Introduction

The tailwind starter blog has out of the box support for Next.js's built-in image component and automatically swaps out default image tags in markdown or mdx documents to use the Image component provided.

Usage

To use in a new page route / javascript file, simply import the image component and call it e.g.

import Image from 'next/image';

function Home() {
  return (
    <>
      <h1>My Homepage</h1>
      <Image
        src="/me.png"
        alt="Picture of the author"
        width={500}
        height={500}
      />
      <p>Welcome to my homepage!</p>
    </>
  );
}

export default Home;

For a markdown file, the default image tag can be used and the default img tag gets replaced by the Image component in the build process.

Assuming we have a file called ocean.jpg in data/img/ocean.jpg, the following line of code would generate the optimized image.

![ocean](/blog/static/images/ocean.jpg)

Alternatively, since we are using mdx, we can just use the image component directly! Note, that you would have to provide a fixed width and height. The img tag method parses the dimension automatically.

<Image alt="ocean" src="/static/images/ocean.jpg" width={256} height={128} />

Note: If you try to save the image, it is in webp format, if your browser supports it!

Photo by YUCAR FotoGrafik on Unsplash

Benefits

• Smaller image size with Webp (~30% smaller than jpeg)
• Responsive images - the correct image size is served based on the user's viewport
• Lazy loading - images load as they are scrolled to the viewport
• Avoids Cumulative Layout Shift
• Optimization on demand instead of build-time - no increase in build time!

Limitations

• Due to the reliance on next/image, unless you are using an external image CDN like Cloudinary or Imgix, it is practically required to use Vercel for hosting. This is because the component acts like a serverless function that calls a highly optimized image CDN.
• Images from external links are not passed through next/image
• All images have to be stored in the public folder e.g /blog/static/images/ocean.jpeg