Convert HEIC to WebP

No. A visible quality loss is not inevitable with WebP, but the result still depends on how the image is encoded. The conversion is mainly useful for compatibility and file-size goals, so keep the original HEIC as the master if you need to avoid any generation loss.

Yes. WebP supports an alpha channel, so transparent areas can remain transparent when the source contains them. That makes it more flexible than JPG for logos and cutouts while still being suitable for compact web delivery.

Different images compress differently, so changing the file extension does not guarantee a smaller result. Photos, screenshots, and flat graphics have different compression patterns. Compare the actual output size and quality rather than assuming WebP will win for every source image.

No. WebP is common on the modern web, but an individual website or upload form can still restrict accepted formats. Check the receiving system first. If it only lists JPG or PNG, convert to the format it explicitly accepts instead.

Use WebP when you want a web-oriented image format that can combine compact files with transparency support. Keep HEIC when the receiving software already handles it well. The strongest reason to convert is a real compatibility or size requirement in the next workflow.