Convert JPG to WebP
Same picture, roughly a third fewer bytes. Every browser in current use supports it.
Drop an image here, or click to choose one
You can also paste a screenshot with Ctrl+V. JPG, PNG, WebP.
Every byte of that work happened on your own machine. Verify it: open DevTools → Network, and use the tool. No request carries your image, because none is made.
The straightforward win
WebP does the same job as JPEG with a better algorithm behind it. For equivalent visual quality it typically produces files 25–30% smaller, which on an image-heavy web page is the difference between a fast load and a slow one. Support is no longer a question: every current browser handles it, and has for years.
Where it is still the wrong choice
Upload forms. A great many government portals, HR systems and older web applications accept only JPEG and PNG, and will reject a WebP without explaining why. The saving is not worth a failed submission. Use WebP for websites, apps and anything you control; use JPEG for anything you are handing to a system that has opinions.
Converting an existing JPEG
Worth understanding: converting JPEG to WebP does not undo the compression already applied. The artefacts in your JPEG are now part of the image, and WebP will faithfully preserve them. You get a smaller file of the same picture, not a better one. If you still have the original, converting that directly to WebP gives a cleaner result than going through JPEG first.