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How to Fix Next.js Image Optimization and Remote Image Errors

Find the cause of a failing next/image source and apply the smallest safe fix for host patterns, local paths, authentication, static export, or layout.
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Most next/image failures come down to one of four causes: the image URL does not match the configured allowlist, the source needs authentication, the deployment uses static export with the default optimizer, or the image has no usable layout dimensions. Start by checking the exact src value passed to the component, then apply the matching fix below.

Identify which image rule is failing

Inspect the actual src value at runtime and classify it before changing configuration: a local path, a remote URL, an authenticated URL, or an image rendered by a static export. The exact error message can narrow the cause, but the source and deployment setup determine the right fix.

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Symptom Likely cause First fix to check
“Un-configured Host” A remote URL component does not match remotePatterns. Compare protocol, hostname, port, pathname, and query-string policy against the actual URL. Next.js unconfigured-host guidance.
“Un-configured localPatterns” The local path or its query string is outside localPatterns. Check the allowed pathname and whether query strings are accepted. Next.js local-pattern guidance.
The source requires a login or session The default optimizer cannot fetch the source using browser authentication headers. Use unoptimized where appropriate, or provide a delivery route that authenticates safely. Next.js Image component documentation.
Image optimization fails during static export The default optimizer runs on demand, but static output has no optimization API. Use a server deployment, compatible image provider, custom loader, or unoptimized. Next.js static-export image error guidance.
Invalid images configuration The configuration shape or option is unsupported or invalid for the installed version. Check the option rules for that version. Next.js invalid-images-config guidance.
The image loads but is distorted or shifts the page Dimensions or the parent layout do not establish the intended aspect ratio and size. Supply remote dimensions or use fill inside a sized parent. Next.js Image component documentation.

Fix an unconfigured remote host

Next.js checks a remote image against the URL pattern, not just the domain name. Protocol, hostname, port, pathname, and—in object-form patterns—query-string behavior all matter. Matching is exact and case-sensitive. For example, https://assets.example.com/photos/a.jpg?size=large will not match a pattern for https://example.com/**: the host differs, and a pattern that requires an empty search string would reject the query as well.

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Use a pattern that matches the real source while allowing no more than the app needs:

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// next.config.js
module.exports = {
  images: {
    remotePatterns: [
      {
        protocol: 'https',
        hostname: 'assets.example.com',
        port: '',
        pathname: '/photos/**',
        search: '',
      },
    ],
  },
}

This example permits HTTPS images under /photos/ on that hostname and rejects query strings. If your source URLs use a fixed query string, configure that exact value. If they legitimately vary, omit search in the object pattern to allow any query string; do not do so unless that broader match is acceptable. Narrow patterns reduce the chance that the optimizer will fetch unintended sources. See the Image component API and unconfigured-host error guidance.

Check subdomains, ports, and pattern syntax

  • Confirm the URL uses the expected protocol, such as https, and the exact hostname, including any subdomain.
  • For local development, check whether the URL includes a port and whether the pattern accounts for it.
  • In patterns, * matches one hostname or pathname segment. ** can match multiple segments at the beginning of a hostname or at the end of a pathname; it does not work in the middle.
  • A URL object made from a URL without a query string has an empty search value. That can reject image URLs that include query parameters.

Fix an unconfigured local path

If your error names localPatterns, the source is local but restricted by an allowlist. Add a pathname pattern for the directory the image actually uses and decide whether its URLs may carry query parameters. For example, an allowlist for /assets/images/** with search: '' covers files below that directory but rejects URLs with a query string. A narrower path such as /assets/ may not match nested image files as intended. Check the local-pattern error guidance and the Image component API.

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Handle images that require authentication

The default Image Optimization API does not forward headers when fetching a source image. A browser session or authorization header therefore will not automatically reach a protected image host. Next.js states: “For security reasons, the Image Optimization API using the default loader will not forward headers when fetching the src image.” Next.js Image component documentation.

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If the source cannot be fetched without those credentials, consider rendering it with unoptimized so the browser requests the source directly, or create a delivery route that can authenticate safely. Direct delivery changes where the request is made; make sure the browser is authorized to retrieve that URL and that exposing it is appropriate for your application.

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Choose an image strategy for static export

The built-in optimizer transforms images on demand. A static export does not include that server-side API, so the default loader cannot optimize images in the exported output. The documented alternatives are:

  • Run the app with a server: use next start or another server deployment so the default optimization API is available.
  • Use an image provider or custom loader: delegate image transformations to a service or define how image URLs are generated. Next.js supports per-image loader functions and an application-level loaderFile. Its documentation lists integration examples for providers including Cloudinary, Cloudflare, Imgix, and ImageKit; that list describes integration options, not a ranking or pricing comparison. Next.js Image component documentation.
  • Disable optimization: set unoptimized on an image or configure it for the application when serving original images is acceptable.

unoptimized serves the source without changing its quality, size, or format. It can address static-export constraints or sources that the default optimizer cannot fetch, but it also gives up built-in optimization for those images. Choose based on whether the deployment can run an optimizer, whether sources require authentication, and whether you need optimized responsive variants. For the export-specific explanation, see Next.js static-export image error guidance.

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Fix sizing and layout problems

For remote sources, Next.js cannot inspect the image file during the build. Give the component width and height, or use fill with a parent that has a defined size. The dimensions establish the image’s aspect ratio and help prevent layout shifts; CSS determines its rendered size. See the Image component documentation for sizing behavior.

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Check version and security before broadening access

Use syntax supported by the Next.js version installed in your project. The unconfigured-host guidance documents object-form remotePatterns for versions before 15.3.0 and the older domains option for versions before 12.3.0; it marks domains deprecated since Next.js 14. Current documentation includes both remotePatterns and localPatterns, but an older project may not accept every current option. Compare your configuration with the documentation for your version if Next.js reports a schema error. Host error guidance; invalid configuration guidance.

  • Prefer specific remotePatterns over the legacy domains setting, which does not constrain protocol, port, path, or query behavior as precisely.
  • Do not enable dangerouslyAllowLocalIP for ordinary use: allowing optimization requests to reach internal IP addresses can expose internal network content.
  • SVG files are not optimized by default. If the SVG is known and suitable, Next.js recommends unoptimized. Enabling SVG optimization has security implications; understand the risks and configure protective response headers before doing so. Next.js Image component documentation.

Validate the fix

  1. Read the exact runtime src, including protocol, host, port, path, and query string.
  2. Identify whether the source is local, remote, authenticated, or being used in a static export.
  3. Adjust only the relevant allowlist or delivery strategy, using syntax supported by the installed Next.js version.
  4. Reload the page and confirm that the image request succeeds and that its rendered dimensions behave as intended.

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