AVIF AV1 Image File Format
Modern image format built on the AV1 video codec. Alliance for Open Media (Google, Netflix, Apple, Amazon and others), 2019. Royalty-free. ~50% smaller than JPEG at similar quality.
Supports HDR, 12-bit, alpha, animation, film grain synthesis. Browser support: Chrome 85+ (2020), Firefox 93+ (2021), Safari 16+ (2022). Encode is slow (10× JPEG); decode acceptable. libavif + avifenc are reference impl. Cloudflare Images + Vercel Image Optimization serve AVIF automatically. AV1 video is the same codec — the basis for YouTube + Netflix streaming. Competitor: JPEG XL (better features but Chrome dropped support).