favicon, apple-icon, and icon

The favicon, apple-icon or, icon file conventions allow you to set icons for your application.

They are useful for adding app icons that appear in places like web browser tabs, phone home screens, and search engine results.

There are two ways to set app icons:

Using image files (.ico, .jpg, .png)
Using code to generate an icon (.js, .ts, .tsx)

Image files (.ico, .jpg, .png)

Use an image file to set an app icon by placing a favicon, icon, or apple-icon image file the root /app segment.

Next.js will evaluate the file and automatically add the appropriate tags to your app's <head> element.

File convention	Supported file types
`favicon`	`.ico`
`icon`	`.ico`, `.jpg`, `.jpeg`, `.png`, `.svg`
`apple-icon`	`.jpg`, `.jpeg`, `.png`,

`favicon`

Add a favicon.ico image file to the root /app route segment.

<head> output

<link rel="icon" href="/favicon.ico" sizes="any" />

`icon`

Add an icon.(ico|jpg|jpeg|png|svg) image file to the root /app route segment.

<head> output

<link
  rel="icon"
  href="/icon?<generated>"
  type="image/<generated>"
  sizes="<generated>"
/>

`apple-icon`

Add an apple-icon.(jpg|jpeg|png) image file to the root /app route segment.

<head> output

<link
  rel="apple-touch-icon"
  href="/apple-icon?<generated>"
  type="image/<generated>"
  sizes="<generated>"
/>

Good to know

You can set multiple icons by adding a number suffix to the file name. For example, icon1.png, icon2.png, etc. Numbered files will sort lexically.

App icons can only be set in the root /app segment.

The appropriate <link> tags and attributes such as rel, href, type, and sizes are determined by the icon type and metadata of the evaluated file.

For example, a 32 by 32px .png file will have type="image/png" and sizes="32x32" attributes.

sizes="any" is added to favicon.ico output to avoid a browser bug where an .ico icon is favored over .svg.

Generate icons using code (.js, .ts, .tsx)

In addition to using literal image files, you can programmatically generate icons using code.

Generate an app icon by creating an icon or apple-icon route that default exports a function.

File convention	Supported file types
`icon`	`.js`, `.ts`, `.tsx`
`apple-icon`	`.js`, `.ts`, `.tsx`

The easiest way to generate an icon is to use the ImageResponse API from next/server.

app/icon.tsx

import { ImageResponse } from 'next/server';
 
// Route segment config
export const runtime = 'edge';
 
// Image metadata
export const size = {
  width: 32,
  height: 32,
};
export const contentType = 'image/png';
 
// Image generation
export default function Icon() {
  return new ImageResponse(
    (
      // ImageResponse JSX element
      <div
        style={{
          fontSize: 24,
          background: 'black',
          width: '100%',
          height: '100%',
          display: 'flex',
          alignItems: 'center',
          justifyContent: 'center',
          color: 'white',
        }}
      >
        A
      </div>
    ),
    // ImageResponse options
    {
      // For convenience, we can re-use the exported icons size metadata
      // config to also set the ImageResponse's width and height.
      ...size,
    },
  );
}

<head> output

<link rel="icon" href="/icon?<generated>" type="image/png" sizes="32x32" />

Good to know

By default, generated icons are statically optimized (generated at build time and cached) unless they use dynamic functions or dynamic data fetching.

You can generate multiple icons in the same file using generateImageMetadata.

You cannot generate a favicon icon. Use icon or a favicon.ico file instead.

Props

The default export function receives the following props:

`params` (optional)

An object containing the dynamic route parameters object from the root segment down to the segment icon or apple-icon is colocated in.

app/shop/[slug]/icon.tsx

export default function Icon({ params }: { params: { slug: string } }) {
  // ...
}

Route	URL	`params`
`app/shop/icon.js`	`/shop`	`undefined`
`app/shop/[slug]/icon.js`	`/shop/1`	`{ slug: '1' }`
`app/shop/[tag]/[item]/icon.js`	`/shop/1/2`	`{ tag: '1', item: '2' }`
`app/shop/[...slug]/icon.js`	`/shop/1/2`	`{ slug: ['1', '2'] }`

Returns

Note: ImageResponse satisfies this return type.

Config exports

You can optionally configure the icon's metadata by exporting size and contentType variables from the icon or apple-icon route.

Option	Type
`size`	`{ width: number; height: number }`
`contentType`	`string` - image MIME type

`size`

icon.tsx / apple-icon.tsx

export const size = { width: 32, height: 32 };
 
export default function Icon() {}

<head> output

<link rel="icon" sizes="32x32" />

`contentType`

icon.tsx / apple-icon.tsx

export const contentType = 'image/png';
 
export default function Icon() {}

<head> output

<link rel="icon" type="image/png" />

Route Segment Config

icon and apple-icon are specialized Route Handlers that can use the same route segment configuration options as Pages and Layouts.

Option	Type	Default
`dynamic`	`'auto' \| 'force-dynamic' \| 'error' \| 'force-static'`	`'auto'`
`revalidate`	`false \| 'force-cache' \| 0 \| number`	`false`
`runtime`	`'nodejs' \| 'edge'`	`'nodejs'`
`preferredRegion`	`'auto' \| 'global' \| 'home' \| string \| string[]`	`'auto'`

app/icon.tsx

export const runtime = 'edge';
 
export default function Icon() {}