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Last updated April 15, 2025

If you want to use a cloud provider to optimize images instead of using the Next.js built-in Image Optimization API, you can configurenext.config.js with the following:

next.config.js
module.exports= {  images: {    loader:'custom',    loaderFile:'./my/image/loader.js',  },}

ThisloaderFile must point to a file relative to the root of your Next.js application. The file must export a default function that returns a string, for example:

my/image/loader.js
exportdefaultfunctionmyImageLoader({ src, width, quality }) {return`https://example.com/${src}?w=${width}&q=${quality||75}`}

Alternatively, you can use theloader prop to pass the function to each instance ofnext/image.

To learn more about configuring the behavior of the built-inImage Optimization API and theImage Component, seeImage Configuration Options for available options.

Example Loader Configuration

Akamai

// Docs: https://techdocs.akamai.com/ivm/reference/test-images-on-demandexportdefaultfunctionakamaiLoader({ src, width, quality }) {return`https://example.com/${src}?imwidth=${width}`}

AWS CloudFront

// Docs: https://aws.amazon.com/developer/application-security-performance/articles/image-optimizationexportdefaultfunctioncloudfrontLoader({ src, width, quality }) {consturl=newURL(`https://example.com${src}`)url.searchParams.set('format','auto')url.searchParams.set('width',width.toString())url.searchParams.set('quality', (quality||75).toString())returnurl.href}

Cloudinary

// Demo: https://res.cloudinary.com/demo/image/upload/w_300,c_limit,q_auto/turtles.jpgexportdefaultfunctioncloudinaryLoader({ src, width, quality }) {constparams= ['f_auto','c_limit',`w_${width}`,`q_${quality||'auto'}`]return`https://example.com/${params.join(',')}${src}`}

Cloudflare

// Docs: https://developers.cloudflare.com/images/transform-imagesexportdefaultfunctioncloudflareLoader({ src, width, quality }) {constparams= [`width=${width}`,`quality=${quality||75}`,'format=auto']return`https://example.com/cdn-cgi/image/${params.join(',')}/${src}`}

Contentful

// Docs: https://www.contentful.com/developers/docs/references/images-api/exportdefaultfunctioncontentfulLoader({ src, width, quality }) {consturl=newURL(`https://example.com${src}`)url.searchParams.set('fm','webp')url.searchParams.set('w',width.toString())url.searchParams.set('q', (quality||75).toString())returnurl.href}

Fastly

// Docs: https://developer.fastly.com/reference/io/exportdefaultfunctionfastlyLoader({ src, width, quality }) {consturl=newURL(`https://example.com${src}`)url.searchParams.set('auto','webp')url.searchParams.set('width',width.toString())url.searchParams.set('quality', (quality||75).toString())returnurl.href}

Gumlet

// Docs: https://docs.gumlet.com/reference/image-transform-sizeexportdefaultfunctiongumletLoader({ src, width, quality }) {consturl=newURL(`https://example.com${src}`)url.searchParams.set('format','auto')url.searchParams.set('w',width.toString())url.searchParams.set('q', (quality||75).toString())returnurl.href}

ImageEngine

// Docs: https://support.imageengine.io/hc/en-us/articles/360058880672-DirectivesexportdefaultfunctionimageengineLoader({ src, width, quality }) {constcompression=100- (quality||50)constparams= [`w_${width}`,`cmpr_${compression}`)]return`https://example.com${src}?imgeng=/${params.join('/')`}

Imgix

// Demo: https://static.imgix.net/daisy.png?format=auto&fit=max&w=300exportdefaultfunctionimgixLoader({ src, width, quality }) {consturl=newURL(`https://example.com${src}`)constparams=url.searchParamsparams.set('auto',params.getAll('auto').join(',')||'format')params.set('fit',params.get('fit')||'max')params.set('w',params.get('w')||width.toString())params.set('q', (quality||50).toString())returnurl.href}

PixelBin

// Doc (Resize): https://www.pixelbin.io/docs/transformations/basic/resize/#width-w// Doc (Optimise): https://www.pixelbin.io/docs/optimizations/quality/#image-quality-when-delivering// Doc (Auto Format Delivery): https://www.pixelbin.io/docs/optimizations/format/#automatic-format-selection-with-f_auto-url-parameterexportdefaultfunctionpixelBinLoader({ src, width, quality }) {constname='<your-cloud-name>'constopt=`t.resize(w:${width})~t.compress(q:${quality||75})`return`https://cdn.pixelbin.io/v2/${name}/${opt}/${src}?f_auto=true`}

Sanity

// Docs: https://www.sanity.io/docs/image-urlsexportdefaultfunctionsanityLoader({ src, width, quality }) {constprj='zp7mbokg'constdataset='production'consturl=newURL(`https://cdn.sanity.io/images/${prj}/${dataset}${src}`)url.searchParams.set('auto','format')url.searchParams.set('fit','max')url.searchParams.set('w',width.toString())if (quality) {url.searchParams.set('q',quality.toString())  }returnurl.href}

Sirv

// Docs: https://sirv.com/help/articles/dynamic-imaging/exportdefaultfunctionsirvLoader({ src, width, quality }) {consturl=newURL(`https://example.com${src}`)constparams=url.searchParamsparams.set('format',params.getAll('format').join(',')||'optimal')params.set('w',params.get('w')||width.toString())params.set('q', (quality||85).toString())returnurl.href}

Supabase

// Docs: https://supabase.com/docs/guides/storage/image-transformations#nextjs-loaderexportdefaultfunctionsupabaseLoader({ src, width, quality }) {consturl=newURL(`https://example.com${src}`)url.searchParams.set('width',width.toString())url.searchParams.set('quality', (quality||75).toString())returnurl.href}

Thumbor

// Docs: https://thumbor.readthedocs.io/en/latest/exportdefaultfunctionthumborLoader({ src, width, quality }) {constparams= [`${width}x0`,`filters:quality(${quality||75})`]return`https://example.com${params.join('/')}${src}`}

ImageKit.io

// Docs: https://imagekit.io/docs/image-transformationexportdefaultfunctionimageKitLoader({ src, width, quality }) {constparams= [`w-${width}`,`q-${quality||80}`]return`https://ik.imagekit.io/your_imagekit_id/${src}?tr=${params.join(',')}`}

Nitrogen AIO

// Docs: https://docs.n7.io/aio/intergrations/exportdefaultfunctionaioLoader({ src, width, quality }) {consturl=newURL(src,window.location.href)constparams=url.searchParamsconstaioParams=params.getAll('aio')aioParams.push(`w-${width}`)if (quality) {aioParams.push(`q-${quality.toString()}`)  }params.set('aio',aioParams.join(';'))returnurl.href}

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