# No Page Custom Font
> Prevent page-only custom fonts.
### Why This Error Occurred
- The custom font you're adding was added to a page - this only adds the font to the specific page and not the entire application.
- The custom font you're adding was added to a separate component within `pages/_document.js` - this disables automatic font optimization.
### Possible Ways to Fix It
Create the file `./pages/_document.js` and add the font to a custom Document:
```jsx
// pages/_document.js
import Document, { Html, Head, Main, NextScript } from 'next/document'
class MyDocument extends Document {
render() {
return (
)
}
}
export default MyDocument
```
Or as a function component:
```js
// pages/_document.js
import { Html, Head, Main, NextScript } from 'next/document'
export default function Document() {
return (
)
}
```
### When Not To Use It
If you have a reason to only load a font for a particular page or don't care about font optimization, then you can disable this rule.
### Useful Links
- [Custom Document](https://nextjs.org/docs/advanced-features/custom-document)
- [Font Optimization](https://nextjs.org/docs/basic-features/font-optimization)