Why WebP Photos Are Usually Smaller Than JPG at the Same Quality

JPG is a genuinely old format

JPG's compression approach dates back to the early 1990s, built on the image-compression research and computing constraints of that era. It has remained the dominant photo format for decades mostly due to sheer universal compatibility, not because its compression technique is still the most efficient available.

What WebP changed

WebP, developed decades later, builds on more advanced compression techniques — borrowed partly from video-codec research — that more effectively predict and encode the kind of visual patterns found in real photos. The practical result across most real-world photos is a smaller file size than an equivalent-quality JPG.

How much smaller, roughly

The exact savings vary by image content, but WebP files at visually comparable quality to a JPG are commonly noticeably smaller — often estimated in the range of 25-35% smaller for typical photographic content, though this varies significantly depending on the specific image.

Why this matters beyond just storage space

Smaller image files mean faster-loading web pages, which affects both user experience and, for websites, search ranking factors that account for page load speed. Re-encoding existing JPG photos as WebP is a common, low-effort way to shrink a website's total image weight.

Try it yourself

Our JPG to WebP converter re-encodes your photo in your browser, so you can compare the resulting file size for yourself.