Going from compressed to uncompressed is lossless in most cases, but compressed to compressed is ALWAYS lossy. Even with an intermediary compressed -> uncompressed -> compressed theres usually a noticeable amount of loss.
You are saying that you use an extension to convert from WebP to PNG, right? PNG is a lossless file format. It’s compressed, but losslessly. Like zip is also lossless compression. You can remove information to make it more compressible and then it’s a lossy process, but that’s not because of PNG, but because of the specific workflow.
Going from compressed to uncompressed is lossless in most cases, but compressed to compressed is ALWAYS lossy. Even with an intermediary compressed -> uncompressed -> compressed theres usually a noticeable amount of loss.
You are saying that you use an extension to convert from WebP to PNG, right? PNG is a lossless file format. It’s compressed, but losslessly. Like zip is also lossless compression. You can remove information to make it more compressible and then it’s a lossy process, but that’s not because of PNG, but because of the specific workflow.
I said the conversion in this specific use case causes loss, it does. End of story.