Why so many images arrive as WebP
WebP is a format developed by Google to make web images smaller. Sites serve it because it loads faster than JPG at similar quality. When you right-click and save a picture from such a site, you often get a .webp file instead of the .jpg you expected.
Browsers display WebP without trouble, but plenty of other software does not. Older photo editors, some office programs, print services and many upload forms still insist on JPG or PNG. That is where a conversion helps.
Transparent WebP files
WebP can contain transparency, like a PNG. Since JPG cannot, any transparent area is filled with white during conversion. If you need the transparency preserved, convert to PNG instead.
Animated WebP files are a separate case. This tool treats the image as a still picture, so you get a single frame rather than an animation.
Keeping the result sharp
Converting from one lossy format to another stacks compression. To limit the damage, choose a high quality value such as 90 percent. The JPG may then be larger than the original WebP, which is expected, because WebP is more efficient. You can lower the quality afterward if the file needs to be small.
Avoid repeated conversions back and forth. If you still have access to the original source, export from there rather than converting a WebP that came from a JPG in the first place.
Batch jobs and privacy
If you saved a whole set of product pictures or wallpapers, add them all at once. Up to 20 files of 25 MB each can be processed in one go. Nothing is uploaded, and the converted files carry no metadata from the originals.
Opening and sharing WebP files elsewhere
Your browser and most modern phones show WebP without trouble, so the problem usually appears later. You attach the file to an email and the recipient cannot preview it. You drag it into a document and nothing happens. You upload it to a marketplace and get an invalid file type message.
Converting to JPG before you share it removes those surprises. If you will also reduce the size, do it in the same pass: convert first, then use the compressor with a target such as 100 KB. Keep the WebP if you only want to reuse the picture inside another web page, where it is the more efficient choice.
For product photos and wallpapers, 88 to 92 percent is a safe range. For simple web graphics, 80 percent is plenty. Look at the size shown next to each file and adjust until the balance feels right for what you are doing.