Next.js Image Optimization Explained — Automatic Image Optimization

DodaTech Updated 2026-06-28 1 min read

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

Next.js Image component automatically optimizes images with Lazy Loading, responsive sizing, modern formats (WebP/AVIF), and blur-up placeholders for improved performance.

What You'll Learn

Image component props and configuration
Responsive images with sizes
Remote images and domains
Placeholder and blurDataURL
Performance benefits

Why It Matters

Images are the largest contributor to page weight. Next.js Image optimization reduces image payload by 30-90% through format conversion, compression, and lazy loading.

import Image from "next/image";

export default function Gallery() {
  return (
    <div className="gallery">
      <Image
        src="/hero.jpg"
        alt="Hero image"
        width={1200}
        height={630}
        priority
        className="hero-image"
      />

      <Image
        src="https://images.example.com/photo.jpg"
        alt="Remote photo"
        width={800}
        height={600}
        placeholder="blur"
        blurDataURL="data:image/jpeg;base64,..."
        sizes="(max-width: 768px) 100vw, 50vw"
      />

      <Image
        src="/avatar.png"
        alt="Avatar"
        width={64}
        height={64}
        className="rounded-full"
      />
    </div>
  );
}

// next.config.js
const nextConfig = {
  images: {
    remotePatterns: [
      { protocol: "https", hostname: "images.example.com" },
      { protocol: "https", hostname: "cdn.example.com" },
    ],
    formats: ["image/avif", "image/webp"],
    deviceSizes: [640, 750, 1080, 1200, 1920],
  },
};

Expected output: Hero image loads eagerly with priority, remote images show blur placeholder, all images serve WebP/AVIF formats responsively.

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