WebP to PNG: prepare a reusable copy without claiming an upgrade
A WebP can display perfectly well in a browser while your document workflow asks for PNG. Treat conversion as preparing a copy for that destination, not as proof that one format is always better.
Decoding and saving is not redrawing
A still WebP image can be decoded to PNG. That changes how the image is stored; it does not reconstruct design layers or redraw a logo as vector artwork.
A small source or one with damaged edges is still the available starting point. Seek the original when you need substantial enlargement or detailed editing. PNG cannot discover details that are absent.
References: Google WebP — Decoding a still image to PNG
Check transparency in the destination application
PNG supports optional transparency and lossless storage of its image data. This does not mean every PNG must be transparent, or that white areas in the source will disappear.
Open the output in its destination program on two different backgrounds and inspect the edges. Removing a background that is already drawn into the image is a separate edit, not an automatic result of this conversion.
References: W3C — PNG specification: lossless storage and transparency
Separate display size from file dimensions
A file may have more pixels than its display area in a document. That does not make it vector artwork or permit unlimited enlargement. Keep the source dimensions in your working copy and set the display size for the task.
This is a still-image path, not a way to transfer WebP motion into animated PNG. Retain both source and destination copies with clear names. Do not rely on the conversion to preserve every metadata or archival property.
Example: an icon in a user guide
A 192 × 192-pixel WebP icon is needed as PNG for a guide that displays it 96 pixels wide. There are two source-width pixels per display pixel because 192 ÷ 96 = 2. That ratio is not evidence of newly added detail or unlimited resolution.
Open the PNG inside the guide at its actual display size, then on a dark background if it has transparency. Keep the PNG for the guide and the original for reference if it looks right. If it is blurred, seek a better source rather than repeatedly enlarging the copy.