You are currently viewing documentation for version 14 of Next.js.
images
If you want to use a cloud provider to optimize images instead of using the Next.js built-in Image Optimization API, you can configure next.config.js
with the following:
next.config.js
module.exports = {
images: {
loader: 'custom',
loaderFile: './my/image/loader.js',
},
}
This loaderFile
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
export default function myImageLoader({ src, width, quality }) {
return `https://example.com/${src}?w=${width}&q=${quality || 75}`
}
Alternatively, you can use the loader
prop to pass the function to each instance of next/image
.
To learn more about configuring the behavior of the built-in Image Optimization API and the Image Component, see Image Configuration Options for available options.
Example Loader Configuration
- Akamai
- AWS CloudFront
- Cloudinary
- Cloudflare
- Contentful
- Fastly
- Gumlet
- ImageEngine
- Imgix
- Thumbor
- Sanity
- Sirv
- Supabase
Akamai
// Docs: https://techdocs.akamai.com/ivm/reference/test-images-on-demand
export default function akamaiLoader({ src, width, quality }) {
return `https://example.com/${src}?imwidth=${width}`
}
AWS CloudFront
// Docs: https://aws.amazon.com/developer/application-security-performance/articles/image-optimization
export default function cloudfrontLoader({ src, width, quality }) {
const url = new URL(`https://example.com${src}`)
url.searchParams.set('format', 'auto')
url.searchParams.set('width', width.toString())
url.searchParams.set('quality', (quality || 75).toString())
return url.href
Cloudinary
// Demo: https://res.cloudinary.com/demo/image/upload/w_300,c_limit,q_auto/turtles.jpg
export default function cloudinaryLoader({ src, width, quality }) {
const params = ['f_auto', 'c_limit', `w_${width}`, `q_${quality || 'auto'}`]
return `https://example.com/${params.join(',')}${src}`
}
Cloudflare
// Docs: https://developers.cloudflare.com/images/url-format
export default function cloudflareLoader({ src, width, quality }) {
const params = [`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/
export default function contentfulLoader({ src, width, quality }) {
const url = new URL(`https://example.com${src}`)
url.searchParams.set('fm', 'webp')
url.searchParams.set('w', width.toString())
url.searchParams.set('q', (quality || 75).toString())
return url.href
}
Fastly
// Docs: https://developer.fastly.com/reference/io/
export default function fastlyLoader({ src, width, quality }) {
const url = new URL(`https://example.com${src}`)
url.searchParams.set('auto', 'webp')
url.searchParams.set('width', width.toString())
url.searchParams.set('quality', (quality || 75).toString())
return url.href
}
Gumlet
// Docs: https://docs.gumlet.com/reference/image-transform-size
export default function gumletLoader({ src, width, quality }) {
const url = new URL(`https://example.com${src}`)
url.searchParams.set('format', 'auto')
url.searchParams.set('w', width.toString())
url.searchParams.set('q', (quality || 75).toString())
return url.href
}
ImageEngine
// Docs: https://support.imageengine.io/hc/en-us/articles/360058880672-Directives
export default function imageengineLoader({ src, width, quality }) {
const compression = 100 - (quality || 50)
const params = [`w_${width}`, `cmpr_${compression}`)]
return `https://example.com${src}?imgeng=/${params.join('/')`
}
Imgix
// Demo: https://static.imgix.net/daisy.png?format=auto&fit=max&w=300
export default function imgixLoader({ src, width, quality }) {
const url = new URL(`https://example.com${src}`)
const params = url.searchParams
params.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())
return url.href
}
Thumbor
// Docs: https://thumbor.readthedocs.io/en/latest/
export default function thumborLoader({ src, width, quality }) {
const params = [`${width}x0`, `filters:quality(${quality || 75})`]
return `https://example.com${params.join('/')}${src}`
}
Sanity
// Docs: https://www.sanity.io/docs/image-urls
export default function sanityLoader({ src, width, quality }) {
const prj = 'zp7mbokg'
const dataset = 'production'
const url = new URL(`https://cdn.sanity.io/images/${prj}/${dataset}${src}`)
url.searchParams.set('auto', 'format')
url.searchParams.set('fit', 'max')
url.searchParams.set('w', width.toString())
if (quality) {
url.searchParams.set('q', quality.toString())
}
return url.href
}
Sirv
// Docs: https://sirv.com/help/articles/dynamic-imaging/
export default function sirvLoader({ src, width, quality }) {
const url = new URL(`https://example.com${src}`)
const params = url.searchParams
params.set('format', params.getAll('format').join(',') || 'optimal')
params.set('w', params.get('w') || width.toString())
params.set('q', (quality || 85).toString())
return url.href
}
Supabase
// Docs: https://supabase.com/docs/guides/storage/image-transformations#nextjs-loader
export default function supabaseLoader({ src, width, quality }) {
const url = new URL(`https://example.com${src}`)
url.searchParams.set('width', width.toString())
url.searchParams.set('quality', (quality || 75).toString())
return url.href
}
Was this helpful?