WebP is already an efficient modern format, but exported WebP files are often encoded conservatively and still have room to shrink. Compresso re-encodes them at the sweet spot between size and fidelity, then verifies the result so the image you download looks exactly like the one you uploaded.
This is ideal for web performance: smaller WebP means faster Core Web Vitals and less bandwidth, with no visible quality cost. If a smaller version can't be produced without crossing the visual line, the original is returned unchanged — you never lose.
Drop up to 20 WebP files, see the savings per file, and download individually or as a ZIP. Processing happens in memory and files are deleted instantly.