Ship responsive image variants without rebuilding your media library
Keep originals on your current origin. Use Skymage URLs to request exact mobile, tablet, and desktop image sizes with predictable crops, WebP or AVIF output, and cacheable delivery.
Start with the slots that currently send oversized images
A responsive image CDN rollout should begin where source dimensions and rendered dimensions are far apart: heroes, cards, galleries, and CMS media blocks.
Mobile heroes
Serve narrower WebP or AVIF variants instead of sending desktop-width hero images to mobile users.
Repeated cards
Keep product, article, or listing cards at exact rendered sizes across breakpoints.
CMS uploads
Let editors upload originals while templates request stable responsive variants from the same source path.
url patterns
Make responsive behavior explicit in the image URL
Instead of generating derivative files ahead of time, keep each breakpoint, crop, format, and quality choice visible in a Skymage URL that can be tested on one template first.
Responsive slot
Skymage URL parameters
Mobile hero
?w=720&h=405&fit=cover&f=avif&q=82
Desktop hero
?w=1440&h=810&fit=cover&f=avif&q=84
Article card
?w=480&h=270&fit=cover&f=webp&q=82
Gallery detail
?w=1600&fit=inside&f=avif&q=85
proof path
A useful responsive image test proves four things
Rendered sizes
Map the actual image box sizes on mobile and desktop before choosing widths.
Transfer savings
Compare original bytes against right-sized WebP or AVIF variants.
Visual quality
Check crops, sharpness, and compression on the highest-traffic breakpoint.
Rollout risk
Ship one srcset or component pattern before changing every image template.
free check
Find the first responsive image variant worth testing
Send one public page. The free audit will identify oversized slots, suggested Skymage widths, format choices, and the first responsive URL pattern to try.
