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by NavinF 1007 days ago
Photoshop definitely supports it: 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