ReactJS
Image Optimization in NextJS
Introduction
To optimize images in Next.js optimally, the next/image component is utilized, boasting features for lazy loading, responsive images, and format selection in relation to the webp,jpeg and avif formats with priority given to performance and SEO.
Key Aspects of next/Image
- Auto optimizes images (resizing, compressing, and format conversion)
- Lazy Loading by default
- Responsive Images with sizes, srcSet etc
- Support for remote image optimization
- Blurred placeholders for improved UX
Basic Usage
import Image from 'next/image';export default function OptimizedImage() {return (<Imagesrc="/images/example.jpg"alt="Example Image"width={600}height={400}/>);}Responsive Images
<Imagesrc="/images/example.jpg"alt="Responsive Image"width={800}height={500}sizes="(max-width: 768px) 100vw, 800px"/>Blurred Placeholder
<Imagesrc="/images/example.jpg"alt="Image with Blur"width={600}height={400}placeholder="blur"blurDataURL="/images/blur-placeholder.jpg"/>Optimize Remote Images
Next, configure next.config.js:
module.exports = {images: {remotePatterns: [{protocol: 'https',hostname: 'example.com',},],},};Then use:
<Imagesrc="https://example.com/image.jpg"alt="Remote Image"width={500}height={300}/>LCP images with priority loading
<Imagesrc="/images/hero.jpg"alt="Hero Image"width={1200}height={800}priority/>Other Configurations in next.config.js
module.exports = {images: {formats: ['image/webp', 'image/avif'], // Use modern, smaller formatsdeviceSizes: [640, 768, 1024, 1280, 1600], // Responsive breakpoints (viewport widths)imageSizes: [16, 32, 48, 64, 96], // For fixed-size images (icons, avatars, etc.)},};Best Practices for Image Optimization in Next.js
- Utilize next/image for all images.
- Use blurred placeholders for enhanced UX (placeholder="blur").
- Identify LCP images with priority for faster loading.
- Use CDNs for executing external images, or check configuration file next.config.js.
- Take luck with more compressed formats (WebP or AVIF).
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