The content-type HTTP Header will inform the browser which format the URL is in so it can process it appropriately. jpg is this case) may not be the same as the image file format returned (WebP in this example). Note: As the above example shows, the file exension requested (. This URL would retrieve and optimize the image that exists at. For example, you might see a URL that looks like this. This capability is often achieved by including the complete URL of the existing image within the URL for the image generated by the image CDN. Image CDNs can usually be configured to automatically retrieve images from their existing locations when they're needed. The example above uses the image CDN's domain ("") with a personalized subdomain, rather than a custom domain. Using your own domain makes it easier to switch image CDNs at a later date because no URL changes will be needed. Third-party image CDNs typically offer the option of using a custom domain for a fee. OriginĪn image CDN can live on your own domain or the domain of your image CDN. Let's walk through some of the most common features. URL formats will vary depending on image CDN, but at a high-level, they all have similar features. Image URLs used by image CDNs convey important information about an image and the transformations and optimizations that should be applied to it. How image CDNs use URLs to indicate optimization options As a result, CDNs are generally better suited to creating images that are heavily customized for each individual client than build scripts are. Image CDNs are different from build-time image optimization scripts in that they create new versions of images as they're needed. This makes it easy to create variations of an image for different use cases.Įxamples of transformations image CDNs can perform based on parameters in image URLs. For images loaded from an image CDN, an image URL indicates not only which image to load, but also parameters like size, format, and quality. You can also think of them as APIs for accessing and manipulating the images used on your site. Image CDNs specialize in the transformation, optimization, and delivery of images. In theory, it's possible to achieve the same results using only build scripts, but it's rare in practice. Switching to an image CDN can yield a 40–80% savings in image file size. Image content delivery networks (CDNs) are excellent at optimizing images. Twitter GitHub Homepage Why use an image CDN?
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