WebP images are 25–35% smaller than JPG at the same quality, so web pages load faster.
Add your JPG images above, check that WebP is selected, and click Convert images. Each file downloads as WebP; several files come in one ZIP.
Quality is set to 92% by default, which looks the same as the original. You can raise it to 100%.
No. The conversion happens inside your browser, so your photos never leave your phone or computer.