Switching JPG photos to WebP is one of the easiest ways to speed up a website. At comparable visual quality, WebP files are typically around a quarter to a third smaller than JPG, which means faster loading, less bandwidth and better scores in page speed tests.
Because both formats are lossy, converting an existing JPG adds a second round of compression. Use High, the default, or Max to keep the result visually identical for most photos, and keep your original JPGs as masters. If an image looks soft at a lower setting, step up one level. JPG has no transparency, so there is nothing to preserve there and the WebP is fully opaque.
WebP works in all current browsers, but some email clients, older editors and print services still expect JPG, so keep JPG for those. Each file keeps its name with only the extension changed, dimensions are unchanged and no metadata is written. Convert a whole folder at once and download one ZIP, all in your browser.
Tip for photographers and site owners: convert copies, not originals. Compare one converted image against its JPG at full size, pick the lowest setting that still looks right, then apply it to the whole batch so every file is treated the same.
Typically around 25 to 35 percent smaller at similar visual quality, though it varies from image to image.
A little, since both formats are lossy. At High or Max the difference is rarely visible. Keep your original JPGs in case you need them later.
No. The WebP contains only the image, so EXIF details such as camera model and GPS location are not copied. That is useful when you publish photos online.
On the web, yes. In older software, some email clients and certain print services, JPG is still the safer choice.
No. The conversion runs in your browser and your photos stay on your device.