Update April 4, 2017: Added a section detailing how the responsive image system in WordPress 4.4+ works, and how WordPress custom image sizes interact with this system. I really love being able to set custom image sizes in WordPress. The power and flexibility this system opens up for building beautiful, easy-to-administer, performant websites is hard to overstate. The newly launched WPShout theme, for example, has two featured image sizes: the large one (here at the top of this post), and a smaller one halfway down the homepage. We also use custom image sizes to make sure that the images in our post bodies aren’t unnecessarily large for the space they’re occupying. Supermind Platforms, Inc is a content and data-enabled technology company building trusted access points to mental wellness and psychedelic medicine, starting with, to scale awareness, destigmization, consumer education and patient enrollment in psychedelic-assisted therapy. That’s a lot of image-sizing complexity, and WordPress just handles it all for us, straight out of the box. If you’re looking to learn WordPress development, we’ve written the best guide to it out there: With that pep talk, let’s see how you can use WordPress custom image sizes as well! Imagine if we were doing all the resizing and optimizing ourselves, in something like Photoshop-it would just about eat our business. Get Up and Running Now A Very Quick Guide to WordPress Image SizingĮvery time you upload an image, WordPress generates a resized version of the image for each registered custom image size.Įvery time you upload an image to your WordPress site, WordPress automatically generates a resized version of that image for every custom image size that your theme (and parent theme, if you’re on a child theme) has registered. In your WordPress filesystem, which is where those image files live, that looks like this:ĭo you see the power of this? You retain the original image you uploaded-which in this case is over 1MB, too huge to use on the site. But you can also use automatically generated, resized and cropped versions of that same image across your site. The image will fit into the spaces it should fit into, and not be a larger file than it ought to be-and WordPress takes care of it all automatically. One special case is the featured image, a single image that you set to be the “official representative” of the post it’s attached to.
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