The Developer's Quarterly

If you build React apps with Next.js long enough, you eventually hit the same question: should this image live in public, or should I import it from the component? Both work, but they do not behave the same way.

The difference is not just style. It affects how the image is referenced, whether Next.js can infer dimensions, how much optimization you get, and how easy it is to reuse the asset across the app.

What the public folder is for

Next.js serves files in public from the site root. A file at public/avatars/me.png becomes available at /avatars/me.png.

That makes public a good fit for assets that behave like static site content: logos, icons, robots files, marketing images, screenshots, and files that need a predictable URL outside the module graph.

File on disk

public/avatars/me.png

Use from a component

      import Image from 'next/image';

export function AvatarOfMe() {
  return (
    <Image
      src="/avatars/me.png"
      alt="A portrait of me"
      width={64}
      height={64}
    />
  );
}
    

That path is easy to reason about. If the file exists in public, the URL works from the root of the site. You do not need an import statement, and you do not need to worry about relative path resolution.

What importing an image changes

When you import a local image, the file becomes part of the module graph. Next.js can inspect it at build time and attach useful metadata to the import, including intrinsic width and height.

That is the important advantage. With a static import, the framework knows the image dimensions automatically, which helps prevent layout shift and makes image rendering safer and more consistent.

Imported local image

      import Image from 'next/image';
import profileImage from './profile.png';

export function ProfileCard() {
  return (
    <Image
      src={profileImage}
      alt="Picture of the author"
      placeholder="blur"
    />
  );
}
    

In this version, you do not manually provide width and height. Next.js reads them from the imported file. If the image is available for blur-up placeholder generation, you can also use placeholder="blur" without extra work.

The practical difference

Approach	What it gives you	Best fit
public/	Stable root URL, no import step, simple asset access	Favicons, logos, marketing images, files referenced by path
import	Build-time metadata, automatic dimensions, tighter code ownership	Component-scoped images, local UI assets, images that benefit from optimization

The cleanest mental model is this: public makes the image look like a static website asset, while importing the image makes it behave like part of the application code.

Why imported images often feel better in components

1 Dimensions are automatic

Next.js can infer the image width and height from the file itself, which reduces layout shift risk.

2 Local ownership is clearer

The image lives beside the component or feature that uses it, so refactors are easier to reason about.

3 Optimization is easier

next/image can do more when it knows the source is a local asset managed by the build.

That matters most for product UI, profile cards, feature callouts, and any component that owns its own visual asset.

Why public still matters

The public folder is still the right choice when the image needs a stable URL that is independent of code imports.

Useful public assets

      public/logo.svg
public/robots.txt
public/avatars/jane.png
public/images/landing-hero.jpg
    

It is especially convenient for files that are not really part of a React component. A social preview image, a downloadable brochure, or a shared brand logo can live in public and be addressed with a simple absolute path.

There is also a caching detail worth knowing. Next.js cannot safely assume public files will stay unchanged forever, so it uses conservative caching headers by default. That keeps the behavior predictable when those assets may be edited and redeployed.

A side-by-side example

Suppose you want the same avatar image available in two ways: as a shared site asset and as a component-owned local asset.

From public

      import Image from 'next/image';

export function PublicAvatar() {
  return (
    <Image
      src="/avatars/me.png"
      alt="Profile avatar"
      width={96}
      height={96}
    />
  );
}
    

Imported locally

      import Image from 'next/image';
import avatar from './me.png';

export function LocalAvatar() {
  return <Image src={avatar} alt="Profile avatar" />;
}
    

Both render an image. The difference is in how Next.js gets the source and metadata.

The public version is a direct URL reference. The imported version is a build-managed asset with richer metadata.

When each option is the better call

Use public When you want a stable root-relative URL and the image should behave like a classic static asset.

Import the image When the image belongs to a component or feature and should participate in the build pipeline.

Use import for UI images When automatic dimensions and blur placeholders reduce layout and loading issues.

Use public for shared assets When the same file needs to be referenced from multiple places with one stable URL.

The common mistake

The mistake is treating both options as interchangeable without thinking about the consequences.

If you keep every image in public, you lose some of the build-time benefits that imported images provide. If you import everything, you may make simple root-level assets harder to reference and maintain.

The best choice usually depends on ownership. Ask one question: is this image a shared site asset, or is it part of a specific component or feature?

Bottom line

Use public when you want a straightforward URL and a static asset that does not need to participate in the module graph. Import the image when you want Next.js to treat it as part of the application, infer dimensions, and manage it through the build.

That is the real difference. It is not about which one is universally better. It is about which one gives the image the right kind of lifecycle for the job.