Photoshop definitely supports it: https://helpx.adobe.com/photoshop/kb/support-webp-image-format.html https://helpx.adobe.com/photoshop/kb/support-webp-image-fo

Photoshop definitely supports it: https://helpx.adobe.com/photoshop/kb/support-webp-image-format.html https://helpx.adobe.com/photoshop/kb/support-webp-image-form... Preview.app is the exception to the rule, but it still has acceptable UX. After you finish drawing the first brush stroke on a WebP file, it will ask you to reopen the edited file as a tiff before you continue editing. No loss of data or functionality