Convert PNG or JPEG to WebP — smaller than both, at a quality picked per image.

How the WebP is chosen

Two candidates are built for every image and the smaller one wins: the palette image stored losslessly as WebP, and a lossy WebP at the lowest quality that keeps the target. The first usually wins on icons and flat graphics, the second on photographs — and the page does not ask you which kind of image you have.

Both are scored with SSIMULACRA2 as a browser decodes them, so the comparison is against what a visitor will actually see rather than against the encoder's own idea of quality. A JPEG input becomes lossy WebP, turned upright first.

When not to convert

WebP is supported by every browser released since 2020, which covers essentially all traffic — but some desktop software, email clients and design tools still do not read it. If a file is leaving the web, keep the PNG or JPEG. WebP is also capped at 16383 pixels a side, so panoramic images stay as they are.

Converting an already good JPEG to WebP rarely saves much: it lands within about 1% of the JPEG this site would have written. Convert for the format a site asks for, not for the savings.

Questions

Does transparency survive? Yes — WebP carries an alpha channel, and cut-outs keep it.

Is the animation kept? No. Animated PNGs stay on the PNG page; this page writes still WebP only.

How big can an image be? 40 megapixels, and at most 16383 pixels a side.