WebP vs AVIF vs JPEG - which image format should I use?

For photos on a modern site, WebP is the sensible default - it gives you JPEG-quality images at a much smaller file size, and every current browser supports it. The short version:

• JPEG - universally supported and fine, but the largest of the three for the same quality. The old default.
• WebP - typically 25 to 35% smaller than JPEG at the same quality, supported everywhere that matters. The practical choice today.
• AVIF - smallest files of all, but slower to create and slightly less universal; worth it for image-heavy sites that automate it.

Most page builders and image plugins now convert to WebP automatically, so you often get the benefit just by turning the setting on. Switch your photos to WebP - it is the easiest size saving with no real downside.