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If a Next.js image is missing, start with the image request in your browser’s Network panel—not with a guess based on the blank space. A 404 usually sends you toward the file path; a 400 from the Next.js image route can indicate a pattern mismatch. If the request succeeds, check the rendered image’s dimensions, its parent layout, and whether the deployment can run the optimizer. These checks separate the common causes without changing unrelated settings.
Start with the failing image request
Open your browser’s developer tools, select the Network panel, and reload the page. Filter for images or search for the image filename, then inspect the request URL and status. Also inspect the rendered element in the Elements panel: a blank area alone does not tell you whether the request failed, the element has no visible size, or the image is simply outside the expected layout.
- 404: First verify that the file exists at the expected location and that the URL maps to it correctly.
- 400 from an image route: Check whether the requested local or remote URL is permitted by the configured image patterns.
- A successful image response, but no visible image: Check the element’s dimensions, its parent, and CSS that could affect visibility or cropping.
- Different results locally and after deployment: Check how the deployed app handles image optimization and whether the source requires authentication.
A 400 or a blank visual area does not identify one cause by itself. Follow the request and the element to the relevant branch below.
Fix local image paths and local pattern mismatches
Map the public folder to the URL correctly
Files placed in the project’s root public folder are served from the site root. For example, a file at public/avatars/me.png is requested at /avatars/me.png, not /public/avatars/me.png. The Image component’s source should use that URL:
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import Image from 'next/image';
export default function Avatar() {
return <Image src="/avatars/me.png" alt="Profile" width={96} height={96} />;
}Confirm both sides of the mapping: the file is in the root public directory, and the browser request uses the root-relative URL with public omitted. If the request URL is wrong, fix the source path before changing image optimization settings. See the Next.js public folder convention.
Check localPatterns if they are configured
If your project sets images.localPatterns, a local file can exist and still be rejected when its requested path does not match the configured pathname pattern. Query strings can matter, too: the match can include the URL’s search string. A configured empty search value requires a URL with no query string, while omitting search allows search parameters. A cache-busting query added to a URL can therefore make a previously matching path stop matching.
Compare the actual request—including its query string—with localPatterns, then adjust the pattern only as broadly as the application requires. The Next.js localPatterns error documentation describes the matching behavior.
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Fix remote image host and URL pattern mismatches
Remote URLs used by next/image need to be allowed by images.remotePatterns. Matching can depend on the protocol, hostname, port, pathname, and configured search string. Check the exact URL from the failed request; do not assume that allowing one hostname also allows its www version, another subdomain, or every path on a CDN.
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- Protocol: Confirm whether the request uses
httporhttps. - Hostname: Compare the full host, including any CDN or asset subdomain.
- Port: Check for a non-default port in the URL.
- Pathname: Confirm that the pattern covers the path prefix and requested image path.
- Search: Check the query string if the pattern specifies one, or restricts it to no query string.
Use the narrowest pattern that covers the intended source. The current Image API warns that omitted pattern fields imply broad wildcards, which can permit URLs beyond those the application intended to optimize. The older images.domains option has been deprecated since Next.js 14 in favor of strict remotePatterns. The exact syntax available depends on the installed Next.js version, so check the matching documentation before copying a configuration. The unconfigured-host guide notes that versions before 15.3.0 use the object form of remotePatterns, and versions before 12.3.0 may use images.domains.
For an object-form configuration, a narrowly scoped pattern might look like this; change the hostname and path to match your actual image source, and verify the syntax against your installed release:
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module.exports = {
images: {
remotePatterns: [
{
protocol: 'https',
hostname: 'assets.example.com',
pathname: '/account123/**',
},
],
},
};This example does not authorize every host or path. A mismatch between the configured pattern and the actual source can produce an unconfigured-host error. See the Next.js unconfigured-host guide and the Image Component API.
Check dimensions, fill, and the parent layout
For a remote or dynamically supplied source, the current Image API requires width and height, unless you use fill. A static import supplies intrinsic dimensions automatically. The width and height describe the image’s intrinsic dimensions and let Next.js reserve space; CSS controls the rendered size. Missing dimensions are a layout issue to investigate, but they do not explain every failed network request.
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<Image
src="https://assets.example.com/account123/photo.jpg"
alt="A person standing outdoors"
width={1200}
height={800}
/>Use values that reflect the source image’s aspect ratio. If the design renders the image smaller, size it with the layout and CSS rather than treating the intrinsic dimensions as its final display size.
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Use fill only when the parent has a usable box
With fill, the image expands to its parent. That parent needs positioning—commonly position: relative—and a meaningful size. If the parent has no usable dimensions, the image may not occupy the space you expect. Set object-fit: cover when the image should fill the area with cropping, or contain when it should fit without cropping.
<div className="photo-frame">
<Image
src="https://assets.example.com/account123/photo.jpg"
alt="A person standing outdoors"
fill
style={{ objectFit: 'cover' }}
/>
</div>.photo-frame {
position: relative;
width: 100%;
aspect-ratio: 3 / 2;
}The Image Component API documents the dimension and fill requirements. If the request itself is a 404 or a pattern-related 400, resolve that request problem separately from layout.
Match image optimization to the deployment and source
Runtime deployment versus static export
The self-hosting guide documents default image optimization when an application is deployed using next start. A static export follows a different path: the guide documents a custom image loader, and optimization is not performed at build time for that export. If images work in a runtime deployment but not in a static export, check whether the delivery setup expects a loader or a separate image optimization service rather than assuming the source file is missing.
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Authenticated image sources
If an image source requires authentication, the optimizer may not be able to fetch it with the credentials it needs. The Image API recommends considering unoptimized to disable optimization for that image. This can avoid routing a protected source through the optimizer, but it also disables optimization for that image; use it only if that matches the application’s delivery and security setup.
Custom loaders and external optimization
A custom loader can generate image URLs for third-party cloud image providers. The self-hosting guide also describes using a separate image optimization service. These are design choices for applications whose deployment or image delivery needs them—not mandatory fixes for every missing image. See the Next.js self-hosting guide for the documented runtime and static-export paths.
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- Record the failing URL and status in the browser’s Network panel. Verify that you are inspecting the image request rather than inferring the cause from a blank area.
- If it is a local URL, check the file mapping. Confirm the file is under the root
publicfolder and omit/publicfrom its URL. - If localPatterns are configured, compare the pathname and search. Check whether the request’s query string is allowed.
- If it is a remote URL, compare every relevant part with remotePatterns. Check protocol, hostname, port, path, and configured search string; confirm the syntax fits the installed Next.js version.
- If the response succeeds, inspect the layout. Check dimensions,
fill, parent positioning and size, and the intended object fit. - If the behavior changes after deployment, check the optimization path. Determine whether the deployment uses
next startor a static export, and whether the source requires authentication.
Change the setting tied to the evidence you found. Broadly allowing remote hosts, disabling optimization everywhere, or changing layout props will not correct an unrelated 404.
Or skip the browser setup
If you want a visual capture of the page while you work through the failing image request, ScreenshotNeo can return a screenshot from one API request. A screenshot can show what the page rendered, but it does not replace inspecting the request status or fixing a Next.js path, pattern, layout, or deployment mismatch. See the ScreenshotNeo documentation.
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Official references
- Next.js Image Component API
- Next.js unconfigured-host error
- Next.js unconfigured-localPatterns error
- Next.js public folder convention
- Next.js self-hosting guide
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