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How does next/image optimize images in Next.js?

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01

Understand the problem

Automatic resizing, formats, and lazy loading.

nextjsnext-imageoptimizationperformance
02

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

Nudge consolestandby

Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.

03

Study the solution

next/image serves correctly-sized, modern-format (WebP/AVIF) images on demand, lazy-loads by default, and reserves space (width/height) to prevent layout shift. It optimizes via a built-in loader/CDN, cutting bytes and improving Core Web Vitals.

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04

Read the code

Responsive, priority LCP image
import Image from 'next/image';

<Image
  src="/hero.jpg" alt="Hero"
  width={1200} height={630}      // reserves space → no CLS
  priority                        // eager-load the LCP image
  sizes="(max-width: 768px) 100vw, 1200px"
  placeholder="blur"
/>;
// next.config.js: images: { remotePatterns: [{ hostname: 'cdn.example.com' }] }
05

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