Quick and easy way to batch convert multiple HEIC to png or jpg on macOS?

Is there a quick and easy way to convert many HEIC files to png on macOS? ### Example Suppose we take some live photos on iPhone, airdrop them to MacBook, and we want to upload them to a site that only accepts .png files. I've noticed if you simply change the extension from .HEIC to .png (e.g. in the above image), then as far as I can tell, the image file is treated accordingly by programs and it 'works'. However, I guess the underlying file *hasn't* changed, so it could still contain live photo information (I think), which a normal png wouldn't have, which, in a worst case, could be a security risk or in less severe cases simply be an annoyance. ### What I know so far The best I can do right now is go through the files one by one renaming them. I would really like to know what other solutions are available (via point and click and terminal), and have a strong preference for not having to download any external software.