Image Optimisation Guides

Is WebP open source and royalty-free? The libwebp BSD licence, the additional patent grant, the WebM repository, and what it means for commercial use.

Google PageSpeed flags images that should use next-gen formats. What the warning means, how WebP fixes it, and how to verify the savings.

WebP works on iOS and macOS since Safari 14 and Big Sur (2020). What Safari, Preview, Photos, and Mail support, and older versions.

WebP is not reliably supported in HTML email. Which clients render it, why most do not, and what formats to use for newsletters instead.

The history of WebP — Google's 2010 announcement, lossless and alpha in 2011, animation in 2012, browser adoption, and RFC 9649 in 2024.

Use WebP for web design assets — icons, UI, and transparent backgrounds. When lossless WebP wins, and where SVG is the better choice.

Use WebP for photography portfolios with no visible quality loss. Gallery quality settings, the double-lossy concern, and keeping originals.

Use WebP for e-commerce product images to cut page weight, speed up category pages, and lift conversions with the right quality settings.

Real-world WebP file sizes versus JPG and PNG at 1920×1080. Typical savings, what affects them, and how to benchmark your own images.

How WebP cuts bandwidth and speeds up mobile pages — smaller images, faster LCP on slow networks, and lower data costs for users and your CDN bill.

WebP is deeply supported on Android: Chrome, the OS since Android 4.0, and Google Play. How Android handles WebP and where it is default.

What Stable Diffusion, Midjourney, and DALL·E output, and why converting AI images to WebP cuts their large PNG sizes before publishing.

Photoshop opens and saves WebP natively since version 23.2 (2022). How to open WebP, plus the WebPShop plugin for older versions.

Open .webp files on Windows, macOS, and Linux — native support, built-in viewers, and converting to PNG or JPG when an old app cannot.

WebP is Google's image format with lossy and lossless compression. Learn how it works, browser support, file sizes, transparency, and animation.

WebP supports an 8-bit alpha channel in lossy and lossless modes. How transparency is stored, the ALPH chunk, file-size cost, and PNG comparison.

Use srcset and sizes to serve responsive WebP at the right resolution per device, with a JPEG fallback. Width and density descriptors explained.

How a WebP file is structured: the RIFF container, the WEBP FourCC, and VP8, VP8L, VP8X, ALPH, ANIM and ANMF chunks. The byte layout explained clearly.

Serve WebP with a JPEG or PNG fallback using the HTML picture element. Syntax, source ordering, art direction, and the mistakes to avoid.

Serve WebP automatically in Next.js with the next/image component. Configure formats, sizes, and priority for LCP — no manual conversion.

WebP uses the image/webp MIME type and .webp extension, registered in RFC 9649. How to serve, detect, and configure WebP correctly.

How WebP compresses images: VP8 lossy macroblock prediction and VP8L lossless transforms behind 25–34% smaller files.

Enable automatic WebP conversion on Cloudflare with Polish. How Polish works, lossy vs lossless settings, the WebP toggle, and Image Resizing.

How CDNs serve WebP via Accept-header content negotiation, why Vary: Accept matters for caching, and which CDNs convert images automatically.

Serve WebP from Apache and Nginx by detecting the Accept header and rewriting to .webp files, with the required Vary: Accept header.

Animated WebP stores multi-frame animation with per-frame compression, transparency, and 24-bit colour. How it works and why it beats GIF.

Squoosh is Google's browser-based image compressor. Convert images to WebP, compare formats side by side, and know when to use it vs cwebp.

libwebp is Google's reference WebP library. How to install it, the binaries it ships, and its simple and advanced encode and decode APIs.

AVIF compresses smaller than WebP, but is it replacing it? How the two coexist, where AVIF wins, and why WebP stays the web default.

Compare PNG, JPG, WebP, and AVIF on compression, transparency, animation, and browser support — a framework for choosing the right format.

dwebp is Google's official WebP decoder. Convert WebP to PNG, PPM, or TIFF, and crop, scale, or flip during decoding. Full command reference with examples.

cwebp is Google's official WebP encoder. Reference for quality, lossless, near-lossless, method, presets, resizing, and alpha options.

Convert whole image directories to WebP at scale — shell loops, GNU parallel, Node sharp, ImageMagick, and build-tool pipelines compared.

Add WebP to your WordPress site. Native support, plugin choices, automatic conversion, lazy loading, and serving WebP with fallbacks.

Shopify serves WebP automatically — here's how the CDN works, what theme code you control, and how to optimise product imagery for speed.

Ship WebP in React apps. Next.js Image component, Vite/Webpack pipelines, picture-element patterns, and lazy loading for modern React stacks.

Optimise WebP images for fast page loads. Practical guide to quality settings, responsive delivery, lazy loading, and Core Web Vitals.

Lazy load WebP images correctly. Native attribute, IntersectionObserver, priority hints, and the rules that decide which images should never lazy load.

Master WebP compression settings. Reference for quality, method, near-lossless, alpha, and preset parameters with practical code examples.

Current WebP browser support across desktop and mobile. Compatibility matrix, fallback strategies, and detection methods for production sites.

Choose between lossy and lossless WebP compression. Decision framework, content-type guidance, and visual quality trade-offs for image optimisation.

Practical image SEO. Alt text, file names, structured data, image sitemaps, and the technical details that determine how Google indexes your images.

How images affect Core Web Vitals. Practical fixes for LCP, CLS, and INP regressions caused by images, with measurement tools and benchmarks.

Convert your first image to WebP in three steps with WEBPery. Drag, drop, and download — browser-based, no signup, and no upload required.