Active Storage uploads
Request right-sized variants from public blob or CDN-backed URLs without creating new variant records first.
rails image optimization
Optimize Rails and Active Storage images without changing upload workflows
Keep originals in Active Storage, S3, a CMS, or your current public origin. Rails views can request Skymage URLs for exact dimensions, stable crops, WebP or AVIF output, and cached delivery.
# app/helpers/skymage_helper.rb
module SkymageHelper
def skymage_url(source, params = {})
query = Rack::Utils.build_query(params)
"https://demo.skymage.net/v1/#{source}#{query.present? ? "?#{query}" : ""}"
end
end
<%= image_tag skymage_url(product.image_url, w: 520, h: 390, fit: "cover", f: "webp", q: 82),
width: 520,
height: 390,
loading: "lazy",
alt: product.name %>
where it fits
Start with Rails views where images repeat
A useful Rails image optimization test starts with one public route, one repeated image helper or partial, and a measurable surface such as product cards, avatars, gallery images, or CMS media.
Product and listing views
Serve card, gallery, and detail images with explicit width, crop, format, and quality settings.
SaaS and marketplace media
Normalize avatars, screenshots, logos, and user uploads into predictable view sizes.
implementation
Keep URL generation in one Rails helper
A helper or presenter can centralize the Skymage prefix while each ERB, ViewComponent, or partial asks for the dimensions it actually renders.
def product_card_image(product)
skymage_url(product.image_url, {
w: 520,
h: 390,
fit: "cover",
f: "webp",
q: 82
})
end
<%= image_tag product_card_image(product), width: 520, height: 390, loading: "lazy" %>
evaluation path
A practical Rails image CDN test answers four questions
Origin fit
Can Skymage transform the public image paths your Rails app already renders?
View slots
Can each repeated partial request the exact dimensions it displays?
Format output
Can routes ship WebP or AVIF without changing uploads or background jobs?
Rollout risk
Can one helper prove the pattern before changing every image view?
free check
Get a Rails image route audit
Send one public Rails route. The free audit will identify the repeated image surface to test first, the Skymage URL parameters to try, and whether the current origin supports a low-risk rollout.