WebP and AVIF are both modern, next-gen image formats designed to reduce file size and improve web performance, but they have some differences:
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WebP is widely supported across most browsers and offers excellent compression with good image quality, making it a popular choice for web images today.
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AVIF is newer and provides even better compression and image quality than WebP, especially for high-resolution images, but it has slightly less browser support currently.
Using both formats together lets you serve AVIF to browsers that support it, and WebP as a fallback, maximizing speed and compatibility.