Img vs Image Component in Next.js: Key Differences and Usage

In Next.js, the native <img> tag is a simple HTML element for displaying images, while the <Image> component from Next.js offers built-in optimization like lazy loading, resizing, and better performance. Use <Image> for automatic image optimization and improved loading experience.

Quick Comparison

Here is a quick side-by-side comparison of the native <img> tag and Next.js <Image> component.

Feature	<img> Tag	<Image> Component
Optimization	None, manual handling	Automatic resizing, lazy loading, and optimization
Lazy Loading	Needs manual loading="lazy"	Built-in by default
Responsive Support	Manual srcset and sizes	Automatic srcset and sizes generation
Performance	Depends on developer	Improved by default
Placeholder Support	No	Yes, blur or empty placeholders
Configuration	None	Requires import from 'next/image' and config in next.config.js

Key Differences

The native <img> tag is a simple HTML element that displays images as-is. It requires developers to manually handle optimizations like responsive sizes, lazy loading, and format selection. This means you must write extra code or use third-party tools to improve performance.

On the other hand, Next.js provides an <Image> component that automatically optimizes images. It resizes images to fit the device screen, lazy loads them to improve page speed, and supports modern formats like WebP when possible. This component also supports placeholders to improve perceived loading speed.

Using <Image> requires importing it from 'next/image' and sometimes configuring your Next.js project to allow external image domains. The native <img> tag needs no setup but lacks these performance benefits.

Code Comparison

jsx

export default function ImgExample() {
  return (
    <div>
      <h2>Using &lt;img&gt; tag</h2>
      <img
        src="/images/sample.jpg"
        alt="Sample Image"
        width="600"
        height="400"
        loading="lazy"
        style={{ maxWidth: '100%', height: 'auto' }}
      />
    </div>
  )
}

Output

Displays a 600x400 image with lazy loading using the native <img> tag.

Image Component Equivalent

jsx

import Image from 'next/image'

export default function ImageExample() {
  return (
    <div>
      <h2>Using Next.js &lt;Image&gt; component</h2>
      <Image
        src="/images/sample.jpg"
        alt="Sample Image"
        width={600}
        height={400}
        placeholder="blur"
        blurDataURL="/images/sample-blur.jpg"
      />
    </div>
  )
}

Output

Displays a 600x400 optimized image with lazy loading and blur placeholder using Next.js <Image> component.

When to Use Which

Choose the native <img> tag when you want a quick, simple image without extra setup or optimization needs, such as small icons or decorative images. It is also useful when you need full control over the image behavior or when working outside Next.js.

Choose Next.js <Image> component when you want automatic performance improvements like lazy loading, resizing, and modern format support. It is ideal for most images in Next.js projects to improve load speed and user experience without extra work.

Key Takeaways

Next.js component automatically optimizes images for better performance.

Native tag requires manual optimization and setup for lazy loading and responsiveness.

Use in Next.js projects for improved loading speed and user experience.

Use for simple or decorative images without optimization needs.

Next.js supports placeholders and modern formats out of the box.