In this article: What AVIF actually is, who built it, what problem it solves Why the same image is ~50% smaller than JPEG and ~20% smaller than WebP at equivalent quality When AVIF is the right call — and when it isn't 2026 browser support: is it finally safe to use everywhere? Let me start with one number. The same 1920×1080 photo, encoded at the quality where the human eye can't tell them apart: JPEG at q75: 263 KB WebP at q75: 168 KB AVIF at q50: 102 KB Three formats. Same image. Same perceived quality. The AVIF version is less than 40% the size of JPEG . That single number is why we're having this conversation in 2026. But "use AVIF" is the easy answer. The harder, more useful one is when to use it — and when not to. That's what this guide covers. What Is AVIF, Briefly AVIF stands for AV1 Image File Format . It was released in 2019 by the Alliance for Open Media , a consortium of companies that wanted a royalty-free, open-source image compression standard.…