@unpic/astro

A high-performance, responsive image service and component library for Astro. Generates a responsive <img> tag that follows best practices, with the correct srcset, sizes and styles. Detects image URLs from most image CDNs and CMSs and can resize images with no build step.

@unpic/astro has two parts, which can be used independently but work best together:

• A component library which provides a <Image> component and a <Source> component for art direction.
• An Astro image service, which allows you to use the regular Astro Image component unchanged, and have it automatically generate the correct srcset and attributes for all images.

Features

• Just an <img> tag! No extra elements, no runtime JavaScript. Easy to style.
• Automatically generates correct srcset and sizes attributes for responsive images
• Handles responsive resizing of images, preserving aspect ratio
• Uses native lazy loading and aync decoding for offscreen images
• Handles different image layouts: fixed, constrained and full width
• Uses eager loading and high priority fetching for important images
• Delivers modern image formats, including WebP and AVIF if supported by your browser
• No built step or server-side rendering required: uses your existing image CDN or CMS, with no additional configuration
• Supports most image CDNs and headless CMSs, including Cloudinary, Contentful, Imgix, and Shopify
• Generates image placeholders to display while images are loading.

Installation and usage

npm install @unpic/astro

---
import { Image } from "@unpic/astro";
---

<Image
  src="https://cdn.shopify.com/static/sample-images/bath_gcrop_center.jpeg"
  layout="constrained"
  width={800}
  height={600}
  alt="A lovely bath"
/>

For the supported props, see the docs.