src: [
{
path: './fonts/MyFont-Regular.woff2',
weight: '400',
style: 'normal',
},
{
path: './fonts/MyFont-Bold.woff2',
weight: '700',
style: 'normal',
},
],
})
// Variable font
const myFont = localFont({
src: './fonts/MyFont-Variable.woff2',
variable: '--font-my-font',
})
```
## Tailwind CSS Integration
```tsx
// app/layout.tsx
import { Inter } from 'next/font/google'
const inter = Inter({
subsets: ['latin'],
variable: '--font-inter',
})
export default function RootLayout({ children }) {
return (
{children}
)
}
```
```js
// tailwind.config.js
module.exports = {
theme: {
extend: {
fontFamily: {
sans: ['var(--font-inter)'],
},
},
},
}
```
## Preloading Subsets
Only load needed character subsets:
```tsx
// Latin only (most common)
const inter = Inter({ subsets: ['latin'] })
// Multiple subsets
const inter = Inter({ subsets: ['latin', 'latin-ext', 'cyrillic'] })
```
## Display Strategy
Control font loading behavior:
```tsx
const inter = Inter({
subsets: ['latin'],
display: 'swap', // Default - shows fallback, swaps when loaded
})
// Options:
// 'auto' - browser decides
// 'block' - short block period, then swap
// 'swap' - immediate fallback, swap when ready (recommended)
// 'fallback' - short block, short swap, then fallback
// 'optional' - short block, no swap (use if font is optional)
```
## Don't Use Manual Font Links
Always use `next/font` instead of `` tags for Google Fonts.
```tsx
// Bad: Manual link tag (blocks rendering, no optimization)
// Bad: Missing display and preconnect
// Good: Use next/font (self-hosted, zero layout shift)
import { Inter } from 'next/font/google'
const inter = Inter({ subsets: ['latin'] })
```
## Common Mistakes
```tsx
// Bad: Importing font in every component
// components/Button.tsx
import { Inter } from 'next/font/google'
const inter = Inter({ subsets: ['latin'] }) // Creates new instance each time!
// Good: Import once in layout, use CSS variable
// app/layout.tsx
const inter = Inter({ subsets: ['latin'], variable: '--font-inter' })
// Bad: Using @import in CSS (blocks rendering)
/* globals.css */
@import url('https://fonts.googleapis.com/css2?family=Inter');
// Good: Use next/font (self-hosted, no network request)
import { Inter } from 'next/font/google'
// Bad: Loading all weights when only using a few
const inter = Inter({ subsets: ['latin'] }) // Loads all weights
// Good: Specify only needed weights (for non-variable fonts)
const inter = Inter({ subsets: ['latin'], weight: ['400', '700'] })
// Bad: Missing subset - loads all characters
const inter = Inter({})
// Good: Always specify subset
const inter = Inter({ subsets: ['latin'] })
```
## Font in Specific Components
```tsx
// For component-specific fonts, export from a shared file
// lib/fonts.ts
import { Inter, Playfair_Display } from 'next/font/google'
export const inter = Inter({ subsets: ['latin'], variable: '--font-inter' })
export const playfair = Playfair_Display({ subsets: ['latin'], variable: '--font-playfair' })
// components/Heading.tsx
import { playfair } from '@/lib/fonts'
export function Heading({ children }) {
return {children}
}
```