RSWebPForge guides
Practical notes for webp converter, including examples and the limits of each workflow.
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Using WebP in a website image workflow
Keep the source as a master and use WebP as a delivery format. This lets you change the export settings later without recompressing an already lossy result.
READ THE GUIDEExporting a transparent WebP
The source needs an alpha channel if you want transparent output. An opaque white rectangle will remain opaque after conversion.