Use AVIF Images in your webpage with JPEG Fallback

AVIF is the next big thing in image format. It is a lossy/lossless image format that originates from the video codec AV1. In other words, AVIF to AV1 is like HEIF to HEVC, except AVIF is open, royalty-free, and pushed by a lot of big companies. Just like AV1, AVIF has a bunch of modern features.