JPG is accepted almost everywhere, while WebP is not. If you saved a WebP image that your email client, photo editor, document template, print shop or social upload form refuses to open, converting it to JPG solves the problem in seconds. It is also handy when a website saves images as WebP and you want an ordinary file back.
Both formats are lossy, so converting adds a small extra loss; High or Max keeps it hard to see. JPG files are usually somewhat larger than the WebP they came from. JPG cannot store transparency, so transparent areas become white, which suits most photographs and product shots. If you need a see-through background, convert to PNG instead. An animated WebP becomes a still image of its first frame.
Every file keeps its name with only the extension changed, the pixel dimensions stay the same and nothing is added to the output. Select as many WebP files as you like and download them together as one ZIP. All processing runs in your browser, so your images are never uploaded.
Tip: if the image has a transparent background and you want something other than white behind it, convert to PNG and flatten it in an editor first. For ordinary photographs the white fill never shows, and High keeps the result clean.
Many sites serve WebP because it is smaller than JPG, which makes pages load faster. Converting to JPG gives you a version that opens in older software.
They become white, because JPG has no transparency. Choose PNG if you need to keep a transparent background.
No. You get a still JPG from the first frame of the animation.
Usually yes, often by roughly a third at similar quality, because JPG is a less efficient format.
No. The conversion happens in your browser and the files stay on your device.