WebP is a modern image format developed by Google that provides superior compression for images displayed on the web, producing smaller file sizes than traditional formats like JPEG and PNG while maintaining comparable or better visual quality.
Introduced by Google in 2010, WebP was designed to address a fundamental challenge in web performance: images are typically the largest assets on a webpage, and reducing their file size directly improves page load times. WebP achieves this through advanced compression algorithms derived from the VP8 video codec. For photographs and complex imagery, it uses lossy compression, similar to JPEG, but typically produces files 25 to 35 percent smaller at equivalent quality. For graphics, logos, and images requiring transparency, it supports lossless compression, where it can outperform PNG by a significant margin.
One of WebP's most practical advantages over older formats is its native support for transparency (also called an alpha channel) alongside lossy compression. JPEG, by contrast, cannot store transparent areas at all, forcing developers to use PNG for such images despite the larger file sizes that come with it. WebP eliminates this trade-off by combining small file sizes with full transparency support in a single format.
WebP also supports animated images, functioning as a more efficient alternative to the GIF format. Animated WebP files are substantially smaller than equivalent GIFs while supporting a much wider range of colors and better compression.
WebP and Web Performance
From an SEO and performance perspective, serving WebP images is one of the more straightforward ways to reduce page weight and improve Core Web Vitals scores, particularly the Largest Contentful Paint (LCP) metric, which measures how quickly the main visual content of a page loads. Search engines, including Google, factor page speed into rankings, making image format choices a tangible part of technical SEO.
Browser support for WebP is now effectively universal among modern browsers, including Chrome, Firefox, Safari, and Edge. For the small number of legacy environments that do not support it, developers commonly use the HTML picture element to serve WebP to compatible browsers while falling back to JPEG or PNG for others.
WebP vs. Newer Formats
While WebP remains widely adopted, newer formats such as AVIF and JPEG XL have emerged offering even greater compression efficiency. AVIF in particular is gaining traction as a next-generation alternative. However, WebP's near-universal browser support and well-established tooling make it the practical standard for most web projects today. Many content management systems and image optimization services convert uploads to WebP automatically, making adoption straightforward for developers and content teams alike.