Image optimisation
type: TechArticle
description: Serve images in modern formats (WebP, AVIF), at the right size for the viewport, with explicit dimensions. Images are the largest payload on most pages.
language: en
is part of: Web Specification Studio
author: Web Specification Studio
publisher: Web Specification Studio
license: https://creativecommons.org/licenses/by/4.0/
date modified: 2026-05-29T09:13:20.000Z
citation: MDN — : The Image Embed element
  type: CreativeWork
  publisher: MDN
citation: web.dev — Use modern image formats
  type: CreativeWork
  publisher: web.dev
citation: web.dev — Serve responsive images
  type: CreativeWork
  publisher: web.dev
citation: HTTP Archive — Web Almanac: Media
  type: CreativeWork
  publisher: HTTP Archive

Web Specification Studio
type: WebSite

Web Specification Studio
type: Organization

breadcrumb
type: BreadcrumbList
item list element: Home
  type: ListItem
  position: 1
  item: https://webspecification.com/
item list element: Spec
  type: ListItem
  position: 2
  item: https://webspecification.com/spec/
item list element: Performance
  type: ListItem
  position: 3
  item: https://webspecification.com/spec/performance/
item list element: Image optimisation
  type: ListItem
  position: 4
  item: https://webspecification.com/spec/performance/image-optimization/