![]() ImageMagick is the most popular command line tool for creating and editing images. Regardless of the approach that you choose, you may find it helpful to use ImageMagick to resize your images. Responsive image techniques, specifically srcset and sizes, allow you to specify multiple image versions and for the device to choose the size that works best for it. Responsive image techniques make this possible by allowing you to list multiple image versions and for the device to choose the image that works best for it.Īn image that works across all devices will be unnecessarily large for smaller devices. Some sites find that this difference in image quality matters, some find that it does not. All other things being equal, a high pixel density display will look sharper than a low pixel density display.Īs a result, multiple image versions are necessary if you want users to experience the crispest possible images, regardless of the pixel density of their device. "Display density" refers to the fact that different displays have different densities of pixels. The "Better" approach #įor images with both absolute and relative sizing, use srcset and sizes attributes to serve different images to different display densities. The DevTools Elements panel can be used to determine what size an image is displayed at. Absolute units: Resize the image to match the size that it is displayed at.Alternatively, screensiz.es provides information about the displays of many common devices. Google Analytics) to see which display sizes are commonly used by your users. You may find it helpful to check your analytics data (e.g. Relative units: Resize the image to a size that will work across all devices.Examples of valid, relative CSS units: %, vw (1vw = 1% of the width of the viewport), em (1.5 em = 1.5 times font size). Relative units: Elements styled using relative units will be displayed at varying sizes, depending on the relative length specified.Examples of valid, absolute CSS units: px, cm, mm, in. Absolute units: Elements styled using absolute units will always be displayed at the same size, regardless of device.There are two types of CSS units for specifying the size of HTML elements, including images: The best choice for you is the one that you feel comfortable implementing. However, it will also reward you with bigger performance improvements. For this reason, we've provided two approaches: the "good" and the "better." Both will improve performance, but the "better" approach may take a bit longer to understand and implement. Image sizing can be deceptively complicated. The audit lists any images that need to be resized. ![]() Run the Performance Audit ( Lighthouse > Options > Performance) and look for the results of the Properly size images audit. Lighthouse makes it easy to identify incorrectly-sized images. ![]() The image looks fine, but it is wasting users' data and hurting page performance. We've all been there: you forgot to scale down an image before adding it to the page.
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