Chrome extensions can be so useful, but there's one I used daily that has disappeared. Thankfully, I have already found a workaround.

Change File Extension To easily convert JPEG (or JPG) to PNG, PNG to JPEG, or Google's WebP web file format to JPEG or PNG in Windows, open File Explorer, and make sure the box next to File name ...

A file extension is a suffix that is added to the end of a file name after a dot. It is usually two to four letters long. File extensions help Windows and other operating systems to know the standard ...