Image Proxy

Live

img.vappcdn.com

Resize, convert and cache images at the edge, close to your users.

Compatible with wsrv.nl URL parameters

Resize, crop, and format conversion — WebP included.
HMAC-signed URLs, so nobody can turn your proxy into their bandwidth.
Private network ranges are blocked, so the proxy is not a way into your infrastructure.
Origin-agnostic: point it at object storage, your own server, or anything over HTTPS.

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request

elapsed

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dimensions

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size

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cache

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second pass

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cache

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The first pass is the true cost of doing the work. The second is that same URL, served from the edge cache.

Domain setuplive scan

elapsed

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probed

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ns status

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Lookups go through a public recursive resolver. We probe NS, A, AAAA, CNAME, MX and TXT simultaneously.

Usage guide

1 · Resize

One url parameter, then the size. The result is cached at the edge and returned immediately next time.

html<img src="https://img.vappcdn.com/?url=https://example.com/photo.jpg&w=800"
     alt="">

2 · Crop, convert, quality

fit=cover crops to fill; a=attention lets the crop pick the region worth keeping. output and q control format and weight.

urlhttps://img.vappcdn.com/?url=…&w=600&h=400&fit=cover&a=attention&output=webp&q=82

3 · Responsive images with srcset

The browser picks the width it needs. Each variant is its own URL, so it caches indefinitely.

html<img
  src="https://img.vappcdn.com/?url=…&w=800&output=webp"
  srcset="https://img.vappcdn.com/?url=…&w=400&output=webp  400w,
          https://img.vappcdn.com/?url=…&w=800&output=webp  800w,
          https://img.vappcdn.com/?url=…&w=1600&output=webp 1600w"
  sizes="(max-width: 700px) 100vw, 800px" alt="">

4 · The path syntax works too

If your existing code is written in the path style, keep it — change only the hostname.

urlhttps://img.vappcdn.com/cdn-cgi/image/width=800,quality=82,format=auto/https://example.com/photo.jpg

The parameters you will reach for

The full wsrv.nl parameter set and the Cloudflare-style path syntax are both supported. Private network ranges are blocked, so the proxy is not a way into your infrastructure.

name	accepts	notes
w / h	number	Target width and height in pixels.
fit	inside · outside · cover · fill · contain	How the image relates to the box. cover crops to fill; contain pads.
a	position	Crop anchor — the edges, or entropy / attention to let it choose.
dpr	number	Multiplies the size for high-density screens.
output	webp · avif · jpg · png · gif	Output format. Leave it off and the source format is mirrored.
q	1–100	Compression quality.
blur / sharp	number	Blur or sharpen.
filt	greyscale · sepia · negate · duotone	Colour treatment.
mask	shape	Mask to a shape — circle, star, hexagon and others.
ro / flip / flop	orientation	Rotate and mirror.
trim	number	Removes a uniform border.
we	flag	Never enlarge beyond the original.

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