Most people still export to JPEG out of habit. It is the safe default — every browser and every phone understands it. But for the web, two newer formats now beat it comfortably on size, and both are widely supported.
WebP: the easy win
WebP typically lands 25–35% smaller than a JPEG at the same visual quality, and it supports transparency the way PNG does. If you are replacing JPEGs on a website today, WebP is the lowest-risk upgrade you can make.
AVIF: the bigger savings
AVIF pushes further, often halving the JPEG file size while holding detail in gradients and skies that JPEG smears into blocks. It costs more time to encode, which is exactly the kind of work a desktop app should do for you in the background.
SqueezeImages writes all four formats locally, so you can batch a folder to WebP or AVIF without uploading a single file.