Each PNG is opened by your browser and saved as a WebP at the quality on the slider, with its transparent and half-transparent areas kept. The width and height stay the same. Because the WebP is saved with lossy compression, very fine pixel art or tiny text can soften at low settings, so keep the slider high for those.

PNG became the standard for web graphics because it supports transparency, but it never throws away detail, so photo-like PNGs and full screenshots get heavy. WebP supports transparency too and compresses far harder. Swapping the format is one of the easiest ways to speed up a page full of product cut-outs or interface screenshots.

Watch the content type. Smooth photos and soft shadows convert beautifully even at 80. Pixel art, tiny labels and thin lines are the hard case: at low quality the edges blur. Keep the slider at 90 or above for those, or keep them as PNG. To go back to a lossless copy later, WebP to PNG converts the other way, though it cannot restore detail already dropped.

Large graphics also benefit from a smaller pixel size; Resize Image sets an exact width before you convert. If your target does not need transparency at all, PNG to JPG is the most widely accepted option, and photos from a camera can go straight through JPG to WebP.

Chrome, Edge and Firefox save WebP; when a browser cannot, such as some Safari versions, the tool says so instead of saving the wrong file. Conversion runs in your browser on your device, and your images stay there. Free for personal use, no account.