Tools · Updated 16 Oct, 09:42 pm IST

Analysis: JPEG XL vs AVIF for web images

Why it matters for readers: If you care about faster pages and smaller downloads, this shows when AVIF or JPEG XL is better.

For lossy photos on the web, AVIF almost always produces smaller files than JPEG XL, with JPEG XL typically 15–25% larger at default effort settings.1
At maximum effort settings the size gap narrows, with JPEG XL typically 6–20% larger than AVIF, and there are outliers where JPEG XL can match or beat AVIF.1
The JPEG XL encoder matters: the newer jixel encoder usually produces smaller files than libjxl, except for images with detailed transparency.1
For screenshots and illustrations, AVIF is much better than JPEG XL, with JPEG XL being 30–90% larger at default effort and 20–70% larger at maximum effort.1
For images with transparency, AVIF outperforms JPEG XL, with libjxl versions 31–44% larger at default effort and 61–70% larger at maximum effort.1

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