In most cases, we recommend using the className prop.Use className or style, not styled-jsx.Styling the Image component is similar to styling a normal element, but there are a few guidelines to keep in mind: If none of the suggested methods works for sizing your images, the next/image component is designed to work well on a page alongside standard elements. If your application is retrieving image URLs using an API call (such as to a CMS), you may be able to modify the API call to return the image dimensions along with the URL. If you're serving images from a source that you control, consider modifying your image pipeline to normalize the images to a specific size. You can also use object-fit with fill, contain, or cover, and object-position to define how the image should occupy that space. Consider using CSS to give the image's parent element space on the page along sizes prop to match any media query break points. The fill prop allows your image to be sized by its parent element. If you are accessing images from a source without knowledge of the images' sizes, there are several things you can do: What if I don't know the size of my images? Implicitly, by using fill which causes the image to expand to fill its parent element.Explicitly, by including a width and height property.This allows the browser to reserve precisely enough space for the image before it loads.īecause next/image is designed to guarantee good performance results, it cannot be used in a way that will contribute to layout shift, and must be sized in one of three ways: The way to avoid image-based layout shifts is to always size your images. This performance problem is so annoying to users that it has its own Core Web Vital, called Cumulative Layout Shift. One of the ways that images most commonly hurt performance is through layout shift, where the image pushes other elements around on the page as it loads in. See more about priority in the next/image component documentation. Java is a registered trademark of Oracle and/or its affiliates.Module. For details, see the Google Developers Site Policies. Lighthouse will list any images that are not being served inĮxcept as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. Performance) and look for the results of the Serve images in next-genįormats audit. Run the Lighthouse Performance Audit ( Lighthouse > Options > Lighthouse can be used to verify that all images on your site are being served This will allow you to use image markup similar to the following with automatic WebP support: If a WebP alternate is found, it will be served with the proper Content-Type header. The rewrite rule above will look for a WebP version of any requested JPEG or PNG image. If you go this route, you'll need to set the HTTP Vary response header to ensure caches will understand that the image may be served with varying content types: Which level is the right tradeoff between image quality and filesize for yourĬonvert a single file, using cwebp's default compression settings: cwebp images/flower.jpg -o images/flower.webpĬonvert a single file, using a quality level of 50: cwebp -q 50 images/flower.jpg -o images/flower.webpĬonvert all files in a directory: for file in images/* do cwebp "$file" -o "$/$1.webp -f It's worth playing around with this, find When you convert images to WebP, you have the option to set a wide variety ofĬompression settings-but for most people the only thing you'll ever need toĬare about is the quality setting. Webpack or Gulp), whereas the CLI is a good choiceįor simple projects or if you'll only need to convert images once. The Imagemin WebP plugin is generally the best choice if your project uses build People generally use one of the following approaches for converting their images Lossy compression reduces file size, but at the expense of possibly WebP offers both lossless and lossy compression. WebP is an excellent replacement for JPEG, PNG, and GIF images.
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