Developer Tools

Image I/O Playground

Test and generate image transformation parameters for Fastly IO, Cloudflare Images, and Pantheon Advanced Global CDN. Upload a local image and experiment with different transformation settings.

Generated Query String

?width=800&height=600&format=webp&quality=75&fit=crop

Parameter Reference

Fastly IO

  • width=N - Target width
  • height=N - Target height
  • format=webp|jpeg|png - Output format
  • quality=1-100 - Quality level
  • fit=crop|contain|cover - Fit mode
  • dpr=1|2|3 - Device pixel ratio

Cloudflare Images

  • w=N - Width
  • h=N - Height
  • format=webp|avif|jpeg - Format
  • quality=1-100 - Quality
  • fit=crop|contain|cover|scale-down|pad
  • gravity=auto|center|face - Crop focus

Pantheon AGCDN

  • w=N - Width
  • h=N - Height
  • fm=webp|jpeg|png - Format
  • q=1-100 - Quality
  • fit=crop|contain - Fit mode
  • crop=center|top|bottom|left|right