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Image Transforms

Resize, crop, and adjust — via URL.

Every image transform is expressed as a URL parameter. No SDK. No build step. Add ?w=800&h=600&fit=cover to any image URL and get the result — cached globally for every subsequent request.

Start transforming images

What's included

  • Resize by width, height, or both with automatic aspect ratio preservation
  • Fit modes: cover, contain, fill, scale-down, crop
  • Blur and sharpen with configurable intensity
  • Quality control for JPEG output (?q=80)
  • DPR support for retina displays (?dpr=2)
  • Sharp, high-quality downscaling at any size
URL params
// Resize to 800×600, crop to fill
cdn.spronta.com/{id}?w=800&h=600&fit=cover

// 400px wide thumbnail, auto height
cdn.spronta.com/{id}?w=400

// Subtle blur for placeholder effect
cdn.spronta.com/{id}?w=40&blur=10

// High-DPR retina image
cdn.spronta.com/{id}?w=400&dpr=2