PNG to WebP Converter

It does: convert PNG images to WebP in your browser, keeping the alpha channel so transparency is preserved, and show the size saved for each file. It handles batches.

It does not: upload your files, or convert WebP back to PNG. For photographs, the JPG to WebP tool is a better starting point.

PNG is the right format for graphics with sharp edges and transparency - logos, icons, screenshots, illustrations - but the files are often large. WebP was designed to replace it, and for most graphics it produces a visibly identical image at a fraction of the size while keeping transparency intact. Converting your PNGs to WebP is a straightforward page-speed win, and page speed feeds Core Web Vitals, which Google uses as a ranking signal.

WebP supports both lossless and lossy compression as well as an alpha channel, which is what lets it replace PNG without losing transparency. This tool uses the browser's WebP encoder with a quality control: at high settings the result is essentially indistinguishable from the PNG but smaller, and lowering the quality trades a little fidelity for a lot more saving. For flat-colour graphics you can often push the quality down further than you would expect before any difference shows. Because the conversion runs on the canvas in your browser, your images are never uploaded - useful for client logos and unreleased assets.

Browser support for WebP is effectively universal now across current Chrome, Firefox, Safari and Edge, so for most sites you can serve it directly. If you must support very old browsers, the robust pattern is the HTML <picture> element with a WebP source and a PNG fallback, so modern browsers get the small file and old ones still work. After converting, remember to update the references in your pages, and keep the width and height attributes on the image so the browser reserves the right space and avoids layout shift. Convert once, ship lighter pages, and your images stop being the thing that slows everything down.