Stack0
Use Cases/CDN

Perfect images at every size

Resize, crop, and convert images on-the-fly via URL transforms. WebP, AVIF, and automatic format selection. Cached globally for instant delivery.

WebPAVIFSmart CropGlobal CDN
Start Optimizing ImagesView Docs
import { Stack0 } from '@stack0/sdk'
 
const stack0 = new Stack0({ apiKey: process.env.STACK0_API_KEY })
 
// Upload an image
const { url } = await stack0.cdn.upload({
  file: imageFile,
  folder: 'products',
})
 
// Transform via URL parameters
const thumbnail = `${url}?width=200&height=200&fit=cover`
const webp = `${url}?format=webp&quality=80`
 
// Or use the SDK for programmatic transforms
const optimized = stack0.cdn.transform(url, {
  width: 1200,
  height: 630,
  fit: 'cover',
  format: 'webp',
  quality: 85,
})

Features

What's included

Resize & Crop

Width, height, fit modes. Cover, contain, fill, and smart crop options.

Format Conversion

WebP, AVIF, PNG, JPEG. Auto-select best format for each browser.

Quality Control

Balance quality and file size. Compression you can fine-tune.

Effects

Blur, sharpen, grayscale, and more. Image effects via URL.

Global Cache

Transforms cached at 200+ edge locations. Fast everywhere.

Instant Processing

First request transforms in milliseconds. Subsequent requests served from cache.

Why Stack0

Built for production

URL transforms

Add parameters to any image URL. No preprocessing or build steps required.

Modern formats

Automatic WebP and AVIF conversion. Smaller files, faster loads.

Global CDN

Transformed images cached at edge locations worldwide. Sub-100ms delivery.

Responsive images

Generate srcset variants on demand. Perfect images for every device.

Smart cropping

Face detection and smart crop for thumbnails that focus on what matters.

Simple pricing

$0.50 per 1,000 transforms. Cached results served free.

Applications

Common implementations

Responsive Images

Serve perfectly sized images for mobile, tablet, and desktop.

Thumbnails

Generate product thumbnails, avatars, and gallery previews on demand.

Social Sharing

Create properly sized images for Twitter, Facebook, and LinkedIn.

E-commerce

Product images optimized for listings, detail pages, and zoom views.

FAQ

Frequently asked questions

Stack0 CDN supports JPEG, PNG, GIF, WebP, AVIF, and SVG. You can convert between formats on-the-fly using the format parameter. Use format=auto to let us serve the best format for each browser.

Transformed images are cached at 200+ edge locations worldwide. The first request generates the transform, then subsequent requests are served from cache with sub-100ms latency. Cache invalidation is automatic when you update the source image.

The maximum file size is 100MB per image. For optimal performance, we recommend keeping source images under 20MB. There's no limit on the number of images you can upload.

Yes, use fit=cover with gravity=auto to enable face detection and smart cropping. The system automatically detects faces and important objects, ensuring they stay in frame when cropping.

You pay $0.50 per 1,000 transforms. A transform is any unique combination of URL parameters. Cached results don't count as new transforms - you only pay for unique transformations.

Ready to build?

Plans start at $5/month.

Get Started