WebP Compressor

A lossy quality setting between 80% and 85% provides near-lossless visual appearance with up to 60% smaller file sizes than standard JPEG assets.

Because no shipping browser can encode AVIF from a canvas, and everything here runs in your browser. Browsers decode AVIF widely but they do not expose an encoder, so a purely client-side tool cannot produce one without shipping a large WebAssembly encoder and spending significantly more time and memory per image. Worse, when a browser is asked for a format it cannot encode it silently returns a PNG instead — so the honest option today is WebP, which every current browser both encodes and decodes.

Not as WebP, and it is worth knowing why. The WebP format does define a lossless mode, but the browser canvas encoder that runs in your tab does not expose it — asking for maximum quality gets you the best lossy encode, not an exact copy. So if you need pixel-identical output, set the output format to PNG, which is lossless by definition. For screenshots, logos and diagrams that is usually the right call anyway; for photographs, lossy WebP at 80-85 is far smaller and visually indistinguishable.

Rarely. As with JPEG, lossy WebP has already discarded the detail that compression targets, so a second pass costs quality for a modest saving. The exception is a file exported at a needlessly high quality — something saved at 95 will drop to 80 with real savings and little visible change. If the file is already modest, resizing to the dimensions you actually display is the better move.