Turn heavy PNGs into light WebP files. For photos and screenshots headed to a website, this is often the conversion that pays off most.
PNG is lossless, which keeps screenshots and graphics exact but makes photographs and large images heavy. WebP was designed for the web and generally stores the same picture in far fewer bytes, and every current major browser displays it. For images you publish yourself — blog illustrations, product photos, screenshots in documentation — converting PNG to WebP is one of the simplest ways to make pages lighter and faster.
WebP as a format can store transparency, but this converter does not keep it. When the output is WebP, transparent areas are filled with white before encoding. That makes no difference for screenshots and photos that happened to be saved as PNG, but a logo, icon or cut-out product on a see-through background will come out on a white box. If transparency matters, keep the image as a PNG; the Compress tool can shrink a PNG while keeping it a PNG, transparency included.
The WebP is lossy, at the quality you pick: Smaller (62), Recommended (82), High (94), or 40 to 100 on the slider. Photographs usually look indistinguishable at Recommended. Screenshots with small text and flat-colour graphics show compression more readily, so use High for those, and compare with the original in the preview. Encoding happens in your browser: Chrome, Edge and Firefox write WebP, while Safari falls back to PNG and the file name follows the real format. The result list shows old and new sizes for every file.
Everything runs inside your browser. Because the image never reaches a server, we cannot store it or look at it. That difference matters when the file is company material or a personal photo.