Netlify Image CDN

Every Netlify site has a built-in /.netlify/images endpoint for on-the-fly image transformation. No configuration required for local images.

Basic Usage

<img src="/.netlify/images?url=/photo.jpg&w=800&h=600&fit=cover&q=80" />

Query Parameters

Param	Description	Values
url	Source image path (required)	Relative path or absolute URL
w	Width in pixels	Any positive integer
h	Height in pixels	Any positive integer
fit	Resize behavior	contain (default), cover, fill
position	Crop alignment (with cover)	center (default), top, bottom, left, right
fm	Output format	avif, webp, jpg, png, gif, blurhash
q	Quality (lossy formats)	1-100 (default: 75)

When fm is omitted, Netlify auto-negotiates the best format based on browser support (preferring webp, then avif).

Remote Image Allowlisting

External images must be explicitly allowed in netlify.toml:

[images]
remote_images = ["https://example\\.com/.*", "https://cdn\\.images\\.com/.*"]

Values are regex patterns.

Clean URL Rewrites

Create user-friendly image URLs with redirects:

# Basic optimization
[[redirects]]
from = "/img/*"
to = "/.netlify/images?url=/:splat"
status = 200

# Preset: thumbnail
[[redirects]]
from = "/img/thumb/:key"
to = "/.netlify/images?url=/uploads/:key&w=150&h=150&fit=cover"
status = 200

# Preset: hero
[[redirects]]
from = "/img/hero/:key"
to = "/.netlify/images?url=/uploads/:key&w=1200&h=675&fit=cover"
status = 200

Caching

• Transformed images are cached at the CDN edge automatically
• Cache invalidates on new deploys
• Set cache headers on source images to control caching:

[[headers]]
for = "/uploads/*"
[headers.values]
Cache-Control = "public, max-age=31536000, immutable"

User-Uploaded Images

Combine Netlify Functions (upload handler) + Netlify Blobs (storage) + Image CDN (serving/transforming) to build a complete user-uploaded image pipeline. See references/user-uploads.md for the full pattern.