Why convert JPG to WebP
WebP stores the same picture in roughly 25 to 35 percent fewer bytes than JPEG, which is why nearly every large website now serves it. For images going onto a web page, that saving is worth having: pages load faster, mobile visitors on slow connections stay, and page speed feeds into search ranking. For images going anywhere else, the calculation is different, because compatibility outside browsers is still patchy.
What this conversion costs you
- Generation loss compounds. JPEG has already discarded detail, and re-encoding as WebP discards a little more on top. One pass is nearly invisible; repeatedly converting between lossy formats is not, and the damage cannot be undone.
- Older software may refuse it. Desktop applications and print workflows built before roughly 2020 may not open the file at all.
When not to do this
Do not convert a photograph you intend to keep as your master copy — convert a copy and keep the original. And do not send WebP to a print shop or a government upload form.
Common questions
How much smaller is WebP than JPG?
Typically 25 to 35 percent for the same visual quality, though the exact saving depends heavily on the image. Photographs with lots of fine detail tend to benefit most.
Does converting JPG to WebP reduce quality?
Slightly. Both are lossy, so the re-encode discards a little more detail than JPEG already had. At high quality settings the difference is very hard to see in a single pass.
Should I use WebP for email attachments?
Probably not. Recipients may open attachments in software that cannot read WebP. JPG remains the safer choice for anything leaving a web page.