"on the fly clientside image to webp converter...but png's are not transparent" Code Answer
Answers related to “on the fly clientside image to webp converter...but png's are not transparent”
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canvas status
this is an known issue with chrome.
from the comments from the link above it's stated:
the issue has currently not been solved but will likely be addressed in near future.
possible work-around
for a possible work-around you can use a custom implementation of the webp format which states it supports the alpha channel. it can convert png (and jpeg) to webp format.
the solution is called webpjs and can be found here (and examples can be found here).
(but there is also the possibility that chrome won't be able to decode webp images even if they contain alpha channel..).
conclusion
webp images with alpha channel has poor support at the moment even with google's (the inventor) own chrome, and lack support in other browsers. my advice is that you put this on ice until support is improved and instead use png as this has wide support.
use tools such as tinypng.com to reduce the sizes of the files.