Things to know about WebP before you vectorise it
WebP is the format many websites now serve in place of JPG and PNG, which is why images saved from a browser so often end up as .webp files. It has two modes. Lossy WebP compresses in a similar way to JPG and can leave soft smudges along sharp edges. Lossless WebP keeps every pixel, much like PNG. Either mode can include an alpha channel for transparency, and the format also supports animation.
Lossy WebP
Look closely at the edges of text and logos. Lossy compression blurs fine lines and shifts colours slightly at boundaries, and the tracer turns those smudges into extra shapes. If the site also offers a PNG or SVG download of the same graphic, that is the better source.
Transparent WebP
The traced paths use solid fills. Semi-transparent areas such as soft shadows or feathered edges do not carry over as partial transparency, so check the result on a coloured background after export.
Animated WebP
The SVG you download is a single still image. Animation is not carried over, so save the frame you want as a still image and upload that.
Images saved from a web page
Sites often serve a scaled-down WebP to save bandwidth. Open the image on its own and check its real dimensions. A 300-pixel thumbnail will not trace as cleanly as the full-size version.