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Image behavior and configuration can change between Next.js versions, so check the Image component and configuration references for the version installed in your project.
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Start with layout: dimensions, sizes, and fill
For a fixed-size image, provide its intrinsic width and height. These values describe the image’s aspect ratio and let the browser reserve space while it loads; they do not dictate its final CSS-rendered size. Next.js explains that the attributes help infer the aspect ratio and avoid layout shift (Next.js Image Component documentation).
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export default function ArticleImage() {
return (
<Image
src="/images/feature.jpg"
alt="A person working at a desk beside a window"
width={1200}
height={800}
sizes="(max-width: 700px) 100vw, 700px"
style={{ width: '100%', height: 'auto' }}
/>
)
}Write sizes to describe the image’s expected rendered width at the breakpoints in your actual CSS. The example says the image takes the full viewport width up to 700 pixels, then occupies a maximum 700 pixels. Change those conditions and values to match your layout; they are not universal defaults. The browser uses sizes to choose a suitable candidate from the responsive srcset. Without it, a responsive image can be treated as viewport-wide, causing a larger download than its rendered layout requires. See the Pages Router Image reference for the responsive-image behavior.
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Using fill for a responsive box
With fill, the image occupies its positioned parent rather than taking its dimensions from width and height props. Establish the parent’s positioning and dimensions, then choose whether the image should crop or fit inside the box.
<div className="hero">
<Image
src="/images/hero.jpg"
alt="A city skyline at sunset"
fill
sizes="(max-width: 768px) 100vw, 50vw"
style={{ objectFit: 'cover' }}
/>
</div>.hero {
position: relative;
min-height: 18rem;
}Here, cover fills the box and can crop the image; use contain when the complete image must remain visible, accepting that unused space may remain. The sample sizes is illustrative: align its breakpoint and width fractions with the real CSS layout.
How do I use a custom loader with next/image?
A loader is a URL-building function. Next.js passes it the source, the requested width, and optionally quality; the function returns a URL in the syntax expected by your image optimization service. The function does not itself resize an image or configure the provider.
Configure a loader for one Image
import Image from 'next/image'
function imageLoader({ src, width, quality }) {
return makeProviderUrl({
src,
width,
quality: quality ?? 75,
})
}
export default function ProductImage() {
return (
<Image
loader={imageLoader}
src="https://images.example.com/products/item.jpg"
alt="Blue ceramic mug"
width={900}
height={900}
sizes="(max-width: 600px) 100vw, 300px"
/>
)
}makeProviderUrl above is deliberately provider-specific pseudocode, not a complete integration: replace it with the provider’s documented URL construction. The quality fallback of 75 follows the official loader example; confirm accepted quality values and width behavior with your provider.
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Configure a loader for the project
For app-wide behavior, set loader: 'custom' and loaderFile in next.config.js. The loader file path is relative to the project root and the file exports a default function.
// next.config.js
module.exports = {
images: {
loader: 'custom',
loaderFile: './src/lib/image-loader.js',
},
}// src/lib/image-loader.js
export default function imageLoader({ src, width, quality }) {
return makeProviderUrl({ src, width, quality: quality ?? 75 })
}Use the module syntax appropriate to your project’s configuration setup. The supported options and file handling are documented in the Image component reference and image configuration reference.
Validate the provider integration
Before deploying, verify that the returned URL correctly encodes the source and requests a transformation the provider supports. Check allowed source hosts, width and quality constraints, format negotiation, and the provider’s cache and invalidation behavior. A custom loader controls URL generation; it does not prove that the external service is reachable, configured, compatible, or affordable for your traffic.
Built-in optimization or an external image service?
The default loader uses Next.js’s Image Optimization API. A custom loader is the documented path when you want an external image optimization service or image CDN to generate transformed image URLs. The right choice depends on your deployment and source-image requirements, as well as provider-specific behavior; Next.js does not determine a third-party service’s price, transformations, or cache policy.
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| Decision area | Built-in Next.js optimizer | Custom loader and external service |
|---|---|---|
| Transformation control | Uses the Next.js image optimization API and its configuration. | URL parameters and transformations depend on the provider. |
| Hosting fit | Uses the Next.js deployment’s image optimization setup. | Depends on the chosen service and how it is hosted or reached. |
| Remote-source access | Remote URLs must satisfy configured remotePatterns; source authentication headers are not forwarded. |
Depends on the provider’s source-access model and your URL construction. |
| Widths and quality | Use the widths and quality settings supported by the installed Next.js version and configuration. | Must match the provider’s accepted parameters and limits. |
| Format negotiation | Configured formats are negotiated using the request’s Accept header. |
Depends on provider behavior and the URLs your loader generates. |
| Cache and invalidation | Uses the built-in optimizer’s cache behavior; it has no cache invalidation mechanism. | Cache duration and invalidation depend on the service. |
| Operational responsibility | Runs through the Next.js image optimization path. | Requires an available, correctly configured external service. |
Use the default when its deployment, source access, formats, and cache behavior meet your needs. Consider a custom loader when an external service is already part of your delivery architecture or its transformations are required. The Next.js loader documentation describes the external cloud-provider loader approach.
How do I use a remote image with next/image?
When the built-in optimizer fetches a remote image, allow only the sources your application expects. Configure remotePatterns with the intended protocol, hostname, path, and search-string policy. Avoid broad patterns: they can authorize URLs beyond the source set you meant to permit.
// next.config.js
module.exports = {
images: {
remotePatterns: [
{
protocol: 'https',
hostname: 'images.example.com',
port: '',
pathname: '/products/**',
search: '',
},
],
},
}Use the pattern syntax supported by your installed Next.js version. The example permits HTTPS images under the specified path and no query string; adjust it only if your source URLs require different paths or parameters. The default optimizer does not forward authentication headers when it fetches a source. For authenticated images, Next.js advises considering unoptimized rather than expecting those headers to reach the source.
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SVG and other special cases
SVG images are generally served unoptimized. If you enable SVG optimization, follow Next.js’s documented content-disposition and content-security-policy protections rather than treating SVG as an ordinary raster image. Consult the Image component documentation for the configuration details applicable to your version.
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Formats, caching, and replacement behavior
The built-in optimizer chooses among configured output formats based on the incoming request’s Accept header. WebP is the documented default format; AVIF can also be configured, with encoding and cache tradeoffs described by Next.js. If a proxy or CDN sits in front of Next.js, it must forward Accept for format negotiation to work as intended.
minimumCacheTTL sets a lower bound, while upstream cache-control information can extend the effective max age. Next.js documents no cache invalidation mechanism for optimized images. If an image must be replaced in place, plan for that cache behavior: prefer a changed source URL when appropriate, or clear the image cache where your deployment permits it. These are built-in optimizer details; an external provider’s formats, cache lifetime, and invalidation controls are separate questions.
When should I preload an image?
Preload only when you know which above-the-fold image is likely to be the page’s Largest Contentful Paint (LCP) image. The Pages Router reference notes that loading="eager" or fetchPriority="high" may be preferable in most cases. Avoid preloading several competing candidates, especially when the likely LCP image changes with viewport size or other loading and fetch-priority controls are already in use. Choose the setting that fits the rendered page and verify the API against your Next.js version (Pages Router Image reference).
Troubleshooting common image issues
- The image request is rejected for a remote source: Check that protocol, hostname, pathname, and search policy match the source URL in
remotePatterns. Tighten or adjust the pattern rather than allowing arbitrary hosts. - An authenticated source fails through the built-in optimizer: The optimizer does not forward request headers to the source. Consider
unoptimizedfor that image, or choose a source-delivery approach that does not depend on forwarded authentication headers. - The browser downloads an image that is too large: Check the rendered CSS width and the image’s
sizesvalue together. Ifsizesis missing or describes a wider layout than the real one, the browser may choose an unnecessarily large candidate. - The page shifts when the image loads: Provide accurate intrinsic width and height for fixed-size images, or establish a correctly sized parent for
fill. Confirm that CSS does not undermine the reserved aspect ratio. - A custom URL returns the wrong size, format, or quality: Inspect the generated URL and compare its parameters with the provider’s accepted syntax and limits. The loader only constructs the request; transformation behavior belongs to the provider.
- A replaced source still appears unchanged: The built-in optimizer has no cache invalidation mechanism. Use a changed source URL when suitable, or clear the image cache if the deployment permits it.
- Format negotiation does not produce the expected format: Check the configured formats and whether an intervening proxy or CDN forwards the request’s
Acceptheader. - SVG optimization is unsafe or unexpected: SVGs are generally served unoptimized. If enabling optimization, apply the documented content disposition and content security policy settings for your Next.js version.
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